Idaho Paycheck Calculator 2026 — Flat 5.7% State Rate (Federal + FICA + State)
Drop your Idaho gross salary — get annual + monthly + bi-weekly take-home, full breakdown of federal + FICA + Idaho state tax, effective rate, and how you compare to the Idaho median household. Includes 2026 Idaho brackets from the Idaho State Tax Commission.
- Instant result
- Private — nothing saved
- Works on any device
- AI insight included
Idaho Paycheck Calculator
You might also need
- careerWashington Paycheck Calculator~14K/month · $9-15 CPC (state-paycheck cluster)
- careerOregon Paycheck Calculator~14K/month · $9-15 CPC (state-paycheck cluster)
- careerMontana Paycheck Calculator~14K/month · $9-15 CPC (state-paycheck cluster)
- careerSalary to Hourly Calculator500K+/month
- careerSalary Negotiation Counter-Offer Calculator20K+/month
How much do I take home in Idaho? — short answer first
Idaho transitioned from a 4-bracket progressive income tax (1-6.5%) to a flat 5.695% rate under HB 521 (2023), effective tax year 2024+. The standard deduction conforms to federal ($14,600 single / $29,200 joint, indexed). Idaho has no local income tax, and property tax is among the lowest in the US (~0.49% effective). The flat-rate adoption simplified Idaho filing while maintaining a competitive position relative to peers like Utah (4.45% projected) and Montana (5.9% projected). Idaho has no reciprocity agreements — Washington commuters (no income tax) and Oregon commuters (high tax) face full ID rates on Idaho-source wages.
The Idaho take-home pay formula
net_pay = gross − federal_tax − fica − state_tax − local_tax − pre_tax
federal_tax = Σ (federal_bracket × rate) on (gross − std_dev − 401k − hsa)
fica = MIN(wages, $181K) × 6.2% + wages × 1.45% + add'l Medicare
state_tax = Σ (bracket_amount × bracket_rate) // top rate 5.70% in Idaho
local_tax = 0 // no local payroll tax in IdahoThe 2026 take-home calculation for Idaho stacks four mandatory deductions: federal income tax (7-bracket progressive), FICA (Social Security capped at $181K + uncapped Medicare), Idaho state income tax (1-bracket progressive, top rate 5.70%). Pre-tax 401(k) and HSA reduce federal taxable income; HSA additionally reduces FICA wages.
Source:Idaho State Tax Commission — flat 5.695% individual income tax (post-HB 521)· Idaho Department of Revenue (or equivalent)
How Idaho taxes payroll in 2026
Idaho levies a flat 5.695% individual income tax under Idaho Code §63-3024A, effective tax year 2024+ per HB 521 (2023). The legislation collapsed Idaho's previous 4-bracket progressive structure (1%, 3%, 4.5%, 6.5%) into a single flat rate. The 5.695% rate is permanent in state code — not subject to revenue triggers like neighbouring Utah or Montana. The flat-rate adoption was the culmination of multi-year tax reform in Idaho; prior to HB 521, the state had progressively flattened its schedule from 7 brackets (2017) to 4 brackets (2022) to a single rate (2024). The 5.695% rate is materially higher than typical flat-tax peers — Utah (4.45% projected 2026), Indiana (2.95% projected 2026), Kentucky (3.5% projected 2026), and Michigan (4.25% permanent). Idaho's competitive position depends on the federal-conforming standard deduction: $14,600 single / $29,200 joint (2024, with annual inflation indexing to ~$15,000 / $30,000+ for 2026). This makes Idaho's effective tax burden on middle-income filers competitive with flat-tax peers despite the higher headline rate. There is no local income tax anywhere in Idaho — Boise, Coeur d'Alene, Idaho Falls, and Twin Falls all fund services through property tax (effective rate ~0.49% statewide — among the lowest in the US) and 6.6% combined sales tax average (6% state + ~0.6% local). Idaho's property tax is significantly lower than neighbouring Oregon (~0.86%) and Washington (~0.93%), which contributes to its competitive overall tax position. Idaho has no reciprocity agreements with any neighbouring state. Washington commuters working in Idaho (no income tax in WA but ID employer withholds at 5.695%) pay the full Idaho rate on Idaho-source wages. Oregon commuters working in Idaho pay both ID tax + claim a credit on the OR return. Cross-border workers should consult a CPA for the OR-ID corridor; the lack of reciprocity creates dual-filing friction.
Idaho state income tax brackets (single filer, 2026)
| Taxable income up to | Marginal rate |
|---|---|
| Above prior threshold | 5.70% |
Standard deduction (single): $14,600 · top marginal rate 5.70%. Married filing jointly + head of household brackets follow the same shape with adjusted thresholds.
Idaho city callouts
- Boise — Property tax ~0.65% effective (slightly above ID average); combined sales tax 6.6%; tech (HP + Micron) + state government anchor; explosive growth post-2020.
- Coeur d'Alene — Property tax ~0.55% effective; combined sales tax 6.6%; popular WA-state-tax-flight destination; Spokane-area commuters drive cross-border friction.
How to use this calculator
- Enter your annual gross salary. Pre-tax, what your employer pays before any deductions.
- Pick filing status. Single, married filing jointly, married filing separately, or head of household. Drives both federal and Idaho brackets.
- Add 401(k) and HSA contributions (optional). Both lower your federal taxable income; HSA also lowers FICA wages.
- Read the verdict. Annual + monthly + bi-weekly take-home, federal + state + local breakdown, and effective tax rate.
Common mistakes
- Confusing gross with adjusted gross. The calculator wants your gross salary — what your employer pays before any pre-tax deductions or contributions. If you enter your W-2 Box 1 (already net of 401k), the math will under-count your tax.
- Forgetting that 401(k) is still subject to FICA. Traditional 401(k) reduces federal income tax but NOT Social Security + Medicare. Only HSA (through payroll) reduces both.
- Using the wrong filing status for state tax. Idaho uses the same filing status categories as the IRS, but bracket thresholds differ from federal. Pick the status that matches your actual tax filing — not just what gives the best number.
- Ignoring multi-state implications. If you work in Idaho but live elsewhere (or vice versa), you may owe taxes in both states with a credit between them. This calculator assumes you both live and work in Idaho.
US payroll terminology — quick reference
Eight terms that show up on every payslip. Skim the snippet; expand the card for the longer explanation. Same terms apply across all 51 state-paycheck calculators — only the Idaho state line in each formula changes.
Quick reference
Payroll terminology — applies to Idaho
Gross Salary
The headline number from your offer letter, before any deductions. The starting point for every paycheck calculation.
- Lenders, landlords, and benefit calculations use gross. Always confirm whether a quoted figure is gross or net — the gap is typically 25-40% in the US once federal + FICA + state are stacked.
Net Take-Home Pay
What lands in your bank account after federal + FICA + state + local + pre-tax deductions. The number to budget against.
- For Idaho: gross − federal − FICA − Idaho state income tax − 401(k) − HSA.
FICA
Federal Insurance Contributions Act — payroll tax funding Social Security (6.2% to $181K) + Medicare (1.45%, no cap). 7.65% combined.
- Additional Medicare 0.9% applies above $200K single / $250K MFJ. Thresholds frozen since 2013, so an increasing share of earners hit it each year. HSA contributions (but NOT 401k) reduce FICA wages.
Source: SSA — Wage base & tax rates
Marginal Tax Rate
The rate applied to your NEXT dollar of income. Drives the cost of a raise, bonus, or extra 401(k) contribution.
- In Idaho, your combined marginal rate stacks federal (12-37%) + FICA (1.45-2.35%) + Idaho state (5.7%-5.7%). A six-figure earner often faces a 35-45% marginal rate.
Effective Tax Rate
Total tax divided by gross income. The actual percentage of your salary that disappears to tax — always lower than marginal.
- Two earners at the same gross can have different effective rates depending on pre-tax contributions. Use effective rate for affordability comparisons; use marginal for raise / bonus decisions.
Standard Deduction
Fixed amount subtracted from gross before federal brackets apply. 2026: $15,750 single · $31,500 MFJ · $23,625 HoH.
- Idaho's state standard deduction (single) is $14,600 — applied independently before state brackets. Federal and state standard deductions stack; you do not have to itemize on one to claim the other.
Source: IRS Rev. Proc. 2024-40
Pre-Tax Deductions
Amounts subtracted from gross BEFORE income tax is computed — 401(k), traditional IRA via payroll, HSA, FSA, employer health premiums.
- Reduces federal taxable income dollar-for-dollar. HSA also reduces FICA wages (the 'triple advantage'). Traditional 401(k) reduces federal tax but NOT FICA — Roth 401(k) reduces neither but grows tax-free.
Idaho State Tax
Progressive 1-bracket state income tax. Top rate 5.70%. Filed on Idaho State Tax Commission.
- Brackets refresh annually — most state DORs publish updates in Q4 preceding the tax year. Idaho's structure is a flat rate, with separate filing-status schedules for MFJ and HoH.
Source: Idaho State Tax Commission — flat 5.695% individual income tax (post-HB 521)
Methodology & Sources
Federal income tax + FICA: IRS Pub 15-T 2026 projected brackets + Social Security Administration 2026 wage base ($181,000) + Medicare 1.45% (no cap) + Additional Medicare 0.9% above $200K/$250K thresholds. Idaho state income tax: Idaho State Tax Commission — flat 5.695% individual income tax (post-HB 521) — last verified 2026-05-13. Brackets refresh annually — most state DORs publish updates in Q4 preceding the tax year. Federal 2026 figures are projected from 2025 (Rev. Proc. 2024-40) with ~2.5% inflation adjustment; refresh against IRS October release.
Frequently asked questions
When did Idaho become a flat-tax state?
Idaho transitioned to a flat 5.695% rate effective tax year 2024, under HB 521 (2023). The legislation collapsed Idaho's previous 4-bracket progressive structure (1%, 3%, 4.5%, 6.5%) into a single rate. The 5.695% rate is permanent in state code — not subject to annual revenue triggers like Utah or Montana phase-down schedules.
Why is Idaho's flat rate higher than Utah or Indiana?
Idaho's 5.695% rate is higher than peer flat-tax states because Idaho's overall revenue burden is supported less by sales tax (6.6% combined avg) and property tax (~0.49% — among lowest in US) than Utah or Indiana. The trade-off: lower local taxes, higher income tax. Combined effective rates on $75K-$150K earners are competitive with the lower-flat-rate peers when property + sales tax are included.
Are there any local income taxes in Idaho?
No — Idaho has no local income tax at any city or county level. Boise, Coeur d'Alene, Idaho Falls, and Twin Falls all fund services through property tax (effective ~0.49% statewide — among the lowest in the US) and 6.6% combined sales tax average (6% state + ~0.6% local). Property tax is significantly lower than Oregon or Washington.
I live in Washington but work in Coeur d'Alene Idaho — what do I pay?
Idaho state tax (5.695%) on wages earned in Idaho — there is no ID-WA reciprocity. Submit Form 39NR to claim non-resident filing. Washington has no income tax so no offsetting credit, but you also don't double-pay. Net rate is full Idaho 5.695% on Idaho-source wages, plus the WA Cares + PFML (1.32%) on the same wages if your employer is Washington-based.
Want to compare Idaho take-home pay against another state? Use the national take-home pay calculator with a flat-rate state input. To see what you'd save by changing your 401(k) contribution, drop the gross salary into the salary-to-hourly calculator. For cost-of-living adjustments when comparing jobs across states, the cost of living calculator adjusts for housing + groceries + tax differences between metros.
Frequently Asked Questions
The most common questions we get about this calculator — each answer is kept under 60 words so you can scan.
What's the effective tax rate in Idaho on a $100K single salary in 2026?
A $100,000 single filer in Idaho pays roughly $13,841 federal income tax + $7,650 FICA + ~$4,864 Idaho state tax = $26,355 total → 26.4% effective rate. Idaho standard deduction $14,600. Local + 401(k) reductions change this — use the calculator above for an exact verdict.Has Idaho changed its tax rates recently?
Yes — Idaho's tax structure has been on a multi-year phase-down trajectory; the current 5.7% rate (2026 projected) is the result of recent legislative reform. Future-year reductions are typically conditional on revenue triggers. The calculator's brackets reflect the latest published or projected values, last verified 2026-05-13. Always confirm against Idaho State Tax Commission for filing.When did Idaho become a flat-tax state?
Idaho transitioned to a flat 5.695% rate effective tax year 2024, under HB 521 (2023). The legislation collapsed Idaho's previous 4-bracket progressive structure (1%, 3%, 4.5%, 6.5%) into a single rate. The 5.695% rate is permanent in state code — not subject to annual revenue triggers like Utah or Montana phase-down schedules.Why is Idaho's flat rate higher than Utah or Indiana?
Idaho's 5.695% rate is higher than peer flat-tax states because Idaho's overall revenue burden is supported less by sales tax (6.6% combined avg) and property tax (~0.49% — among lowest in US) than Utah or Indiana. The trade-off: lower local taxes, higher income tax. Combined effective rates on $75K-$150K earners are competitive with the lower-flat-rate peers when property + sales tax are included.Are there any local income taxes in Idaho?
No — Idaho has no local income tax at any city or county level. Boise, Coeur d'Alene, Idaho Falls, and Twin Falls all fund services through property tax (effective ~0.49% statewide — among the lowest in the US) and 6.6% combined sales tax average (6% state + ~0.6% local). Property tax is significantly lower than Oregon or Washington.I live in Washington but work in Coeur d'Alene Idaho — what do I pay?
Idaho state tax (5.695%) on wages earned in Idaho — there is no ID-WA reciprocity. Submit Form 39NR to claim non-resident filing. Washington has no income tax so no offsetting credit, but you also don't double-pay. Net rate is full Idaho 5.695% on Idaho-source wages, plus the WA Cares + PFML (1.32%) on the same wages if your employer is Washington-based.