Internal Revenue Code · 26 U.S.C.

§ 6201. Assessment authority

In force Text current through Public Law 119-121 (October 9, 2026) release point 119-121

Official text, no changes From the Office of the Law Revision Counsel, release point 119-121 (current through Public Law 119-121 (October 9, 2026)). Compare it with the official text at uscode.house.gov (external site).

Cite as 26 U.S.C. § 6201

At a glance

Read from the text, the source credit and the official notes. Not part of the law.

Status: In force
Enacted: June 21, 1965 by Pub. L. 89–44
Last amended: March 23, 2018 by Pub. L. 115–141
Amendments: 14 dated changes in the source credit
Length: 5 subsections · 1,013 words · about 4 min to read
Cross-references: cites 7; cited by 4 Code sections and 6 other regulations
Regulations: 1 issued under this section

¶(a) Authority of Secretary The Secretary is authorized and required to make the inquiries, determinations, and assessments of all taxes (including interest, additional amounts, additions to the tax, and assessable penalties) imposed by this title, or accruing under any former internal revenue law, which have not been duly paid by stamp at the time and in the manner provided by law. Such authority shall extend to and include the following:

¶(1) Taxes shown on return

The Secretary shall assess all taxes determined by the taxpayer or by the Secretary as to which returns or lists (or payments under section 6225(c)(2)(B)(i)) are made under this title.

¶(2) Unpaid taxes payable by stamp

¶(A) Omitted stamps

Whenever any article upon which a tax is required to be paid by means of a stamp is sold or removed for sale or use by the manufacturer thereof or whenever any transaction or act upon which a tax is required to be paid by means of a stamp occurs without the use of the proper stamp, it shall be the duty of the Secretary, upon such information as he can obtain, to estimate the amount of tax which has been omitted to be paid and to make assessment therefor upon the person or persons the Secretary determines to be liable for such tax.

¶(B) Check or money order not duly paid

In any case in which a check or money order received under authority of section 6311 as payment for stamps is not duly paid, the unpaid amount may be immediately assessed as if it were a tax imposed by this title, due at the time of such receipt, from the person who tendered such check or money order.

¶(3) Erroneous income tax prepayment credits

If on any return or claim for refund of income taxes under subtitle A there is an overstatement of the credit for income tax withheld at the source, or of the amount paid as estimated income tax, the amount so overstated which is allowed against the tax shown on the return or which is allowed as a credit or refund may be assessed by the Secretary in the same manner as in the case of a mathematical or clerical error appearing upon the return, except that the provisions of section 6213(b)(2) (relating to abatement of mathematical or clerical error assessments) shall not apply with regard to any assessment under this paragraph.

¶(4) Certain orders of criminal restitution

¶(A) In general

The Secretary shall assess and collect the amount of restitution under an order pursuant to section 3556 of title 18, United States Code, for failure to pay any tax imposed under this title in the same manner as if such amount were such tax.

¶(B) Time of assessment

An assessment of an amount of restitution under an order described in subparagraph (A) shall not be made before all appeals of such order are concluded and the right to make all such appeals has expired.

¶(C) Restriction on challenge of assessment

The amount of such restitution may not be challenged by the person against whom assessed on the basis of the existence or amount of the underlying tax liability in any proceeding authorized under this title (including in any suit or proceeding in court permitted under section 7422).

¶(b) Amount not to be assessed

¶(1) Estimated income tax

No unpaid amount of estimated income tax required to be paid under section 6654 or 6655 shall be assessed.

¶(2) Federal unemployment tax

No unpaid amount of Federal unemployment tax for any calendar quarter or other period of a calendar year, computed as provided in section 6157, shall be assessed.

¶(c) Compensation of child

Any income tax under chapter 1 assessed against a child, to the extent attributable to amounts includible in the gross income of the child, and not of the parent, solely by reason of section 73(a), shall, if not paid by the child, for all purposes be considered as having also been properly assessed against the parent.

¶(d) Required reasonable verification of information returns

In any court proceeding, if a taxpayer asserts a reasonable dispute with respect to any item of income reported on an information return filed with the Secretary under subpart B or C of part III of subchapter A of chapter 61 by a third party and the taxpayer has fully cooperated with the Secretary (including providing, within a reasonable period of time, access to and inspection of all witnesses, information, and documents within the control of the taxpayer as reasonably requested by the Secretary), the Secretary shall have the burden of producing reasonable and probative information concerning such deficiency in addition to such information return.

¶(e) Deficiency proceedings

For special rules applicable to deficiencies of income, estate, gift, and certain excise taxes, see subchapter B.

(Aug. 16, 1954, ch. 736, 68A Stat. 767; Pub. L. 89–44, title VIII, § 809(d)(4)(A), June 21, 1965, 79 Stat. 168; Pub. L. 91–53, § 2(b), Aug. 7, 1969, 83 Stat. 92; Pub. L. 91–172, title I, § 101(j)(38), Dec. 30, 1969, 83 Stat. 530; Pub. L. 91–258, title II, § 207(d)(1), (2), May 21, 1970, 84 Stat. 248; Pub. L. 93–406, title II, § 1016(a)(8), Sept. 2, 1974, 88 Stat. 929; Pub. L. 94–12, title II, § 204(b)(2), Mar. 29, 1975, 89 Stat. 31; Pub. L. 94–455, title XII, § 1206(c)(2), title XIII, § 1307(d)(2)(D), title XIX, § 1906(b)(13)(A), Oct. 4, 1976, 90 Stat. 1704, 1727, 1834; Pub. L. 97–424, title V, § 515(b)(6)(E), Jan. 6, 1983, 96 Stat. 2182; Pub. L. 98–76, title II, § 231(b)(2)(A), Aug. 12, 1983, 97 Stat. 429; Pub. L. 98–369, div. A, title IV, §§ 412(b)(5), 474(r)(32), July 18, 1984, 98 Stat. 792, 845; Pub. L. 100–203, title X, § 10301(b)(3), Dec. 22, 1987, 101 Stat. 1330–429; Pub. L. 100–647, title I, § 1015(r)(1), title VII, § 7106(c)(2), Nov. 10, 1988, 102 Stat. 3572, 3773; Pub. L. 104–168, title VI, § 602(a), July 30, 1996, 110 Stat. 1463; Pub. L. 111–237, § 3(a), Aug. 16, 2010, 124 Stat. 2497; Pub. L. 115–141, div. U, title II, § 203(b), Mar. 23, 2018, 132 Stat. 1176.)

Regulations under this section

Treasury regulations (26 CFR) issued under § 6201

§ 301.6201-1 Assessment authority.

Cross-references

Computed from the citations in the text of Title 26 and 26 CFR.

This section cites 7 other sections

Cited by 4 Code sections

Cited in 6 regulations not issued under it

Amendment history

From the source credit and the official notes, newest first.

March 23, 2018Amended by Pub. L. 115–141Parts changed in 2018: (a)(1)
August 16, 2010Amended by Pub. L. 111–237Parts changed in 2010: (a)(4)
July 30, 1996Amended by Pub. L. 104–168Parts changed in 1996: (d)
November 10, 1988Amended by Pub. L. 100–647Parts changed in 1988: (a)(4) (b)(2)
December 22, 1987Amended by Pub. L. 100–203Parts changed in 1987: (b)(1)
July 18, 1984Amended by Pub. L. 98–369Parts changed in 1984: (a)(4) (b)(1)
August 12, 1983Amended by Pub. L. 98–76Parts changed in 1983: (a)(4) (b)(2)
January 6, 1983Amended by Pub. L. 97–424
October 4, 1976Amended by Pub. L. 94–455Parts changed in 1976: (a) (a)(3) (d)
March 29, 1975Amended by Pub. L. 94–12Parts changed in 1975: (a)(4)
September 2, 1974Amended by Pub. L. 93–406Parts changed in 1974: (d)
May 21, 1970Amended by Pub. L. 91–258Parts changed in 1970: (a)(4)
December 30, 1969Amended by Pub. L. 91–172Parts changed in 1969: (b) (d)
August 7, 1969Amended by Pub. L. 91–53
June 21, 1965Enacted by Pub. L. 89–44Parts changed in 1965: (a)(4)

Where it sits in the Code

Nearby sections

Official notes

Show the Law Revision Counsel's notes (amendments, effective dates)

Editorial Notes

Amendments

2018—Subsec. (a)(1). Pub. L. 115–141 inserted “(or payments under section 6225(c)(2)(B)(i))” after “returns or lists”.

2010—Subsec. (a)(4). Pub. L. 111–237 added par. (4).

1996—Subsecs. (d), (e). Pub. L. 104–168 added subsec. (d) and redesignated former subsec. (d) as (e).

1988—Subsec. (a)(4). Pub. L. 100–647, § 1015(r)(1), struck out par. (4) which read as follows: “If on any return or claim for refund of income taxes under subtitle A there is an overstatement of the credit allowable by section 34 (relating to certain uses of gasoline and special fuels) or section 32 (relating to earned income), the amount so overstated which is allowed against the tax shown on the return or which is allowed as a credit or refund may be assessed by the Secretary in the same manner as in the case of a mathematical or clerical error appearing upon the return, except that the provisions of section 6213(b)(2) (relating to abatement of mathematical or clerical error assessments) shall not apply with regard to any assessment under this paragraph.”

Subsec. (b)(2). Pub. L. 100–647, § 7106(c)(2), struck out “or tax imposed by section 3321” after “employment tax”.

1987—Subsec. (b)(1). Pub. L. 100–203 substituted “section 6654 or 6655” for “section 6154 or 6654”.

1984—Subsec. (a)(4). Pub. L. 98–369, § 474(r)(32), substituted “section 32 or 34” for “section 39 or 43” in heading, and in text substituted “section 34” for “section 39” and “section 32” for “section 43”.

Subsec. (b)(1). Pub. L. 98–369, § 412(b)(5), amended par. (1) generally, substituting “estimated income tax required to be paid under section 6154 or 6654” for “estimated tax under section 6153 or 6154”.

1983—Subsec. (a)(4). Pub. L. 97–424 substituted “and special fuels” for “, special fuels, and lubricating oil” after “gasoline”.

Subsec. (b)(2). Pub. L. 98–76 substituted “Federal unemployment tax or tax imposed by section 3321” for “Federal unemployment tax”.

1976—Subsec. (a). Pub. L. 94–455, § 1906(b)(13)(A), struck out “or his delegate” after “Secretary”.

Subsec. (a)(3), (4). Pub. L. 94–455, §§ 1206(c)(2), 1906(b)(13)(A), struck out “or his delegate” after “Secretary”, substituted “mathematical or clerical error” for “mathematical error” after “the case of”, and inserted “, except that the provisions of section 6213(b)(2) (relating to abatement of mathematical or clerical error assessments) shall not apply with regard to any assessment under this paragraph” after “upon the return”.

Subsec. (d). Pub. L. 94–455, § 1307(d)(2)(D), substituted “and certain excise taxes” for “chapter 42, and chapter 43 taxes” after “estate, gift”.

1975—Subsec. (a)(4). Pub. L. 94–12 inserted reference to section 43 in heading and substituted “oil) or section 43 (relating to earned income),” for “oil),” in text.

1974—Subsec. (d). Pub. L. 93–406 inserted reference to chapter 43 taxes.

1970—Subsec. (a)(4). Pub. L. 91–258 inserted provision for overstatement of credit allowable by section 39 (relating to certain uses of special fuels) in text and substituted “under section 39” for “for use of gasoline” in heading.

1969—Subsec. (b). Pub. L. 91–53 added subsec. (b) heading and par. (2), and redesignated former subsec. (b), including its heading, as par. (1).

Subsec. (d). Pub. L. 91–172 inserted reference to chapter 42 taxes.

1965—Subsec. (a)(4). Pub. L. 89–44 added par. (4).

Effective Date of 2018 Amendment

Amendment by Pub. L. 115–141 effective as if included in section 1101 of Pub. L. 114–74, see section 207 of Pub. L. 115–141, set out as a note under section 6031 of this title.

Effective Date of 2010 Amendment

Pub. L. 111–237, § 3(c), Aug. 16, 2010, 124 Stat. 2498, provided that: “The amendments made by this section [amending this section and sections 6213 and 6501 of this title] shall apply to restitution ordered after the date of the enactment of this Act [Aug. 16, 2010].”

Effective Date of 1996 Amendment

Pub. L. 104–168, title VI, § 602(b), July 30, 1996, 110 Stat. 1463, provided that: “The amendment made by subsection (a) [amending this section] shall take effect on the date of the enactment of this Act [July 30, 1996].”

Effective Date of 1988 Amendment

Pub. L. 100–647, title I, § 1015(r)(4), Nov. 10, 1988, 102 Stat. 3573, provided that: “The amendments made by this subsection [amending this section and sections 6211 and 6213 of this title] shall apply to notices of deficiencies mailed after the date of the enactment of this Act [Nov. 10, 1988].”

Amendment by section 7106(c)(2) of Pub. L. 100–647 applicable to remuneration paid after Dec. 31, 1988, see section 7106(d) of Pub. L. 100–647, set out as a note under section 3321 of this title.

Effective Date of 1987 Amendment

Amendment by Pub. L. 100–203 applicable to taxable years beginning after Dec. 31, 1987, see section 10301(c) of Pub. L. 100–203, set out as a note under section 585 of this title.

Effective Date of 1984 Amendment

Amendment by section 412(b)(5) of Pub. L. 98–369 applicable with respect to taxable years beginning after Dec. 31, 1984, see section 414(a)(1) of Pub. L. 98–369, set out as a note under section 6654 of this title.

Amendment by section 474(r)(32) of Pub. L. 98–369 applicable to taxable years beginning after Dec. 31, 1983, and to carrybacks from such years, see section 475(a) of Pub. L. 98–369, set out as a note under section 21 of this title.

Effective Date of 1983 Amendment

Amendment by Pub. L. 98–76 applicable to remuneration paid after June 30, 1986, see section 231(d) of Pub. L. 98–76, set out as an Effective Date note under section 3321 of this title.

Amendment by Pub. L. 97–424 applicable with respect to articles sold after Jan. 6, 1983, see section 515(c) of Pub. L. 97–424, set out as a note under section 34 of this title.

Effective Date of 1976 Amendment

Amendment by section 1206(c)(2) of Pub. L. 94–455 applicable with respect to returns filed after Dec. 31, 1976, see section 1206(d) of Pub. L. 94–455, set out as a note under section 6213 of this title.

Amendment by section 1307(d)(2)(D) of Pub. L. 94–455 effective on and after Oct. 4, 1976, see section 1307(e) of Pub. L. 94–455, set out as a note under section 501 of this title.

Effective Date of 1975 Amendment

Amendment by Pub. L. 94–12 applicable to taxable years beginning after Dec. 31, 1974, see section 209(b) of Pub. L. 94–12, as amended, set out as a note under section 32 of this title.

Effective Date of 1974 Amendment

Amendment by Pub. L. 93–406 applicable, except as otherwise provided in section 1017(c) through (i) of Pub. L. 93–406, for plan years beginning after Sept. 2, 1974, but, in the case of plans in existence on Jan. 1, 1974, amendment by Pub. L. 93–406 applicable for plan years beginning after Dec. 31, 1975, see section 1017 of Pub. L. 93–406, set out as an Effective Date; Transitional Rules note under section 410 of this title.

Effective Date of 1970 Amendment

Amendment by Pub. L. 91–258 effective July 1, 1970, see section 211(a) of Pub. L. 91–258, set out as a note under section 4041 of this title.

Effective Date of 1969 Amendments

Amendment by Pub. L. 91–172 effective Jan. 1, 1970, see section 101(k)(1) of Pub. L. 91–172, set out as an Effective Date note under section 4940 of this title.

Amendment by Pub. L. 91–53 applicable with respect to calendar years beginning after Dec. 31, 1969, see section 4(a) of Pub. L. 91–53, set out as an Effective Date note under section 6157 of this title.

Effective Date of 1965 Amendment

Amendment by Pub. L. 89–44 applicable to taxable years beginning on or after July 1, 1965, see section 809(f) of Pub. L. 89–44, set out as a note under section 6420 of this title.