Idaho state tax filing

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Idaho tax details

The Idaho Department of Revenue made a few changes for the 2025 tax year.

Idaho now has a flat tax rate of 5.3% for individual returns. For those filing as Married Filing Jointly, Head of Household, or as a Surviving Spouse, all taxable income above $9,622 will be taxed at the flat rate. For those filing as Single or Married Filing Separately, all taxable income above $4,811 will be taxed at the flat rate.

The Idaho Grocery Tax Credit has been renamed and is now called the Idaho Food Tax Credit. The standard version of the Food Tax Credit allows a credit of up to $155 per person claimed on your tax return. The new receipts-based version of this credit can be claimed instead of the standard version. This version allows a credit of up to $250 per person on your tax return, but you must provide receipts documenting the sales tax you paid on eligible food purchases in Idaho during 2025.

Idaho is providing a new Parental Choice Tax Credit for full-year residents with children in nonpublic schools, which helps cover qualifying expenses such as tuition and tutoring. The credit is for up to $5,000 per eligible student or up to $7,500 per eligible student with a qualifying disability. You must apply for this credit with the Idaho Tax Commission and be approved before you can claim it.

2025 Idaho tax forms

These are the supported Idaho state tax forms on FreeTaxUSA:

  • Form 40
    Idaho Individual Income Tax Return

  • Form 43
    Idaho Part-Year Resident & Nonresident Income Tax Return

  • Form 39R
    Idaho Supplemental Schedule: For Form 43, Resident Returns Only

  • Form 39NR
    Idaho Supplemental Schedule: For Form 43, Part-Year Resident & Nonresident Returns Only

  • Form CG
    Idaho Capital Gains Deduction

  • Form ID-VP
    Idaho Income Tax Voucher Payment

  • Form 51
    Estimated Payment of Idaho Individual Income Tax

Frequently asked questions

2025 Idaho filing deadlines

Keep these Idaho state deadlines in mind as you do your taxes.

  • Individual tax returns
    Due by April 15, 2026

  • Idaho tax extension
    If you expect a refund: Automatic 6-month filing extension.
    If you expect to owe taxes: Submit Idaho Form 51 with payment.
    Due by April 15, 2026

  • Income tax payment
    Due by April 15, 2026

  • Tax returns for extension filers
    Due by October 15, 2026

2025 Idaho refunds

Ways to receive your refund

Get your Idaho refund deposited in your bank account, mailed as a check, or put towards next year's Idaho taxes.

Refund status for e-filed tax returns

If you e-filed your Idaho tax return, please allow 7 to 8 weeks to receive your refund.

Refund status for mailed tax returns

If you mailed your Idaho tax return, please allow 10 to 11 weeks to receive your refund.

First-time filers

If this is your first year filing an Idaho tax return, it takes Idaho about 3 weeks to create your account in their system. Until then, returns will be listed as "not entered in system" in the Idaho refund status tool. These 3 weeks are in addition to the processing times listed above.

How to check your refund status

Check your ID refund status online.

Call the Idaho State Tax Commission at (208) 334-7660 in the Boise area or toll-free at (800) 972-7660. Hearing impaired callers can use the Idaho Relay Service at (800) 377-3529.

2025 Idaho state tax payments

Idaho has many income tax payment options. Find the option that works best for you below.

Pay with direct debit

You can use this payment option when you e-file with us.

Pay electronically

Visit the Idaho website after filing to pay the amount you owe. You may pay with a credit card, debit card, or e-check with a fee, or by ACH debit for free.

Pay by mail

If mailing your tax return or e-filing, include Form ID-VP with your check or money order.

All payments are due by April 15, 2026, whether or not an extension was filed.

2025 Idaho extension

An extension extends the time you have to file your return to October 15, 2026. Idaho automatically grants an extension when you meet the payment requirement. There is no additional form to submit.

If you expect a refund from Idaho:

Automatic extension for Idaho.

If you expect to owe Idaho taxes:

You need to pay 80% of your 2025 estimated taxes or 100% of the total tax reported on your 2024 income tax return by April 15, 2026 in order to qualify for the extension.

Idaho prior year taxes

Even though the deadline has passed, you can still prepare Idaho taxes for prior years. Many people who file late tax returns have refunds waiting for them. We'll help you prepare and mail your federal and state tax returns.

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