Idaho State Tax Commission

Tax Commission News Release

Oct. 15 deadline nears for taxpayers with filing extensions

BOISE, IDAHO — Oct. 1, 2018 — Time is running out to file 2017 Idaho state income tax returns. The Idaho State Tax Commission says taxpayers who qualified for an automatic extension to file must send in their return and full payment by Oct. 15.

Idaho law allows taxpayers with an extension to avoid a penalty for late filing. But you’ll owe 3-percent interest on any tax that was due and not paid by April 17. 

You can file returns electronically, and you may qualify to file online for free. Visit to learn more. You also can pay your taxes electronically through Use the free Quick Pay option to make a payment without creating an account.   

“We expect to receive about 27,000 individual income tax returns in October,” Tax Commission Chairman Ken Roberts said. 

Taxpayers who are victims of Hurricane Florence have until Jan. 31, 2019, to file their returns if they have a filing extension. They can find more information at

If you need tax help:

Adjust your paycheck withholding

The Tax Commission urges you to review your federal W-4 after you’ve filed your 2017 tax return to ensure that you’re withholding enough 2018 state and federal income taxes from your paycheck.

With significant changes to state and federal tax laws, you could be among many taxpayers who are having too little money withheld from your paychecks to cover the taxes you’ll owe for this year. Visit to learn more.



Posted 10-01-2018
tax pros news release general

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.