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Notice

Quarterly IRS Interest Rates Used in Calculating Interest on Overdue Accounts and Refunds of Customs Duties

A Notice by the U.S. Customs and Border Protection on 05/18/2026

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Published Document: 2026-09871 (91 FR 28601)

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

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Department of Homeland Security
U.S. Customs and Border Protection

AGENCY:

U.S. Customs and Border Protection, Department of Homeland Security.

ACTION:

General notice.

SUMMARY:

This notice advises the public that the quarterly Internal Revenue Service interest rates used to calculate interest on overdue accounts (underpayments) and refunds (overpayments) of customs duties will decrease from the previous quarter. For the calendar quarter beginning April 1, 2026, the interest rate for underpayments will be 6 percent for both corporations and non-corporations. The interest rate for overpayments will be 6 percent for non-corporations and 5 percent for corporations. This notice is published for the convenience of the importing public and U.S. Customs and Border Protection personnel.

DATES:

The rates announced in this notice are applicable as of April 1, 2026.

FOR FURTHER INFORMATION CONTACT:

Bruce Ingalls, Revenue Division, Collection Refunds & Analysis Branch, 8899 E. 56th Street, Mail Stop 203J, Indianapolis, IN 46249; telephone (317) 298-1107.

SUPPLEMENTARY INFORMATION:

Background

Pursuant to 19 U.S.C. 1505 and Treasury Decision 85-93, published in the Federal Register on May 29, 1985 (50 FR 21832), the interest rate paid on applicable overpayments or underpayments of customs duties must be in accordance with the Internal Revenue Code rate established under 26 U.S.C. 6621 and 6622. Section 6621 provides different interest rates applicable to overpayments: one for corporations and one for non-corporations.

The interest rates are based on the Federal short-term rate and determined by the Internal Revenue Service (IRS) on behalf of the Secretary of the Treasury on a quarterly basis. The rates effective for a quarter are determined during the first-month period of the previous quarter.

In Revenue Ruling 2026-5, the IRS determined the rates of interest for the calendar quarter beginning April 1, 2026, and ending on June 30, 2026. The interest rate paid to the Treasury for underpayments will be the Federal short-term rate (3%) plus three percentage points (3%) for a total of six percent (6%) for both corporations and non-corporations. For overpayments made by non-corporations, the rate is the Federal short-term rate (3%) plus three percentage points (3%) for a total of six percent (6%). For corporate overpayments, the rate is the Federal short-term rate (3%) plus two percentage points (2%) for a total of five percent (5%). These interest rates used to calculate interest on overdue accounts (underpayments) and refunds (overpayments) of customs duties will decrease from the previous quarter. These interest rates are subject to change for the calendar quarter beginning July 1, 2026, and ending on September 30, 2026.

For the convenience of the importing public and U.S. Customs and Border Protection personnel, the following list of IRS interest rates used, covering the period from July of 1974 to date, to calculate interest on overdue accounts and refunds of customs duties, is published in summary format.

Beginning date Ending date Underpayments (percent) Overpayments (percent) Corporate Overpay- ments (Eff. 1-1-99) (percent)
070174 063075 6 6
070175 013176 9 9
020176 013178 7 7
020178 013180 6 6
020180 013182 12 12
020182 123182 20 20
010183 063083 16 16
070183 123184 11 11
010185 063085 13 13
070185 123185 11 11
010186 063086 10 10
070186 123186 9 9
010187 093087 9 8
100187 123187 10 9
010188 033188 11 10
040188 093088 10 9
100188 033189 11 10
040189 093089 12 11
100189 033191 11 10
040191 123191 10 9
010192 033192 9 8
040192 093092 8 7
100192 063094 7 6
070194 093094 8 7
100194 033195 9 8
040195 063095 10 9
070195 033196 9 8
( printed page 28602)
040196 063096 8 7
070196 033198 9 8
040198 123198 8 7
010199 033199 7 7 6
040199 033100 8 8 7
040100 033101 9 9 8
040101 063001 8 8 7
070101 123101 7 7 6
010102 123102 6 6 5
010103 093003 5 5 4
100103 033104 4 4 3
040104 063004 5 5 4
070104 093004 4 4 3
100104 033105 5 5 4
040105 093005 6 6 5
100105 063006 7 7 6
070106 123107 8 8 7
010108 033108 7 7 6
040108 063008 6 6 5
070108 093008 5 5 4
100108 123108 6 6 5
010109 033109 5 5 4
040109 123110 4 4 3
010111 033111 3 3 2
040111 093011 4 4 3
100111 033116 3 3 2
040116 033118 4 4 3
040118 123118 5 5 4
010119 063019 6 6 5
070119 063020 5 5 4
070120 033122 3 3 2
040122 063022 4 4 3
070122 093022 5 5 4
100122 123122 6 6 5
010123 093023 7 7 6
100123 123124 8 8 7
010125 033126 7 7 6
040126 063026 6 6 5

Jeffrey Caine,

Chief Financial Officer, U.S. Customs and Border Protection.

[FR Doc. 2026-09871 Filed 5-15-26; 8:45 am]

BILLING CODE 9111-14-P

Published Document: 2026-09871 (91 FR 28601)