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  1. Welcome to Idaho State Tax Commission

    Apr 6, 2026 · ISTC informs taxpayers about their obligations so everyone can pay their fair share of taxes, & enforces Idaho’s laws to ensure the fairness of the tax system.

  2. Individual Income | Idaho State Tax Commission

    Aug 21, 2025 · ISTC informs taxpayers about their obligations so everyone can pay their fair share of taxes, & enforces Idaho’s laws to ensure the fairness of the tax system.

  3. Forms and Guides | Idaho State Tax Commission

    Jun 6, 2023 · ISTC informs taxpayers about their obligations so everyone can pay their fair share of taxes, & enforces Idaho’s laws to ensure the fairness of the tax system.

  4. Current Individual Income Tax Forms | Idaho State Tax Commission

    Mar 11, 2026 · Current Individual Income Tax Forms Claiming Conformity Deductions? Claiming conformity deductions on your 2025 income taxes? For Form 40, see line 18 instructions. For Form …

  5. Contact Us | Idaho State Tax Commission

    Feb 2, 2026 · The Idaho State Tax Commission can't guarantee the confidentiality of any information sent via the boxes above. We might review information submitted for quality assurance, or for …

  6. E-Pay | Idaho State Tax Commission

    Feb 27, 2026 · ISTC informs taxpayers about their obligations so everyone can pay their fair share of taxes, & enforces Idaho’s laws to ensure the fairness of the tax system.

  7. Individual Income Tax Refund | Idaho State Tax Commission

    Apr 1, 2026 · Your refund for a 2025 Idaho income tax return could be different than what your return showed due to the conformity bill, which didn’t become law until after tax season started. One …

  8. Mailing Addresses | Idaho State Tax Commission

    Mar 21, 2023 · ISTC informs taxpayers about their obligations so everyone can pay their fair share of taxes, & enforces Idaho’s laws to ensure the fairness of the tax system.

  9. You, the taxpayer/grantor, must complete, sign, and return this form if you want to grant power of attorney to an accountant, tax return preparer, attorney, family member, or anyone else to act on …

  10. All Tax Forms | Idaho State Tax Commission

    Nov 2, 2022 · ISTC informs taxpayers about their obligations so everyone can pay their fair share of taxes, & enforces Idaho’s laws to ensure the fairness of the tax system.