Idaho State Income Tax Calculator
Calculate your 2026 Idaho state income tax. See your bracket breakdown, effective rate, and how Idaho compares to neighboring states.
Your Tax Inputs
Idaho’s enacted income-tax rate is 5.3%, applied above an indexed liability zero band. The latest Commission liability schedule and instructions verified here are for 2025; the 2026 indexed floor remains unverified. Published federal 2026 basic standard-deduction references are $16,100 single, $32,200 joint and $24,150 head of household, but they do not certify a complete Idaho deduction. Head of household follows the joint group for the liability zero band. Use reviewed 2026 taxable income or actual allowed deductions and, where needed, an independently confirmed same-year liability floor. Building fund tax, other taxes and payments are separate.
Idaho Governor — enacted 5.3% rate, HB 40 · Idaho Tax Commission — liability schedule, latest verified year 2025 · Idaho Tax Commission — income-tax instructions, latest verified year 2025 · Idaho Tax Commission — annual indexation rule, 2024 explanation · IRS — published 2026 federal basic standard deductionsThe annual amount is gross income minus entered pre-tax deductions and modeled federal and state income tax. Monthly and weekly amounts divide it by 12 and 52. These allocations exclude Social Security and Medicare (FICA), local taxes, other payroll taxes, and unmodeled paycheck deductions. They do not estimate paycheck take-home or actual withholding.
Effective State Income Tax Rate vs Neighboring States
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About Idaho state taxes (Tax year 2026)
Idaho’s enacted income-tax rate is 5.3%, applied above an indexed liability zero band. The latest Commission liability schedule and instructions verified here are for 2025; the 2026 indexed floor remains unverified. Published federal 2026 basic standard-deduction references are $16,100 single, $32,200 joint and $24,150 head of household, but they do not certify a complete Idaho deduction. Head of household follows the joint group for the liability zero band. Use reviewed 2026 taxable income or actual allowed deductions and, where needed, an independently confirmed same-year liability floor. Building fund tax, other taxes and payments are separate.
Groceries are taxed at the full state rate. Prescription drugs are exempt.
Idaho's top income tax rate is 5.3% for tax year 2026. Its combined state and local sales tax averages 6.03%.
Filing in Idaho: returns for tax year 2026 are administered by the Idaho State Tax Commission and are generally filed in 2027 by the federal April deadline unless Idaho declares a state-specific extension. Tax type on this return: Flat. Top marginal rate: 5.3%. State sales-tax rate: 6%. For the most current contact info, see the Federation of Tax Administrators directory.
Idaho — What is Idaho's income tax rate? The enacted Idaho income-tax rate is 5.3%. It applies above an annually indexed liability zero band. The latest Commission liability schedule verified here is for 2025, so a complete 2026 liability cannot be certified from the rate alone.
Idaho — Does Idaho tax groceries? Idaho’s general sales tax applies to groceries. A separate food tax credit has eligibility and tax-year rules; its amount is not calculated in this state income-tax model. Verify the applicable year’s allowed credit rather than reusing an older amount.
Idaho — How does Idaho compare to neighboring states? Idaho’s enacted 5.3% income-tax rate alone does not establish an effective tax burden. Neighbor estimates use different deductions and coverage, and this model leaves unresolved 2026 Idaho liability assumptions unavailable. Residency, local taxes and living costs require separate review.
How this page is reviewed
See methodology, assumptions & sources
| Risk tier | High YMYL |
|---|---|
| Author | Calculover Editorial Team Tax education |
| Editorial owner | Calculover Tax & Payroll Desk State-tax methodology owner |
| Reviewer | Calculover Editorial Review Government-source and limitation review |
| Last reviewed | 2026-11-06 |
| Last verified | 2026-11-06 |
| Data effective date | 2026-01-01 |
| Jurisdiction | Idaho |
Methodology
These pages estimate annual state income tax for the selected 2026 jurisdiction and filing status. The route's coverage panel identifies the supported income basis, deductions, credits and exclusions.
Assumptions
- Enter the income basis and eligible pre-tax deductions requested by the calculator; gross wages, federal AGI and state AGI are not interchangeable.
- Some methods require confirmed state facts or explicit projection assumptions. An unavailable component is not zero tax.
Limitations
- The estimate excludes unmodeled income, adjustments, local taxes and special filing situations. Utah's indexed-credit assumptions remain provisional while final 2026 instructions are pending.
- Annual liability differs from withholding and paycheck take-home. Confirm the current official forms and source versions for a complete return.
Sources
- State Tax Rates, Federation of Tax Administrators
- State Individual Income Tax Rates and Brackets, Tax Foundation
- State Government Resources, Internal Revenue Service
Professional guidance: This page is for state-tax education only and is not tax, legal, financial, or investment advice. State tax decisions and multi-state filing should be reviewed with a CPA or enrolled agent licensed in the relevant states.