Interest Rates

The interest rate applied to unpaid or underpaid taxes is based on the rate charged by the Internal Revenue Service plus 3 percent. Every January and July the Board evaluates the rates. If it is determined that a rate change is required, the change takes effect 6 months later and remains in effect for at least 6 months.

An interest calculator is available to help calculate interest due.

For more information about when interest applies and when you may be relieved of interest charges, see Publication 75, Interest and Penalties

Period
Beginning - Ending
"Debit" Rate
for
Deficiencies
"Credit" Rate
for
Refunds
Monthly Factor *
07/01/14 – 12/31/14 6% 0% .00500 / .00000
01/01/14 06/30/14 6% 0% .00500 / .00000
07/01/13 12/31/13 6% 0% .00500 / .00000
01/01/13 - 06/30/13 6% 0% .00500 / .00000
07/01/12 - 12/31/12 6% 0% .00500 / .00000
01/01/12 - 06/30/12 7% 0% .00583 / .00000
07/01/11 - 12/31/11 6% 0% .00500 / .00000
01/01/10 - 06/30/11 7% 0% .00583 /.00000
07/01/09 - 12/31/09 8% 0% .00667 /.00000
01/01/09 - 06/30/09 8% 2% .00667 /.00167
07/01/08 - 12/31/08 10% 3% .00833 /.0025
01/01/07 - 06/30/08 11% 5% .00917 /.00417
07/01/06 - 12/31/06 10% 4% .00833 /.00333
01/01/06 - 06/30/06 9% 3% .0075 /.0025
07/01/05 - 12/31/05 8% 2% .00667 /.00167
07/01/04 - 06/30/05 7% 1% .00583 /.00083
07/01/03 - 06/30/04 8% 1% .00667 /.00083
07/01/02 - 06/30/03 9% 2% .0075 /.00167
01/01/02 - 06/30/02 10% 4% .00833 /.00333
01/01/01 - 12/31/01 12% 6% .010000 /.00500

* Applied to each month or fraction of a month that a tax or fee payment is overdue or a refund is owed.

These rates do not apply to the IFTA (International Fuel Tax Agreement) program. For more information on IFTA rates, you can visit the International Fuel Tax Agreement (IFTA) - Interest Rates page.