Idaho Individual Income Tax Forms (Tax Year 2025)

Idaho individual income taxes are administered by the
Idaho State Tax Commission.
This page provides official resources for Idaho individual income tax forms for tax year 2025, filed in 2026.

File Idaho Income Tax Online (2025)

Idaho provides electronic filing and payment through its official online system.
Taxpayers can file returns, make payments, and manage accounts using
Idaho Taxpayer Access Point.

Quick Links (Official Idaho State Tax Commission)

The official Idaho State Tax Commission website is available at
Idaho State Tax Commission.

General information about individual income tax is available on the
Idaho individual income tax overview page.

Official Idaho tax forms for all years are available in the
Idaho State Tax Commission forms library.

Idaho Individual Income Tax Forms (2025)

Idaho residents file their state income tax return using
Form 40, Idaho Individual Income Tax Return.

Nonresidents and part-year residents file using
Form 43, Idaho Part-Year Resident and Nonresident Income Tax Return.

Taxpayers who make estimated payments use
Form 51, Idaho Estimated Income Tax Voucher.

An extension of time to file may be requested using
Form 51E.

Previously filed Idaho individual income tax returns may be corrected using
Form 40X, Idaho Amended Individual Income Tax Return.

Idaho Individual Income Tax Deadlines (Tax Year 2025)

Idaho individual income tax returns for tax year 2025 are due April 15, 2026.
Approved filing extensions generally run through October 15, 2026.

Estimated tax payments are generally due on April 15, June 15, September 15, 2026, and January 15, 2027.

Idaho Taxpayer Resources (2025)

Taxpayers can file returns and make payments using
Idaho Taxpayer Access Point.

Additional guidance is available on the
Idaho individual income tax guidance page.

Contact information for the Idaho State Tax Commission is available on the
official contact page.

Disclaimer

This page links to official Idaho State Tax Commission resources for informational purposes only.
Tax laws, forms, and filing requirements may change.
Always verify information on the official Idaho State Tax Commission website.

M. Spik

Editor
25 years of experience managing tax, accounting, payroll, and employment-related information portals. Editor of Accounting Portal since 2011.
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