497

The interactive data file included as an exhibit to this filing relates to the supplement to the prospectus for Multi-Manager Total Return Bond Strategies Fund filed pursuant to Rule 497(e) under the Securities Act of 1933, as amended, on October 25, 2018 (Accession No. 0001193125-18-307363), which is incorporated herein by reference.

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Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	497
Document Period End Date	dei_DocumentPeriodEndDate	Aug. 31, 2017
Registrant Name	dei_EntityRegistrantName	COLUMBIA FUNDS SERIES TRUST I
Central Index Key	dei_EntityCentralIndexKey	0000773757
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Oct. 25, 2018
Document Effective Date	dei_DocumentEffectiveDate	Oct. 25, 2018
Prospectus Date	rr_ProspectusDate	Jan. 01, 2018

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Jan. 01, 2018

Supplement dated October 25, 2018

to the Prospectus and Summary Prospectus of the following fund (the Fund):

Fund	Prospectus and Summary Prospectus Dated
Columbia Funds Series Trust I
Multi-Manager Total Return Bond Strategies Fund	1/1/2018

Effective immediately, the changes described in this supplement are hereby made to the Fund’s Prospectus and Summary Prospectus.

The second paragraph under the subsection "Principal Investment Strategies" in the Summary Prospectus and in the “Summary of the Fund” section of the Prospectus is hereby superseded and replaced with the following:

Under normal market conditions, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in bonds and other debt securities, including debt securities issued by the U.S. Government, its agencies, instrumentalities or sponsored corporations, debt securities issued by corporations, mortgage- and other asset-backed securities, dollar-denominated securities issued by foreign governments, companies or other entities, bank loans and other obligations. For purposes of its 80% test, the Fund treats investment in loans as “debt securities,” even though loans may not be “securities” under certain of the federal securities laws. The Fund may invest up to 20% of its net assets in debt instruments that, at the time of purchase, are rated below investment grade or are unrated but determined to be of comparable quality (commonly referred to as “high-yield” investments or “junk” bonds). The Fund may invest in fixed income securities of any maturity and does not seek to maintain a particular dollar-weighted average maturity or duration at the Fund level.

The rest of the section remains the same.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

COLUMBIA FUNDS SERIES TRUST I

Prospectus Date

rr_ProspectusDate

Jan. 01, 2018

Supplement [Text Block]

cfsti_SupplementTextBlock

Supplement dated October 25, 2018

to the Prospectus and Summary Prospectus of the following fund (the Fund):

Fund	Prospectus and Summary Prospectus Dated
Columbia Funds Series Trust I
Multi-Manager Total Return Bond Strategies Fund	1/1/2018

Effective immediately, the changes described in this supplement are hereby made to the Fund’s Prospectus and Summary Prospectus.

The second paragraph under the subsection "Principal Investment Strategies" in the Summary Prospectus and in the “Summary of the Fund” section of the Prospectus is hereby superseded and replaced with the following:

Under normal market conditions, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in bonds and other debt securities, including debt securities issued by the U.S. Government, its agencies, instrumentalities or sponsored corporations, debt securities issued by corporations, mortgage- and other asset-backed securities, dollar-denominated securities issued by foreign governments, companies or other entities, bank loans and other obligations. For purposes of its 80% test, the Fund treats investment in loans as “debt securities,” even though loans may not be “securities” under certain of the federal securities laws. The Fund may invest up to 20% of its net assets in debt instruments that, at the time of purchase, are rated below investment grade or are unrated but determined to be of comparable quality (commonly referred to as “high-yield” investments or “junk” bonds). The Fund may invest in fixed income securities of any maturity and does not seek to maintain a particular dollar-weighted average maturity or duration at the Fund level.

The rest of the section remains the same.

Multi-Manager Total Return Bond Strategies Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

cfsti_SupplementTextBlock

Supplement dated October 25, 2018

to the Prospectus and Summary Prospectus of the following fund (the Fund):

Fund	Prospectus and Summary Prospectus Dated
Columbia Funds Series Trust I
Multi-Manager Total Return Bond Strategies Fund	1/1/2018

Effective immediately, the changes described in this supplement are hereby made to the Fund’s Prospectus and Summary Prospectus.

The second paragraph under the subsection "Principal Investment Strategies" in the Summary Prospectus and in the “Summary of the Fund” section of the Prospectus is hereby superseded and replaced with the following:

Under normal market conditions, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in bonds and other debt securities, including debt securities issued by the U.S. Government, its agencies, instrumentalities or sponsored corporations, debt securities issued by corporations, mortgage- and other asset-backed securities, dollar-denominated securities issued by foreign governments, companies or other entities, bank loans and other obligations. For purposes of its 80% test, the Fund treats investment in loans as “debt securities,” even though loans may not be “securities” under certain of the federal securities laws. The Fund may invest up to 20% of its net assets in debt instruments that, at the time of purchase, are rated below investment grade or are unrated but determined to be of comparable quality (commonly referred to as “high-yield” investments or “junk” bonds). The Fund may invest in fixed income securities of any maturity and does not seek to maintain a particular dollar-weighted average maturity or duration at the Fund level.

The rest of the section remains the same.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	COLUMBIA FUNDS SERIES TRUST I
Prospectus Date	rr_ProspectusDate	Jan. 01, 2018
Document Creation Date	dei_DocumentCreationDate	Oct. 25, 2018