Idaho State Tax Commission

Tax Commission News Release

Need an extension to file your Idaho income tax return?

BOISE, Idaho — April 14, 2022 — Can’t file your 2021 Idaho income tax return by the April 18 deadline? Pay enough of your total tax due by April 18, and you can get an automatic six-month extension.

To qualify, you need to pay one of the following:

  • 80% of the estimated tax you owe for 2021
  • 100% of the total tax reported on your 2020 income tax return (if you filed a return)

An automatic extension means you don’t have to send a written request. But an extension of time to file your return isn’t an extension of time to pay your tax. With a valid extension, you can avoid a penalty for filing late, but you’ll owe 3% annual interest on any tax you owe after April 18 until you pay it.

To see if you qualify for an extension, complete the worksheet on Idaho Form 51, Estimated Payment of Individual Income Tax. The worksheet will help you figure out if you owe more tax beyond any payments you’ve made or any amounts withheld from your paychecks or unemployment checks. You can find Form 51 at tax.idaho.gov.

To make a payment and avoid a filing penalty, do one of the following:

  • Mail Form 51 with your check or money order. 
  • Make an online payment through the Idaho State Tax Commission website. See the E-Pay page at tax.idaho.gov/epay. The free Quick Pay service lets you make an online payment without creating a special account. 
  • Make a payment at any Tax Commission office

If you qualify for an extension to file, you must file your Idaho tax return and pay any tax still due by October 17.

For more information, call the Tax Commission at (208) 334-7660 in the Boise area or toll free at (800) 972-7660. 

Posted 04-14-2022
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This information is for general guidance only. Tax laws are complex and change regularly. We can't cover every circumstance in our guides. This guidance may not apply to your situation. Please contact us with any questions. We work to provide current and accurate information. But some information could have technical inaccuracies or typographical errors. If there's a conflict between current tax law and this information, current tax law will govern.