This semi-annual shareholder report contains important information about the Calvert High Yield Bond Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 51

$ 475,308,411

16.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.5%
Senior Floating-Rate Loans	6.9%
Short-Term Investments	10.2%
Corporate Bonds	81.4%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of total investments)^{Footnote Referencea}

Value	Value
Not Rated	1.6%
CCC or Lower	13.3%
B	36.5%
BB	45.9%
BBB	2.7%

Footnote

Description

Footnote^a

Excludes Short-Term Investments. Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). This breakdown assigns a numeric equivalent to the ratings from the aforementioned agencies and the mean is rounded to the nearest integer and converted to an equivalent S&P rating ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class C

This semi-annual shareholder report contains important information about the Calvert High Yield Bond Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 88

$ 475,308,411

16.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.5%
Senior Floating-Rate Loans	6.9%
Short-Term Investments	10.2%
Corporate Bonds	81.4%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of total investments)^{Footnote Referencea}

Value	Value
Not Rated	1.6%
CCC or Lower	13.3%
B	36.5%
BB	45.9%
BBB	2.7%

Footnote

Description

Footnote^a

Excludes Short-Term Investments. Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). This breakdown assigns a numeric equivalent to the ratings from the aforementioned agencies and the mean is rounded to the nearest integer and converted to an equivalent S&P rating ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class I

This semi-annual shareholder report contains important information about the Calvert High Yield Bond Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 38

$ 475,308,411

16.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.5%
Senior Floating-Rate Loans	6.9%
Short-Term Investments	10.2%
Corporate Bonds	81.4%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of total investments)^{Footnote Referencea}

Value	Value
Not Rated	1.6%
CCC or Lower	13.3%
B	36.5%
BB	45.9%
BBB	2.7%

Footnote

Description

Footnote^a

Excludes Short-Term Investments. Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). This breakdown assigns a numeric equivalent to the ratings from the aforementioned agencies and the mean is rounded to the nearest integer and converted to an equivalent S&P rating ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class R6

This semi-annual shareholder report contains important information about the Calvert High Yield Bond Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 35

$ 475,308,411

16.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.5%
Senior Floating-Rate Loans	6.9%
Short-Term Investments	10.2%
Corporate Bonds	81.4%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of total investments)^{Footnote Referencea}

Value	Value
Not Rated	1.6%
CCC or Lower	13.3%
B	36.5%
BB	45.9%
BBB	2.7%

Footnote

Description

Footnote^a

Excludes Short-Term Investments. Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”). This breakdown assigns a numeric equivalent to the ratings from the aforementioned agencies and the mean is rounded to the nearest integer and converted to an equivalent S&P rating ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class A

This semi-annual shareholder report contains important information about the Calvert Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 44

$ 1,001,457,153

153.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.6%
U.S. Treasury Obligations	1.1%
Mutual Funds	1.3%
Commercial Mortgage-Backed Securities	4.4%
Senior Floating-Rate Loans	5.2%
Collateralized Mortgage Obligations	5.8%
Asset-Backed Securities	9.2%
U.S. Government Agency Mortgage-Backed Securities	11.4%
Short-Term Investments	15.6%
Corporate Bonds	44.4%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash & Equivalents	2.0%
Not Rated	9.4%
CCC or Lower	1.7%
B	5.9%
BB	8.6%
BBB	38.7%
A	13.1%
AA	4.1%
AAA	16.5%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class C

This semi-annual shareholder report contains important information about the Calvert Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 82

$ 1,001,457,153

153.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.6%
U.S. Treasury Obligations	1.1%
Mutual Funds	1.3%
Commercial Mortgage-Backed Securities	4.4%
Senior Floating-Rate Loans	5.2%
Collateralized Mortgage Obligations	5.8%
Asset-Backed Securities	9.2%
U.S. Government Agency Mortgage-Backed Securities	11.4%
Short-Term Investments	15.6%
Corporate Bonds	44.4%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash & Equivalents	2.0%
Not Rated	9.4%
CCC or Lower	1.7%
B	5.9%
BB	8.6%
BBB	38.7%
A	13.1%
AA	4.1%
AAA	16.5%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class I

This semi-annual shareholder report contains important information about the Calvert Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 32

$ 1,001,457,153

153.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.6%
U.S. Treasury Obligations	1.1%
Mutual Funds	1.3%
Commercial Mortgage-Backed Securities	4.4%
Senior Floating-Rate Loans	5.2%
Collateralized Mortgage Obligations	5.8%
Asset-Backed Securities	9.2%
U.S. Government Agency Mortgage-Backed Securities	11.4%
Short-Term Investments	15.6%
Corporate Bonds	44.4%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash & Equivalents	2.0%
Not Rated	9.4%
CCC or Lower	1.7%
B	5.9%
BB	8.6%
BBB	38.7%
A	13.1%
AA	4.1%
AAA	16.5%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class R6

This semi-annual shareholder report contains important information about the Calvert Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 28

$ 1,001,457,153

153.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.6%
U.S. Treasury Obligations	1.1%
Mutual Funds	1.3%
Commercial Mortgage-Backed Securities	4.4%
Senior Floating-Rate Loans	5.2%
Collateralized Mortgage Obligations	5.8%
Asset-Backed Securities	9.2%
U.S. Government Agency Mortgage-Backed Securities	11.4%
Short-Term Investments	15.6%
Corporate Bonds	44.4%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash & Equivalents	2.0%
Not Rated	9.4%
CCC or Lower	1.7%
B	5.9%
BB	8.6%
BBB	38.7%
A	13.1%
AA	4.1%
AAA	16.5%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class A

This semi-annual shareholder report contains important information about the Calvert Core Bond Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 36

$ 1,129,500,802

223.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.1%
Collateralized Mortgage Obligations	3.1%
Commercial Mortgage-Backed Securities	9.8%
Short-Term Investments	12.3%
Asset-Backed Securities	13.0%
U.S. Treasury Obligations	14.6%
U.S. Government Agency Mortgage-Backed Securities	22.3%
Corporate Bonds	23.8%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash and Equivalents	(0.1%)
Not Rated	1.0%
B	0.5%
BB	0.4%
BBB	16.3%
A	15.9%
AA	7.2%
AAA	58.8%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class I

This semi-annual shareholder report contains important information about the Calvert Core Bond Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 23

$ 1,129,500,802

223.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.1%
Collateralized Mortgage Obligations	3.1%
Commercial Mortgage-Backed Securities	9.8%
Short-Term Investments	12.3%
Asset-Backed Securities	13.0%
U.S. Treasury Obligations	14.6%
U.S. Government Agency Mortgage-Backed Securities	22.3%
Corporate Bonds	23.8%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash and Equivalents	(0.1%)
Not Rated	1.0%
B	0.5%
BB	0.4%
BBB	16.3%
A	15.9%
AA	7.2%
AAA	58.8%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class R6

This semi-annual shareholder report contains important information about the Calvert Core Bond Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 22

$ 1,129,500,802

223.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	1.1%
Collateralized Mortgage Obligations	3.1%
Commercial Mortgage-Backed Securities	9.8%
Short-Term Investments	12.3%
Asset-Backed Securities	13.0%
U.S. Treasury Obligations	14.6%
U.S. Government Agency Mortgage-Backed Securities	22.3%
Corporate Bonds	23.8%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash and Equivalents	(0.1%)
Not Rated	1.0%
B	0.5%
BB	0.4%
BBB	16.3%
A	15.9%
AA	7.2%
AAA	58.8%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class A

This semi-annual shareholder report contains important information about the Calvert Mortgage Access Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 107

$ 79,725,344

141.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.9%
Short-Term Investments	0.4%
Government National Mortgage Association Participation Agreements	2.1%
U.S. Government Agency Mortgage-Backed Securities	47.5%
Collateralized Mortgage Obligations	49.1%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of total investments)^{Footnote Referencea}

Value	Value
B	5.8%
BB	1.0%
BBB	2.7%
A	8.0%
AA	2.0%
AAA	80.5%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Agency, LLC ("Kroll") for securitized debt instruments only (such as asset-backed and mortgage-backed securities), or if unrated, considered to be of comparable credit quality by the Fund’s investment adviser. If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality.

1-800-368-2745

Class C

This semi-annual shareholder report contains important information about the Calvert Mortgage Access Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 144

$ 79,725,344

141.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.9%
Short-Term Investments	0.4%
Government National Mortgage Association Participation Agreements	2.1%
U.S. Government Agency Mortgage-Backed Securities	47.5%
Collateralized Mortgage Obligations	49.1%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of total investments)^{Footnote Referencea}

Value	Value
B	5.8%
BB	1.0%
BBB	2.7%
A	8.0%
AA	2.0%
AAA	80.5%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Agency, LLC ("Kroll") for securitized debt instruments only (such as asset-backed and mortgage-backed securities), or if unrated, considered to be of comparable credit quality by the Fund’s investment adviser. If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality.

1-800-368-2745

Class I

This semi-annual shareholder report contains important information about the Calvert Mortgage Access Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 95

$ 79,725,344

141.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.9%
Short-Term Investments	0.4%
Government National Mortgage Association Participation Agreements	2.1%
U.S. Government Agency Mortgage-Backed Securities	47.5%
Collateralized Mortgage Obligations	49.1%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of total investments)^{Footnote Referencea}

Value	Value
B	5.8%
BB	1.0%
BBB	2.7%
A	8.0%
AA	2.0%
AAA	80.5%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Agency, LLC ("Kroll") for securitized debt instruments only (such as asset-backed and mortgage-backed securities), or if unrated, considered to be of comparable credit quality by the Fund’s investment adviser. If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality.

1-800-368-2745

Class R6

This semi-annual shareholder report contains important information about the Calvert Mortgage Access Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 95

$ 79,725,344

141.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.9%
Short-Term Investments	0.4%
Government National Mortgage Association Participation Agreements	2.1%
U.S. Government Agency Mortgage-Backed Securities	47.5%
Collateralized Mortgage Obligations	49.1%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of total investments)^{Footnote Referencea}

Value	Value
B	5.8%
BB	1.0%
BBB	2.7%
A	8.0%
AA	2.0%
AAA	80.5%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Agency, LLC ("Kroll") for securitized debt instruments only (such as asset-backed and mortgage-backed securities), or if unrated, considered to be of comparable credit quality by the Fund’s investment adviser. If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality.

1-800-368-2745

Class A

This semi-annual shareholder report contains important information about the Calvert Short Duration Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 38

$ 2,691,223,094

72.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.3%
Senior Floating-Rate Loans	1.3%
U.S. Government Agency Mortgage-Backed Securities	2.1%
Collateralized Mortgage Obligations	6.2%
Commercial Mortgage-Backed Securities	7.0%
Short-Term Investments	9.8%
Asset-Backed Securities	18.6%
U.S. Treasury Obligations	22.8%
Corporate Bonds	31.9%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash	(2.7%)
Not Rated	3.8%
CCC	0.2%
B	1.2%
BB	2.3%
BBB	22.6%
A	21.9%
AA	9.5%
AAA	41.2%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class C

This semi-annual shareholder report contains important information about the Calvert Short Duration Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 75

$ 2,691,223,094

72.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.3%
Senior Floating-Rate Loans	1.3%
U.S. Government Agency Mortgage-Backed Securities	2.1%
Collateralized Mortgage Obligations	6.2%
Commercial Mortgage-Backed Securities	7.0%
Short-Term Investments	9.8%
Asset-Backed Securities	18.6%
U.S. Treasury Obligations	22.8%
Corporate Bonds	31.9%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash	(2.7%)
Not Rated	3.8%
CCC	0.2%
B	1.2%
BB	2.3%
BBB	22.6%
A	21.9%
AA	9.5%
AAA	41.2%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class I

This semi-annual shareholder report contains important information about the Calvert Short Duration Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 25

$ 2,691,223,094

72.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.3%
Senior Floating-Rate Loans	1.3%
U.S. Government Agency Mortgage-Backed Securities	2.1%
Collateralized Mortgage Obligations	6.2%
Commercial Mortgage-Backed Securities	7.0%
Short-Term Investments	9.8%
Asset-Backed Securities	18.6%
U.S. Treasury Obligations	22.8%
Corporate Bonds	31.9%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash	(2.7%)
Not Rated	3.8%
CCC	0.2%
B	1.2%
BB	2.3%
BBB	22.6%
A	21.9%
AA	9.5%
AAA	41.2%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class R6

This semi-annual shareholder report contains important information about the Calvert Short Duration Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 22

$ 2,691,223,094

72.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.3%
Senior Floating-Rate Loans	1.3%
U.S. Government Agency Mortgage-Backed Securities	2.1%
Collateralized Mortgage Obligations	6.2%
Commercial Mortgage-Backed Securities	7.0%
Short-Term Investments	9.8%
Asset-Backed Securities	18.6%
U.S. Treasury Obligations	22.8%
Corporate Bonds	31.9%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash	(2.7%)
Not Rated	3.8%
CCC	0.2%
B	1.2%
BB	2.3%
BBB	22.6%
A	21.9%
AA	9.5%
AAA	41.2%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class A

This semi-annual shareholder report contains important information about the Calvert Ultra-Short Duration Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 36

$ 705,766,124

47.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.1%
Senior Floating-Rate Loans	1.2%
Commercial Mortgage-Backed Securities	5.4%
Collateralized Mortgage Obligations	6.0%
Short-Term Investments	14.6%
U.S. Treasury Obligations	17.9%
Asset-Backed Securities	19.5%
Corporate Bonds	35.3%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash	(0.3%)
Not Rated	0.6%
BB	1.0%
BBB	29.8%
A	18.1%
AA	12.2%
AAA	38.6%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class I

This semi-annual shareholder report contains important information about the Calvert Ultra-Short Duration Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 23

$ 705,766,124

47.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.1%
Senior Floating-Rate Loans	1.2%
Commercial Mortgage-Backed Securities	5.4%
Collateralized Mortgage Obligations	6.0%
Short-Term Investments	14.6%
U.S. Treasury Obligations	17.9%
Asset-Backed Securities	19.5%
Corporate Bonds	35.3%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash	(0.3%)
Not Rated	0.6%
BB	1.0%
BBB	29.8%
A	18.1%
AA	12.2%
AAA	38.6%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.

1-800-368-2745

Class R6

This semi-annual shareholder report contains important information about the Calvert Ultra-Short Duration Income Fund for the period of October 1, 2024 to March 31, 2025.

You can find additional information about the Fund at www.eatonvance.com/calvert-fund-documents.php. You can also request this information by contacting us at 1-800-368-2745.

<span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 10.6667px; font-weight: 400; grid-area: auto; line-height: 16px; margin: 0px; overflow: visible; text-align: left; white-space-collapse: preserve-breaks;">www.eatonvance.com/calvert-fund-documents.php

$ 21

$ 705,766,124

47.00%

Asset Allocation (% of total investments)

Value	Value
Other^{Footnote Reference†}	0.1%
Senior Floating-Rate Loans	1.2%
Commercial Mortgage-Backed Securities	5.4%
Collateralized Mortgage Obligations	6.0%
Short-Term Investments	14.6%
U.S. Treasury Obligations	17.9%
Asset-Backed Securities	19.5%
Corporate Bonds	35.3%

Footnote	Description
Footnote^†	Investment types less than 1% each

Credit Quality (% of net assets)^{Footnote Referencea}

Value	Value
Cash	(0.3%)
Not Rated	0.6%
BB	1.0%
BBB	29.8%
A	18.1%
AA	12.2%
AAA	38.6%

Footnote

Description

Footnote^a

Ratings are based on Moody’s Investors Service, Inc. (“Moody’s”), S&P Global Ratings (“S&P”) or Fitch Ratings (“Fitch”), or Kroll Bond Rating Agency, LLC (“Kroll”) for securitized debt instruments only (such as asset-backed and mortgage-backed securities). If securities are rated differently by the ratings agencies, the highest rating is applied. Moody's ratings are converted to the S&P, Fitch and Kroll scale with ratings ranging from AAA, being the highest, to D, being the lowest. Ratings of BBB or higher are considered to be investment-grade quality. Holdings designated as “Not Rated” (if any) are not rated by the national ratings agencies stated above.