How to apply for a tax extension
You may be able to get an automatic, six-month extension to file your 2017 Idaho income tax return which is due by April 17 if you can’t file on time.
To qualify, you need to pay an estimated 80% of the tax you owe for 2017, or 100% of the total tax reported on your 2016 income tax return. These payments will need to be made by April 17.
An automatic extension means you don’t have to file a written request.
With a valid extension, you can avoid the late fee penalties, however you will be charged 4% interest annually on the remaining tax until it’s paid.
To see if you qualify, fill out Idaho Form 51, Estimated Payment of Idaho Individual Income Tax.
You can find that form at tax.idaho.gov and in the 2017 Idaho income tax packet.
To make a payment and avoid a penalty:
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 Make a payment at any Tax Commission office
If you qualify for an extension to file, your Idaho return and any extra tax payment must be postmarked by Oct. 15.