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Putnam Sustainable Retirement 2045 Fund - Class C Regulatory Documents

Effective on or about February 27, 2026, this fund will make the following changes: 1) name change to Putnam Retirement Advantage Plus 2045 Fund and 2) principal investment strategy change to pursing its investment objective by investing primarily in mutual funds and closed-end funds managed by Franklin Advisers, Inc—each fund’s Investment Manager—or its affiliates that invest primarily in in equity, fixed income and alternative asset classes. Refer to the prospectus for more information on these and other changes. Date is subject to change.

Prospectus

Statement Of Additional Information

Annual Report

Annual Financial Statements And Other Information

Semi-Annual Report

Semi-Annual Financial Statements And Other Information

Fiscal Q1 Holdings

Fiscal Q3 Holdings