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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-06 10:51:44 -04:00

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LegalText 26 U.S.C. § 6663 Imposition of fraud penalty us united_states_code code_section 26 INTERNAL REVENUE CODE 68 ADDITIONS TO THE TAX, ADDITIONAL AMOUNTS, AND ASSESSABLE PENALTIES 6663 26 U.S.C. § 6663 current 119-100 2026-06-26 official https://uscode.house.gov/download/releasepoints/us/pl/119/100/xml_usc26@119-100.zip /us/usc/t26/s6663 data/legal/raw/us/code/title-26/usc26.xml 3494eb39e08b41aacd6c0a2b5f1087f4685665a140d753a9e2cec9d2cd2962b5 a261f094809116f42a96648a3d5eee80fa010379d67412551c21dd5c900b27f4 988d0de14f183e5a204632c52527e9ffb1def4f11d06302defcd631e511c65bf 2026-07-04 official
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26 U.S.C. § 6663 - Imposition of fraud penalty

Text

(a) Imposition of penalty If any part of any underpayment of tax required to be shown on a return is due to fraud, there shall be added to the tax an amount equal to 75 percent of the portion of the underpayment which is attributable to fraud.

(b) Determination of portion attributable to fraud If the Secretary establishes that any portion of an underpayment is attributable to fraud, the entire underpayment shall be treated as attributable to fraud, except with respect to any portion of the underpayment which the taxpayer establishes (by a preponderance of the evidence) is not attributable to fraud.

(c) Special rule for joint returns In the case of a joint return, this section shall not apply with respect to a spouse unless some part of the underpayment is due to the fraud of such spouse.

(Added Pub. L. 101239, title VII, § 7721(a), Dec. 19, 1989, 103 Stat. 2397.)

Notes

Statutory Notes and Related Subsidiaries

Effective DateSection applicable to returns the due date for which (determined without regard to extensions) is after Dec. 31, 1989, see section 7721(d) of Pub. L. 101239, set out as an Effective Date of 1989 Amendment note under section 461 of this title.