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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Central Index Key dei_EntityCentralIndexKey 0000701039
Calvert Short Duration Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement, Text Block cik0000701039_SupplementTextBlock

CALVERT SHORT DURATION INCOME FUND

Supplement to Prospectus dated February 1, 2017

 

Purchases on and after April 10, 2017 of Class A shares of Calvert Short Duration Income Fund made in accounts with $250,000 or more at net asset value will not be subject to a contingent deferred sales charge (“CDSC”) and no finder’s fee will be paid in connection with such purchases.  Class A shares in such accounts purchased prior to April 10, 2017 will continue to be subject to any applicable CDSC.

The following changes are effective April 10, 2017:

1. The following replaces the first paragraph and the table under “Fees and Expenses of the Fund” in “Fund Summaries – Calvert Short Duration Income Fund”:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Calvert mutual funds. Certain financial intermediaries also may offer variations in Fund sales charges to their customers, which when available will be described in an appendix to the Prospectus.  More information about these and other discounts is available from your financial professional and under “Choosing a Share Class” on page 57 and “Reduced Sales Charges” on page 61 of this Prospectus, and under “Method of Distribution” on page 35 of the Fund’s Statement of Additional Information.

         
Shareholder Fees (fees paid directly from your investment) Class A Class C Class Y Class I
Maximum sales charge (load) on purchases (as a % of offering price) 2.75% None None None
Maximum deferred sales charge (load) (as a % of amount purchased or redeemed, whichever is lower) None(1) 1.00%(2) None None

 

         
Annual Fund Operating Expenses (expenses that you pay each year as a % of the value of your investment) Class A Class C Class Y Class I
Management fees(3) 0.46% 0.46% 0.46% 0.46%
Distribution and service (12b-1) fees 0.25% 1.00% None None
Other expenses 0.20% 0.20% 0.15% 0.08%
Total annual fund operating expenses 0.91% 1.66% 0.61% 0.54%
Less fee waiver and/or expense reimbursement(4) (0.03)% 0.00% 0.00% (0.02)%(5)
Total annual fund operating expenses after fee waiver and/or expense reimbursement 0.88% 1.66% 0.61% 0.52%

(1)Class A shares purchased prior to April 10, 2017 at net asset value for accounts with $250,000 or more on which a finder’s fee has been paid are subject to a one year contingent deferred sales charge of 0.50%.
(2)Applies to redemptions of Class C shares within one year of purchase.
(3)Management fees are restated to reflect current contractual fees rather than the fees paid during the previous fiscal year.
(4)Calvert Research and Management (“CRM”) has agreed to reimburse the Fund’s expenses to the extent that Total Annual Fund Operating Expenses exceed 0.88% for Class A shares, 0.95% for Class Y  shares and 0.75% for Class I shares. This expense reimbursement will continue through January 31, 2018. Any amendment to or termination of this reimbursement would require approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses of unaffiliated funds, interest expense, taxes or litigation expenses. Amounts reimbursed may be recouped by CRM during the same fiscal year to the extent actual expenses are less than the contractual expense cap during such year.
(5)The contractual administrative fee is 0.12%. CRM has agreed to contractually waive 0.02% of the administrative fee on Class I shares through January 31, 2018.

 

The following replaces the introductory paragraph and sales charge table under “Class A (All Funds)” in “Shareholder Information”:

Calvert Short Duration Income Fund Sales Charge % of offering price % of Amt. Invested
Less than $50,000 2.75% 2.83%
$50,000 but less than $100,000 2.25% 2.30%
$100,000 but less than $250,000 1.75% 1.78%
$250,000 and over None None

 

* This is called “Rights of Accumulation.” The sales charge is calculated by taking into account not only the dollar amount of the new purchase of shares, but also the current value of shares you have previously purchased in Calvert Funds that impose sales charges.
** Purchases of Class A shares at net asset value for accounts with $1,000,000 or more on which a finder’s fee by the Fund’s principal underwriter has been paid are subject to a one year contingent deferred sales charge (“CDSC”) of 0.80%.

The Class A front-end sales charge may be waived for certain purchases or investors, such as participants in certain group retirement plans or other qualified groups and clients of certain investment advisers. See “Reduced Sales Charges” in this Prospectus.

The following replaces “Additional Payments to Financial Intermediaries” in “Shareholder Information”:

Additional Payments to Financial Intermediaries

CRM, EVD, or their affiliates may pay, from their own resources, certain broker/dealers and/or other persons, for the sale, marketing and distribution of the securities or for services to a Fund. These amounts may be significant. These payments are generally intended to compensate broker/dealers for certain activities, including the following: promotion of sales of Fund shares, such as placing Calvert funds on a preferred list of fund families; making Fund shares available on certain platforms, programs, or trading venues; building brand awareness and educating a broker/dealer’s sales force about the Calvert funds; access to senior management and sales representatives of a broker/dealer; and various other promotional efforts and/or costs. Payments to broker/dealers may be used to cover costs and expenses related to these promotional efforts, including travel, lodging, entertainment and meals, among other things. In addition, payments may also be made in connection with EVD’s participation in or support of conferences and other events sponsored, hosted or organized by the broker/dealer.  CRM, EVD or their affiliates may make such payments on a fixed or variable basis based on Fund sales, assets, transactions processed and/or accounts attributable to a broker/dealer, among other factors, including the quality of the broker/dealer's relationship with CRM, EVD or their affiliates. CRM, EVD or their affiliates determine the amount of these payments in its sole discretion. These payments may create an incentive for a broker-dealer or its representatives to recommend or offer shares of a Fund to its customers. CRM may benefit from these payments to the extent the broker/dealers sell more Fund shares because CRM receives greater management and other fees as Fund assets increase.  These additional payments are made by CRM, EVD or their affiliates and do not increase the amount paid by shareholders or the Fund. For more specific information about these payments made to your broker/dealer or other financial intermediary and the conflicts of interest that may arise from such arrangements, please contact your investment professional.

Payments may include additional compensation beyond the regularly scheduled rates, and finder’s fees. EVD pays broker/dealers a finder’s fee in connection with sales of Class A shares of the Funds listed below purchased at NAV in accounts with $1 million or more as follows:

Calvert Short Duration Income Fund

For purchases of Class A shares at NAV prior to April 10, 2017 for accounts with $250,000 or more, the finder’s fee is 0.50% of the NAV purchase amount on the first $2 million, 0.40% over $2 million up to $3 million, 0.25% over $3 million up to $50 million, 0.125% over $50 million up to $100 million and 0.075% over $100 million. Class A shares purchased prior to April 10, 2017 for accounts with $250,000 or more and for which a finder’s fee was paid are subject to a one year CDSC of 0.50%.  Such purchases of Class A shares on and after April 10, 2017 will not be subject to a CDSC and no finder’s fee will be payable in connection with such purchases.

 

March 7, 2017 250759 3.7.17
Expense, Narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Calvert mutual funds. Certain financial intermediaries also may offer variations in Fund sales charges to their customers, which when available will be described in an appendix to the Prospectus. More information about these and other discounts is available from your financial professional and under “Choosing a Share Class” on page 57 and “Reduced Sales Charges” on page 61 of this Prospectus, and under “Method of Distribution” on page 35 of the Fund’s Statement of Additional Information.
Shareholder Fees, Caption rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a % of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

January 31, 2018
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Calvert mutual funds. Certain financial intermediaries also may offer variations in Fund sales charges to their customers, which when available will be described in an appendix to the Prospectus. More information about these and other discounts is available from your financial professional and under “Choosing a Share Class” on page 57 and “Reduced Sales Charges” on page 61 of this Prospectus, and under “Method of Distribution” on page 35 of the Fund’s Statement of Additional Information.
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expenses Restated to Reflect Current rr_ExpensesRestatedToReflectCurrent

Management fees are restated to reflect current contractual fees rather than the fees paid during the previous fiscal year.
Calvert Short Duration Income Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.75%
Maximum deferred sales charge (load) (as a % of amount purchased or redeemed, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.46% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 0.91%
Less fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.88%
Calvert Short Duration Income Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of amount purchased or redeemed, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [4]
Management fees rr_ManagementFeesOverAssets 0.46% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 1.66%
Less fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.66%
Calvert Short Duration Income Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of amount purchased or redeemed, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.46% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.08%
Total annual fund operating expenses rr_ExpensesOverAssets 0.54%
Less fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [3],[5]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.52%
Calvert Short Duration Income Fund | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of amount purchased or redeemed, whichever is lower) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.46% [2]
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 0.61%
Less fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [5]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.61%
[1] Class A shares purchased prior to April 10, 2017 at net asset value for accounts with $250,000 or more on which a finder's fee has been paid are subject to a one year contingent deferred sales charge of 0.50%.
[2] Management fees are restated to reflect current contractual fees rather than the fees paid during the previous fiscal year.
[3] Calvert Research and Management ("CRM") has agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 0.88% for Class A shares, 0.95% for Class Y shares and 0.75% for Class I shares. This expense reimbursement will continue through January 31, 2018. Any amendment to or termination of this reimbursement would require approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses of unaffiliated funds, interest expense, taxes or litigation expenses. Amounts reimbursed may be recouped by CRM during the same fiscal year to the extent actual expenses are less than the contractual expense cap during such year.
[4] Applies to redemptions of Class C shares within one year of purchase.
[5] The contractual administrative fee is 0.12%. CRM has agreed to contractually waive 0.02% of the administrative fee on Class I shares through January 31, 2018.