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Interest Owed and Earned
Note: Interest owed and earned on International Fuel Tax Agreement (IFTA) tax are set by IFTA, Inc. Interest rates for current and prior years can be found at IFTA, Inc.
Interest Owed on Past Due Payments
Past due taxes are charged interest beginning 61 days after the due date. The interest-owed rate for most taxes varies annually and is set at prime rate plus 1 percent. See Texas Tax Code Section 111.060.
The prime rate is published in the Wall Street Journal on the first business day of the year.
Interest Rates and Calculations
Calculating Interest Owed
- Multiply the tax due by the annual interest rate (interest should be in decimals).
- Multiply the calculated figure from step one by the number of days interest accrues.
- Divide the total from step two by the number of days in a year (365 days for "non-leap," i.e., most years; or 366 days for leap years).
EXAMPLE – For 2025, if you owe $1,000 in taxes at a rate of 8.50 percent (.0850) for 150 days, then you owe $34.93 of interest.
- $1,000 (tax due) multiplied by .0850 (annual interest rate) equals $85.00.
- $85.00 multiplied by 150 (days of interest) equals $12,750.
- Divide $12,750 by 365 days. The interest owed is $34.93.
| Year | Annual Rate Prime +1 |
|---|---|
| 2025 | 8.50 percent (.0850) |
| 2024 | 9.50 percent (.0950) |
| 2023 | 8.50 percent (.0850) |
| 2022 | 4.25 percent (.0425) |
Historical Interest-Owed Rates
| Year | Annual Rate Prime +1 |
|---|---|
| 2021 | 4.25 percent (.0425) |
| 2020 | 5.75 percent (.0575) |
| 2019 | 6.50 percent (.0650) |
| 2018 | 5.50 percent (.0550) |
| 2017 | 4.75 percent (.0475) |
| 2016 | 4.50 percent (.0450) |
| 2015 | 4.25 percent (.0425) |
| 2014 | 4.25 percent (.0425) |
| 2013 | 4.25 percent (.0425) |
| 2012 | 4.25 percent (.0425) |
| 2011 | 4.25 percent (.0425) |
| 2010 | 4.25 percent (.0425) |
| 2009 | 4.25 percent (.0425) |
| 2008 | 8.25 percent (.0825) |
| 2007 | 9.25 percent (.0925) |
| 2006 | 8.25 percent (.0825) |
| 2005 | 6.25 percent (.0625) |
| 2004 | 5.00 percent (.0500) |
| 2003 | 5.25 percent (.0525) |
| 2002 | 5.75 percent (.0575) |
| 2001 | 10.50 percent (.1050) |
| 2000 | 9.50 percent (.0950) |
Interest Earned on Credits and Refunds
Filed refund claims accrue credit interest at either the treasury pool rate or prime rate plus 1 percent, whichever is less.
The credit interest will vary annually until the credit is refunded or applied to a liability.
Interest Earned
Calculating Interest Earned
- Multiply the tax credit by the credit interest rate (interest should be in decimals).
- Multiply the calculated figure from step one by the number of days interest accrues.
- Divide the total from step two by the number of days in a year (365 days for "non-leap," i.e., most years; or 366 days for leap years).
Note: Unless the statute of limitations has been tolled, by law the Comptroller’s office may not issue refund payments for more than four years from the date the tax became due and payable. See Texas Tax Code Sections 111.0041, 111.108, 111.201 and 111.207.
EXAMPLE – For 2025, if you earned interest on $1,000 at a rate of 4.597 percent (.04597) for 150 days, then you earned $18.89 of interest.
- $1,000 (tax credit) multiplied by .04597 (credit interest rate) equals $45.97.
- $45.97 multiplied by 150 (days of interest) equals $6,895.50.
- Divide $6,895.50 by 365 days. The interest earned is $18.89.
| Year | Annual Rate - Prime +1 | Annual Rate - Treasury Pool |
|---|---|---|
| 2025 | 8.50 percent (.0850) | 4.597 percent (.04597) |
| 2024 | 9.50 percent (.0950) | 4.981 percent (.04981) |
| 2023 | 8.50 percent (.0850) | 3.018 percent (.03018) |
| 2022 | 4.25 percent (.0425) | 0.276 percent (.00276) |
For more information, see Treasury Pool Rates or Historical Treasury Pool Interest Earned Rates Chart below.
Historical Treasury Pool Interest Earned Rates
| Year | Annual Rate - Prime +1 | Annual Rate - Treasury Pool |
|---|---|---|
| 2021 | 4.25 percent (.0425) | 0.511 percent (.00511) |
| 2020 | 5.75 percent (.0575) | 2.181 percent (.02181) |
| 2019 | 6.50 percent (.0650) | 2.42 percent (.02420) |
| 2018 | 5.50 percent (.0550) | 1.429 percent (.01429) |
| 2017 | 4.75 percent (.0475) | 1.004 percent (.01004) |
| 2016 | 4.50 percent (.0450) | 0.634 percent (.00634) |
| 2015 | 4.25 percent (.0425) | 0.469 percent (.00469) |
| 2014 | 4.25 percent (.0425) | 0.385 percent (.00385) |
| 2013 | 4.25 percent (.0425) | 0.465 percent (.00465) |
| 2012 | 4.25 percent (.0425) | 0.692 percent (.00692) |
| 2011 | 4.25 percent (.0425) | 0.921 percent (.00921) |
| 2010 | 4.25 percent (.0425) | 1.574 percent (.01574) |
| 2009 | 4.25 percent (.0425) | 2.511 percent (.02511) |
| 2008 | 8.25 percent (.0825) | 4.764 percent (.04764) |
| 2007 | 9.25 percent (.0925) | 5.066 percent (.05066) |
| 2006 | 8.25 percent (.0825) | 4.068 percent (.04068) |
| 2005 | 6.25 percent (.0625) | 2.187 percent (.02187) |
| 2004 | 5.00 percent (.0500) | 1.517 percent (.01517) |
| 2003 | 5.25 percent (.0525) | 2.107 percent (.02107) |
| 2002 | 5.75 percent (.0575) | 3.465 percent (.03465) |
| 2001 | 10.50 percent (.1050) | 6.140 percent (.06140) |
| 2000 | 9.50 percent (.0950) | 5.619 percent (.05619) |
Credit Interest Summary
The Comptroller's office pays interest on refunds and transfers of taxes paid in error. Interest begins to accrue 61 days after the date of the payment or the due date of the tax report, whichever is later. Credit interest does not accrue for amounts subject to Title 6, Property Code nor did it accrue for any tax report periods due before Jan. 1, 2000.
The interest rate is determined by the date of the refund claim. The refund claim must:
- Be in writing and state fully and in detail each reason or ground on which the claim is founded;
- Identify the period during which the claimed overpayment was made; and
- Be submitted to the Comptroller’s office within the applicable limitations period, generally within four years from the date the tax was due and payable.
The credit interest rate for tax refunds is the lesser of the annual:
- Treasury pool rate earned on deposits in the state treasury during November of the previous calendar year; or
- Prime rate plus 1 percent. The prime rate is published in the Wall Street Journal on the first business day of the year.
EXAMPLE – A tax return was due on May 20, 2024, and the report was filed and the tax paid on time. An amended return was filed with a statement of grounds on Aug. 20, 2024, creating a credit of $1,000. The credit interest began on the 61st day after May 20, 2024, which was July 20, 2024. The lower of the treasury pool rate or prime rate plus 1 percent calculation applies.
Credits in Audits
If a taxpayer is scheduled for credit during an audit, the credit amount will be refunded once the audit is completed. The credit amount will earn interest at the lesser of the treasury pool rate or prime rate plus 1 percent in effect on the entrance conference date of the audit.
Refund Claims Verified by Audit
Refund claims accrue interest at the lesser of the treasury pool rate, or prime rate plus 1 percent.
Transfers
Each transfer of a credit is treated as a new transaction. Credit transfers accrue interest at the lesser of the treasury pool rate, or prime rate plus 1 percent.
EXAMPLE – A taxpayer amended its timely filed January 20, 2024 report on April 1, 2024, creating a $5,000 credit.
- A transfer request moved the $5,000 credit to the taxpayer’s May 2024 filing period, for which credit interest accrues at the lesser of the two rates.
- A second transfer was filed on July 1, 2024, moving $1,000 to the taxpayer’s August 20, 2023 filing period. For this transfer, no credit interest accrues. Transfers of credit to previous periods are not subject to credit interest.
98-304
(01/2025)