Title 26 › Subtitle Subtitle F— Procedure and Administration › Chapter 63— ASSESSMENT › Subchapter C— Treatment of Partnerships › Part III— PROCEDURE › § 6235
The IRS generally cannot adjust a partnership's tax year after the latest of three deadlines: 3 years after the return was filed, 3 years after the return's due date, or 3 years after the partnership asked for its own adjustment. Two special windows can run later: 270 days after a partnership submits everything needed to modify an imputed underpayment, or 330 days after a notice of proposed adjustment, each plus any agreed extension. The partnership and the IRS can agree to extend the period. There is no time limit if the return was false or fraudulent or no return was filed, and the window stretches to 6 years if the partnership leaves out a large amount of gross income.
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Internal Revenue Code — Source: USLM XML via OLRC
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Reference
Citation
26 U.S.C. § 6235
Title 26 — Internal Revenue Code
Last Updated
Apr 6, 2026
Release point: 119-73