💵 Idaho Paycheck Calculator

Calculate your Idaho paycheck for 2026 with federal income tax, Social Security, Medicare, and Idaho's 5.3% flat income tax. Idaho retroactively cut the rate from 5.695% to 5.3% via HB 40 (March 2025) effective January 1, 2025, then conformed to the federal One Big Beautiful Bill Act via HB 559 (February 2026), adopting the enhanced federal standard deduction and the OBBB tip and overtime deductions for state purposes.

Your gross pay before any deductions
Number of allowances from W-4 (0 = standard)
401(k) contribution per pay period
Pre-tax health insurance premium per pay period
Health Savings Account contribution per pay period
Extra federal tax withholding per pay period

Inside an Idaho Pay Stub: 5.3% Flat Plus Federal

An Idaho paycheck shows federal income tax, FICA payroll taxes (Social Security at 6.2% on wages up to the cap, Medicare at 1.45% on all earnings plus the 0.9% high-earner surtax above $200,000), and Idaho state income tax via Form ID W-4. The state side is structurally simple: a flat 5.3% rate applied to Idaho taxable income with a federal-conforming standard deduction of $16,100 single, $32,200 married filing jointly, and $24,150 head of household for 2026.

Form ID W-4 and Federal Conformity

Idaho Form ID W-4 follows the post-2020 federal W-4 structure closely — workers can use the federal W-4 directly for Idaho purposes if they choose, with the Idaho Tax Commission applying federal allowance and exemption logic to state withholding. Workers wanting to differ from federal allocations (different filing status for state purposes, additional Idaho-specific deductions) file the separate ID W-4. The simplification was a deliberate 2024 reform meant to reduce paperwork friction for Idaho workers, particularly the Boise tech-sector population that frequently relocates from California, Washington, and Oregon.

From 6.925% to 5.3%: The HB 436 → HB 40 Path

Idaho's 2022 HB 436 began the transition from a seven-bracket progressive structure (top rate 6.925%) to a flat tax. The 2024 first step set the rate at 5.8% flat. HB 1 (2023) reduced to 5.695%. HB 40 (March 2025) further reduced the rate to 5.3% retroactive to January 1, 2025 — making Idaho's rate competitive with neighboring Utah (4.5%) while remaining lower than Oregon (top 9.9%) and California (top 13.3%). The legislative trajectory has been steeply downward, supported by sustained revenue surplus from rapid in-migration and economic growth.

The HB 559 OBBB Conformity

HB 559 (February 2026) conformed Idaho tax law to the federal One Big Beautiful Bill Act, adopting the enhanced federal standard deduction ($16,100 single from $14,600), the $25,000 federal tip income deduction (subject to phase-out at higher incomes), the $12,500 overtime deduction (phasing out for AGI above $150,000 single), and the $10,000 auto loan interest deduction. The conformity matters most for hospitality workers (Sun Valley resort, Boise tourism), shift-heavy roles (Boise hospital, Micron production fabs running 24/7), and middle-income families with auto loan interest. Idaho conforming on a rolling basis avoids the complexity that non-conforming states (California, New York) impose on workers reconciling federal and state taxable income figures.

2026 Federal Math at Idaho Wage Levels

The IRS 2026 inflation adjustments set the standard deduction at $16,100 single, $32,200 married filing jointly, and $24,150 head of household. Marginal federal brackets for single filers run 10% on the first $11,925, 12% to $48,475, 22% to $103,350, 24% to $197,300, continuing upward. Social Security applies at 6.2% to the $184,500 wage base for 2026, and Medicare runs 1.45% with the 0.9% surtax above $200K single.

Sample Paycheck on the State Median ($74,000)

For a single filer at Idaho's median household income of $74,000 per the Census ACS 2024 1-year brief, federal taxable income lands at $57,900 after the federal standard deduction. Federal tax sums to roughly $8,219 ($1,193 at 10%, $4,386 at 12%, $2,084 at 22%). FICA at 7.65% removes another $5,661. Idaho state tax (5.3% × $57,900 Idaho taxable, with the $4,811 personal exemption) lands near $2,816. Total annual deductions of about $16,696 produce $57,304 in annual take-home pay, a 77.4% retention rate. Biweekly that works out to roughly $2,204 net.

The Micron Boise Wage Premium

A senior process engineer at Micron Technology's Boise headquarters and fab campus, a senior systems engineer at HP Boise, or a research scientist at the Idaho National Laboratory earning $145,000 single takes home approximately $103,500 — about $3,981 biweekly — after $23,433 federal income tax, $11,092 FICA, and $7,032 Idaho state tax. The same role at Intel Hillsboro Oregon would pay roughly $148,000 base but lose 9.9% to Oregon's top rate plus the Multnomah/Metro local taxes — narrowing net pay materially in Idaho's favor. Micron's announced $15B Boise fab expansion (DRAM memory) plus the existing 6,500-employee Boise campus has driven sustained tech wage growth across the Treasure Valley.

Micron, INL, and the Boise Tech Boom

Idaho's economy has shifted dramatically over the past decade from a primarily agricultural and forest-products base to a tech-and-federal-research-driven Treasure Valley cluster.

The Micron Headquarters and $15B Fab Expansion

Micron Technology's Boise headquarters anchors the largest semiconductor footprint in the Mountain West, employing roughly 6,500 in Boise across DRAM/NAND memory engineering, equipment engineering, process technology, and corporate functions. Micron announced a $15 billion expansion in 2022 (originally targeted for 2025-2030) bringing potential employment to 12,000+ at full ramp. Senior process engineers earn $130K-$200K, equipment engineers $115K-$170K, and senior managers $185K-$280K. The Micron wage tier combined with Idaho's 5.3% flat rate and 0.67% property tax produces materially better disposable income than comparable roles at Intel Hillsboro (Oregon 9.9% top rate) or TSMC Phoenix (Arizona 2.5% flat but higher cost of living in central Phoenix).

Idaho National Laboratory and the Federal Research Cluster

Idaho National Laboratory (INL) in Idaho Falls (eastern Idaho) employs roughly 5,300 across nuclear energy research, advanced reactor design, cybersecurity infrastructure, and national security applications. The INL operates 50+ test reactors and the Advanced Test Reactor — the largest test reactor complex in the world — under contract to the Department of Energy. Senior nuclear engineers earn $140K-$210K base, with classified-cleared roles adding 10-15% for clearance premium. Combined with the Idaho Falls cost of living (substantially below Boise), INL workers achieve some of the highest real disposable incomes in the federal research community.

Idaho Property Tax: 0.67% Effective

Idaho's effective property tax rate of 0.67% sits well below the national average and below neighboring Oregon (0.93%) and Washington (0.84%). The structural cause traces to two factors: Idaho's constitutional property tax limit (the 1% base levy from the 1978 House Joint Resolution) and the homeowner exemption ($125,000 or 50% of assessed value, whichever is less, for primary residences). For a homeowner at the Idaho median home value of $440,000, annual property tax runs roughly $2,950 after the homeowner exemption.

Ada County (Boise) vs Bonneville County (Idaho Falls) vs Kootenai (Coeur d'Alene)

Idaho's 44 counties operate independent property tax structures within the constitutional cap. Ada County (Boise metro) effective rate runs 0.67%, Canyon County (Nampa-Caldwell) 0.62%, Bonneville County (Idaho Falls) 0.62%, Bannock County (Pocatello) 0.71%, Kootenai County (Coeur d'Alene) 0.65%, and rural counties as low as 0.45%. The county-level variation matters less than mainland states because of Idaho's low absolute property tax rates, but workers comparing offers between Boise and Idaho Falls or Coeur d'Alene should explicitly include the property tax line plus the differential cost-of-living impact.

Three Wage Realities: Boise Tech, Idaho Falls Federal, Sun Valley Hospitality

The same federal-plus-Idaho 5.3% math produces dramatically different lifestyles depending on the metro and role.

Boise Micron Senior Process Engineer, $165,000

A senior process engineer at Micron Boise, a senior systems engineer at HP Boise, or a senior researcher at Boise State University earning $165,000 single takes home approximately $114,000 — about $4,385 biweekly — after $26,950 federal income tax, $12,062 FICA, and $8,225 Idaho state tax (after federal-conforming $16,100 standard deduction). Ada County median home near $545,000 with the 0.67% property tax produces PITI of roughly $4,200/month — comfortable on this senior tech wage tier, though Boise's rapid 2020-2024 home price appreciation (driven by California and Washington in-migration) has narrowed the affordability advantage versus Phoenix or Salt Lake City. The 5.3% flat tax remains the structural pull factor relative to Oregon (9.9% top), Washington (capital gains tier), or California (13.3% top).

Idaho Falls INL Senior Nuclear Engineer, $155,000

A senior reactor engineer at INL, a cybersecurity researcher at the Critical Infrastructure Test Range, or a senior systems engineer at Battelle Energy Alliance earning $155,000 single (with classified clearance premium) takes home approximately $109,000 — about $4,192 biweekly — after $25,250 federal income tax, $11,500 FICA, and $7,690 Idaho state tax. Bonneville County (Idaho Falls) median home near $375,000 with 0.62% property tax produces PITI of roughly $2,800/month — substantially more affordable than Boise on a comparable wage. The combination of low cost of living, the INL federal research environment, and the 5.3% flat rate produces among the highest real disposable incomes available to nuclear and cybersecurity engineers in the United States.

Sun Valley Resort Worker, $52,000

A ski instructor at Sun Valley Resort, a hospitality worker at the Sun Valley Lodge, or a tour operator at Smiley Creek earning $52,000 single (with seasonal shift differential) takes home approximately $42,500 — about $1,635 biweekly — after $4,729 federal income tax, $3,978 FICA, and $2,756 Idaho state tax. Blaine County (Sun Valley) median home over $1,800,000 places traditional homeownership entirely out of reach on this wage tier — most resort workers live in down-valley Hailey, Bellevue, or Ketchum apartments. The 5.3% flat rate combined with no sales tax on groceries provides modest relief, but the Sun Valley housing affordability crisis is the dominant economic challenge for service-tier workers in Blaine County. The OBBB tip deduction (up to $25,000 federal) plus Idaho's conformed deduction provides meaningful relief for tipped workers.

Idaho Tax Planning Moves for 2026

Three planning moves matter most for Idaho workers under the 5.3% flat regime. First, take advantage of Idaho's federal-conforming standard deduction. The OBBB-aligned $16,100 single ($32,200 joint) standard deduction is now identical to federal — workers do not need separate Idaho-specific itemization unless they have substantial state-and-local taxes paid that exceed the standard. The Idaho personal exemption of $4,811 ($9,622 joint) stacks on top, providing an additional $255 in tax savings for a single worker.

Second, claim the Idaho Grocery Credit. Idaho is one of few states still imposing sales tax on groceries (6%), but offers a Grocery Credit of $120 per person ($140 for residents 65+) to offset. The credit is claimed on the Idaho Form 40 annual return and is refundable — even non-tax-owing low-income workers receive the full credit as a refund. For a family of four, the annual Grocery Credit totals $480, materially offsetting the Idaho grocery sales tax burden.

Third, model the Idaho-vs-neighbors math when considering relocation or evaluating offers. The Idaho Mortgage Calculator handles property tax mechanics for Ada, Canyon, Bonneville, Kootenai, and rural counties separately. The Idaho Affordability Calculator integrates the income tax and property tax sides; the Idaho financial calculators hub bundles paycheck, mortgage, and affordability tools. For federal-only mechanics including FICA and OBBB tip and overtime deductions ($25K tip / $12.5K overtime exemptions for 2026-2028), the national Paycheck Calculator provides verification.

Frequently Asked Questions

How does Idaho's 5.3% flat rate compare to neighboring states?
Idaho's 5.3% flat rate sits favorably between low-tax neighbors (Wyoming 0%, Nevada 0%, Washington 0% on wages but 7-9.9% on capital gains) and higher-tax neighbors (Oregon 9.9% top, Montana 5.65% post-reform). The closest peer is Utah's 4.5% flat — Idaho's 5.3% sits slightly above. The structural advantage of Idaho versus Oregon for tech workers is dramatic: a $145,000 software engineer at Micron Boise saves roughly $6,700 annually in state tax versus the equivalent role at Intel Hillsboro Oregon (which pays 9.9% top plus Multnomah Metro/PFA/Arts Tax stack reaching effective 12-13% for some Portland workers). The HB 40 (March 2025) cut from 5.695% to 5.3% reflects sustained revenue surplus from rapid in-migration and economic growth — particularly Micron's ongoing $15B Boise expansion.
How does HB 559 OBBB conformity affect Idaho take-home pay?
HB 559 (February 2026) conformed Idaho tax law to the federal One Big Beautiful Bill Act, adopting the enhanced federal standard deduction ($16,100 single from $14,600), the $25,000 federal tip income deduction (subject to phase-out at higher incomes), the $12,500 overtime deduction (phasing out for AGI above $150,000 single), and the $10,000 auto loan interest deduction. For Idaho workers, the conformity means these deductions reduce both federal AND Idaho taxable income — the state tax savings on a maxed $25,000 tip deduction runs roughly $1,325 (5.3% × $25,000), in addition to the federal savings. Idaho conforming on a rolling basis avoids the complexity that non-conforming states (California, New York, Massachusetts) impose on workers reconciling federal and state taxable income figures separately on the Idaho return.
What's the Micron Boise wage premium really worth?
Micron Technology's Boise headquarters and fab campus pays among the highest semiconductor wages in the Mountain West, with senior process engineers earning $130K-$200K, equipment engineers $115K-$170K, and senior managers $185K-$280K. The combined effect of the Micron wage tier plus Idaho's 5.3% flat rate plus 0.67% effective property tax produces materially better disposable income than comparable roles at Intel Hillsboro Oregon (9.9% top state rate plus Multnomah/Metro/PFA/Arts Tax stack), at TSMC Phoenix Arizona (2.5% flat is lower but Phoenix housing inflation has narrowed the cost-of-living advantage), or at Samsung Austin Texas (no income tax but 1.49% Texas property tax). For a $145K Micron senior process engineer, total state-and-local tax burden runs roughly $7,032 in Idaho versus $13,400 in Oregon — a $6,400 annual delta favoring Boise. Micron's announced $15B Boise expansion (originally 2025-2030) is bringing potential employment to 12,000+ at full ramp.
How does the Idaho National Laboratory affect Idaho Falls wages?
Idaho National Laboratory (INL) in Idaho Falls is the largest federal research employer in the Mountain West, with roughly 5,300 workers across nuclear energy research, advanced reactor design, cybersecurity infrastructure, and national security applications. The INL operates 50+ test reactors including the Advanced Test Reactor — the largest test reactor complex in the world — under contract to the Department of Energy through Battelle Energy Alliance. Senior nuclear engineers earn $140K-$210K base, with classified-cleared roles adding 10-15% for clearance premium. Combined with Idaho Falls cost of living (substantially below Boise — median home $375K versus Boise $545K) and the 5.3% flat rate, INL workers achieve among the highest real disposable incomes in the federal research community. The cluster also supports a robust subcontractor ecosystem (CWI, NorthWind Group, Premier Technology) employing another 2,500-3,500 in eastern Idaho.
Does Idaho really have no sales tax on groceries?
Idaho is one of the few states still applying full sales tax to groceries (6% statewide), but offers a Grocery Credit of $120 per person ($140 for residents 65+) on the annual income tax return to offset. The credit is refundable — even non-tax-owing low-income workers receive the full credit as a tax refund. For a family of four, the annual Grocery Credit totals $480, which roughly offsets the average household's grocery sales tax burden ($600-$800/year). The structure is unusual: rather than exempting groceries from sales tax (the approach in 37 other states), Idaho keeps the broad sales tax base and provides relief through the Grocery Credit. The trade-off is administrative simplicity for retailers but additional friction for consumers who must claim the credit annually. Workers should ensure they claim the Grocery Credit when filing — the credit is claimed on Idaho Form 40 line 47.
How does Boise's rapid growth affect housing costs and take-home pay math?
Boise has experienced one of the fastest housing price appreciation rates in the United States from 2020-2024, driven by California and Washington in-migration. Median home values in Ada County rose from roughly $290,000 in 2019 to $545,000 in 2026 — an 88% increase in 7 years. The appreciation has narrowed Idaho's historical cost-of-living advantage relative to West Coast peers; while a Boise home is still cheaper than San Francisco ($1.4M median) or Seattle ($830K), the gap is much smaller than a decade ago. The 5.3% flat tax remains the structural pull factor for tech workers relocating from Oregon (9.9% top), California (13.3% top), or Washington (capital gains 7-9.9% post-2025 reform). Workers comparing offers should weight the cost-of-living adjusted income carefully, particularly in the Treasure Valley where housing prices continue rising at 3-5% annually as of 2026.