Title 26 › Subtitle A — Income Taxes › CHAPTER 1 — NORMAL TAXES AND SURTAXES › Subchapter B — Computation of Taxable Income › PART I — DEFINITION OF GROSS INCOME, ADJUSTED GROSS INCOME, TAXABLE INCOME, ETC. › § 66
When two people are married at any time in a year but live apart the whole year, do not file a joint tax return for that year, have earned income that is treated as community income, and do not transfer any of that earned income between them before year end, then that community income is handled under the rules in section 879(a). The Secretary of the Treasury can ignore community property rules for any taxpayer who acts like the income is only theirs and fails to tell their spouse, before the tax return due date (including extensions), what kind and how much income it was. If someone files separately and leaves out community income that under section 879(a) would belong to the other spouse, and they prove they did not know and had no reason to know about it and it would be unfair to tax them, then the income is put on the other spouse’s return. The Secretary may also relieve tax liability in other unfair situations under rules the Secretary makes. Definitions: Earned income — meaning in section 911(d)(2). Community income — income treated as community under community property law. Community property laws — laws of a State, foreign country, or U.S. possession.
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Internal Revenue Code, Source: USLM XML via OLRC
Legislative History
Reference
Citation
26 U.S.C. § 66
Title 26, Internal Revenue Code
Last Updated
Sep 22, 2026
Release point: 119-110