Idaho Taxes Pages

Idaho Income Tax Extension

How to file an Idaho Tax Extension. Points to consider when to prepare extensions.

Extension Situation
Extension Suggestion
Idaho Tax Refund

Option 1: If you do not owe Idaho income taxes or expect a ID tax refund by the tax deadline, you do not have to prepare and file a ID tax extension. In case you expect a ID tax refund, you will need to file or e-File your ID tax return in order to receive your tax refund money.

Option 2: eFiled a Federal Extension? If you do not owe Idaho income taxes or expect a tax refund by the tax deadline, your accepted federal extension will be honored as a state extension, and you do not have to mail in Form 51.

Owe Idaho Taxes

Option 1: Pay all or some of your Idaho income taxes online via: Idaho E-Pay.

Option 2: If you owe ID income taxes, you will either have to submit a ID tax return or extension by the tax deadline in order to avoid late filing penalties. You can only eFile and IRS tax extension, but not an Idaho extension. The tax extension will only avoid late filing penalties until the October deadline.
Note: Unless you pay all your Taxes or eFile your tax return by the October deadline, the late filing penalties will start again after that deadline.

Option 3: Complete Form 51, include a Check or Money Order, and mail both to the address on Form 51. Important: Even if you filed an extension, you will still need to file your ID tax return either via eFile or by paper by the October deadline.

Idaho Income Tax Calculator
Idaho Tax Deadlines
Tax Penalties
Important: If you owe Idaho and/or IRS income taxes and do not file an IRS and Idaho tax return or extension by the Tax Due Date, you will be subject to IRS and ID late filing penalties. Estimate IRS late filing, payment penalties. In addition, if you do not pay your taxes by the Tax deadline, you will be subject to late tax payment penalties. Filing an extension on time will ONLY eliminate the late filing penalties but not the late tax payment penalties. Late filing penalties are generally higher than late payment penalties, thus file something on time even if you can't pay anything on time!
Discuss your extension questions and goals with a Taxpert for free and we will guide you through the process.