This isn’t an extension of time to pay your taxes—it’s an extension to file your return.
You automatically get an extension of up to six months to file your return if you’ve paid at least:
• 100% of what you paid for state income taxes the year before or
• 80% of your current year’s tax liability
You can avoid a penalty for late filing, but will be charged interest on the remaining tax until it’s paid.
Complete the worksheet on Form 51 to see if you meet the extension requirements.
To avoid a penalty, pay online at tax.idaho.gov/epay or mail your payment with Form 51 by April 15, 2021. If you qualify for an extension to file your Idaho return, send the return and pay in full by October 15, 2021.