Idaho has a 5.3% flat income tax on all income for 2026, applying the same rate to everyone regardless of income level. This makes Idaho's tax structure simple and competitive among Mountain West states. At $100K income, you pay $4,192 state tax (4.19% effective rate) — lower than Oregon ($7,147), Utah ($4,450), Montana ($4,289) and lower than its own prior rate. Higher than Wyoming (0%), Nevada (0%), and Washington (0%).
Flat tax replaced the progressive brackets: Idaho's 2022 rate schedule still had four brackets (1%, 3%, 4.5% and 6%); from tax year 2023 the state uses a single flat rate above a small zero-rate bracket, 5.8% for 2023, 5.695% for 2024 and 5.3% for 2025. The legislature's goal was to simplify tax filing (no more bracket calculations) and compete with neighboring 0% tax states (WY, NV, WA) for California refugees fleeing high taxes. House Bill 40, signed in March 2025, cut the rate from 5.695% to 5.3% starting with tax year 2025, and 5.3% still applies for 2026. Education advocates watch state revenue closely.
How it compares regionally:
The tradeoff - Boise boom strains infrastructure despite moderate tax: Idaho's 5.3% flat tax generates approximately $2.0B annual revenue (2026 projection), but the state's explosive population growth (2nd-fastest US 2010-2020 at +17.3%, behind only Utah) strains infrastructure. Boise metro grew from 617K (2010) to 765K (2020) = +24% in one decade, driven by California refugees (estimated 75K Californians moved to ID 2010-2020, largest single-state inflow). This creates infrastructure deficit: I-84 congestion (Boise commute times up 40%), school overcrowding (Boise needs 15 new schools by 2030), housing shortage (Boise median home $535K, up from $210K in 2015). Idaho maintains its flat 5.3% rate to fund infrastructure ($1.8B K-12 education, $850M Medicaid, $650M transportation) without raising taxes (would discourage California migration = economic engine). ID ranks 43rd in K-12 education spending per student ($8,985 vs $14,347 national average), 35th in healthcare quality, 21st in infrastructure - lower-middle outcomes due to growth outpacing revenue.
The California question - Boise as 'Silicon Valley escape valve': Idaho's 5.3% flat tax is central to attracting California refugees. At $150K tech salary: CA tax $9,561 (6.37% effective) vs ID tax $6,842 (4.56% effective) = ID saves $2,719/year. Add: Boise housing $535K vs San Jose $1.5M ($965K cheaper), ID no capital gains surtax (CA 13.3% on $1M+ income), lower cost of living (groceries 15% cheaper, gas $1/gallon less). Trade-offs: Boise wages 20-30% lower than Bay Area (Micron engineer $110K ID vs $150K CA, but housing savings compensate), limited public transit (need car), conservative politics (ID legislature 80% Republican vs CA 75% Democrat = culture shock for some). Estimated 75K Californians in ID (2010-2020), driving tech sector growth (Micron $15B investment, HP R&D, Clearwater Analytics IPO $1.4B valuation 2021).
Here's what Idaho residents actually pay at different income levels (2026, single filer, standard deduction):
| Annual Income | Federal Tax | State Tax | Total Tax | Take-Home Pay | Effective Rate |
|---|---|---|---|---|---|
| $50,000 | $3,820 | $1,542 | $9,187 | $40,813 | 18.4% |
| $75,000 | $7,670 | $2,867 | $16,275 | $58,725 | 21.7% |
| $100,000 | $13,170 | $4,192 | $25,012 | $74,988 | 25.0% |
| $150,000 | $24,734 | $6,842 | $43,051 | $106,949 | 28.7% |
| $250,000 | $51,304 | $12,142 | $78,510 | $171,490 | 31.4% |
Note: Includes federal and state income tax only. Does not include FICA (Social Security/Medicare), which adds 7.65% for employees.
Key takeaway: At $100K, Idaho takes $4,192 in state tax alone.
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Migration Trends: According to U.S. Census Bureau data (2021-2022), Idaho experienced net immigration of 19,870 residents (2nd-highest % nationally after Florida). Top origin states were:
Outflow: Idaho lost residents to:
Why people move to Idaho: Affordable housing (Boise $535K, Twin Falls $380K, Idaho Falls $420K vs Bay Area $1.5M, Seattle $850K, Portland $560K), 5.3% flat tax (saves vs CA 9.3-13.3%, OR 9.9%, but costs vs WA 0%), California exodus (75K Californians moved 2010-2020, seeking lower taxes + red-state politics + outdoor lifestyle), tech boom (Micron $15B Boise investment creating 17K jobs, HP R&D, Clearwater Analytics), outdoor recreation (Sun Valley skiing, Craters of the Moon, Yellowstone gateway, Boise Greenbelt, Sawtooth Mountains), conservative politics (ID legislature 80% Republican, 'last bastion' vs West Coast liberalism), safe (8th-lowest crime rate nationally), excellent schools in wealthy suburbs (Eagle, Meridian rank top 10% nationally).
Why people leave Idaho: Lower salaries (ID median $66K vs CA $84K, WA $90K, OR $76K - 15-35% gap), limited career growth outside Boise (tech sector concentrated in Boise metro, rural ID has few professional jobs), rapid housing inflation (Boise $535K up from $210K 2015 = +155% in 10 years, outpacing wages), culture clash (California transplants change politics/culture, sparking 'Don't California My Idaho' backlash from locals), limited urban amenities (Boise 765K metro feels small, Portland 2.5M/Seattle 4M are 6-8hrs away), harsh winters (Boise 20°F January, northern ID -10°F), air quality (summer wildfire smoke from OR/CA wildfires, Boise AQI 150+ 'unhealthy' 30+ days/year).
Tax considerations if moving here: ID residency = 270+ days in state OR domicile test (ID aggressively audits California residents claiming ID residency - selling CA home, canceling CA driver's license, registering vehicles in ID required to prove move). 5.3% state tax on ID taxable income (federal AGI minus $16,100 standard deduction single 2026), applied above a small zero-rate bracket ($4,811 single in the 2025 schedule; 2026 amount not yet published). Simple: (taxable income − $4,811) × 0.053 = tax. Sales tax 6% state + 0-3% local (Boise 6%, rural 6%) = moderate. Property tax 0.54% average (EXCELLENT - $2,889/year on $535K Boise home, 7th-lowest nationally). No tax on Social Security at any age (excellent for retirees). Retirement income (pensions/401k/IRA) FULLY TAXED at 5.3% flat rate. Food Tax Credit (refundable; $155 per person for 2025, or actual food sales tax paid up to $250 each). Result: ID structure favors homeowners (ultra-low 0.54% property tax saves $2-4K/year vs CA 0.70% + OR 0.81%) and retirees (SS exempt, 5.3% on pensions), disadvantages high earners $250K+ (5.3% flat rate, but still beats CA 9.3%+).
| State | Tax Rate | Tax on $100K Income | Difference from Idaho |
|---|---|---|---|
| Idaho | 5.3% flat | $4,192 | Baseline |
| Wyoming | 0% | $0 | −$4,192 (less tax) |
| Nevada | 0% | $0 | −$4,192 (less tax) |
| Utah | 4.45% flat | $4,450 | +$258 (more tax) |
| Montana | 4.7-5.65% | $4,289 | +$97 (more tax) |
Key insight: Idaho's 5.3% flat tax is higher than some Mountain West neighbors. At $100K income, ID is $258 cheaper than Utah ($4,450) and $4,192 more expensive than WY/NV (0%). However, Idaho's ULTRA-LOW property tax (0.54% average) and explosive job growth (Boise tech boom, Micron $15B investment) offset the income tax. At $100K + $535K Boise home: ID pays $4,192 income + $2,889 property (0.54%) + $3,000 sales (6%) = $10,081 total (10.1%). Utah (Salt Lake City $580K): $4,450 income + $2,784 property (0.48% × $580K) + $3,195 sales (6.85%) = $10,429 (10.4%). Result: Idaho's total burden (10.1%) is slightly LOWER than UT (10.4%) — Utah's property tax rate (0.48%) is lower than Idaho's (0.54%), but Utah's income tax at $100K ($4,450) is $258 higher than Idaho's ($4,192), which more than offsets it.
Total tax burden at $100K + median home: Idaho (Boise $535K): $4,192 income + $2,889 property (0.54%) + $3,000 sales (6%) = $10,081 total (10.1%). Wyoming (Cheyenne $350K): $0 income + $1,855 property (0.53% × $350K) + $2,625 sales (5.5%) = $4,480 (4.5%). Nevada (Reno $550K): $0 income + $2,750 property (0.50% × $550K) + $4,125 sales (8.25%) = $6,875 (6.9%). Utah (SLC $580K): $4,450 income + $2,784 property (0.48%) + $3,195 sales (6.85%) = $10,429 (10.4%). Montana (Bozeman $720K): $4,289 income + $4,392 property (0.61% × $720K) + $0 sales (0%) = $8,681 (8.7%). Result: Idaho's 10.1% burden is the SECOND-highest of the five states compared here — only UT (10.4%) is higher; MT (8.7%), NV (6.9%), and WY (4.5%) are all lower. The 'ultra-low 0.54% property tax offsets Idaho's income tax' framing doesn't hold up against WY, NV or MT, and Utah's property tax rate (0.48%) is actually lower than Idaho's. Structure: ID 5.3% income tax is NOT meaningfully offset by property tax savings vs most neighbors.
The Wyoming question — Should I move to WY (0% tax) or ID (5.3% tax + Boise jobs)? At $100K: WY saves $4,192 income tax. BUT: Boise jobs (Micron, HP, tech startups) pay 20-30% more than WY jobs (Boise median $66K vs Cheyenne $58K = +14% wages). Boise $535K housing vs Cheyenne $350K = $185K more expensive. WY property tax $2,100 vs ID $2,889 = ID pays $789 more. Analysis: Wyoming WINS financially for retirees (save $4,192 income tax + $185K cheaper housing), remote workers (0% tax, same salary). Idaho WINS for professionals seeking career growth (tech jobs pay +14-30% more in Boise), families prioritizing schools, outdoor enthusiasts. Trend: 19,870 net immigration to ID (2021-2022) vs WY net outmigration -890 suggests jobs > taxes for most movers.
Idaho switched to a flat tax (from tax year 2023) to simplify tax filing and compete with neighboring 0% tax states for California migration. Old structure (2022 and before): progressive brackets, four of them (1%, 3%, 4.5%, 6%) in 2022. New structure (2023+): single flat rate — 5.8% for 2023, 5.695% for 2024, 5.3% from 2025. For 2026, the rate is 5.3%. Drivers: (1) Compete with WY/NV/WA 0% tax to attract California refugees (75K Californians moved to ID 2010-2020), (2) Simplify tax administration, (3) Business lobby pressure. The rate was cut in 2024 and again in 2025 (House Bill 40); no further cut has been enacted for 2026.
No, Idaho's net immigration +19,870 (2021-2022, 2nd-highest % nationally) suggests the flat tax is NOT deterring movers — job growth and affordability matter more. At $100K: 5.3% above the zero-rate bracket = $4,192 annual tax. Comparison: WY $0 saves $4,192, BUT Boise jobs pay +14-30% more ($66K Boise median vs $58K Cheyenne), offsetting tax. Housing: Boise $535K vs Cheyenne $350K = $185K more expensive. Analysis: For high earners $150K+, ID 5.3% = $6,842 tax — WY savings are significant. But Boise tech jobs (Micron, HP, startups) don't exist in WY. For retirees $80-120K, WY wins (0% tax + cheaper housing). For professionals $75-150K, Boise wins (job growth + ultra-low 0.54% property tax + outdoor lifestyle). Trend: California exodus prioritizes Boise (31,240 CA to ID) over WY (4,120 CA to WY) 7.6x, suggesting jobs > taxes.
Micron's $15B Boise investment (announced 2022, expanding through 2030) is transformational for Idaho's economy and tax revenue. Direct impact: 17,000 new jobs (5,000 Micron employees $110K avg, 12,000 construction/suppliers $70K avg), $2.5B annual payroll = $132.5M new state income tax revenue (5.3% × $2.5B). Indirect impact: Housing demand (17K workers need homes, driving Boise median $535K up 15% since announcement), commercial development (restaurants, retail near Micron campus), semiconductor supply chain (50+ supplier companies relocating to ID). Idaho's corporate income tax rate is also 5.3% for tax years from 2025. Legislature debates using windfall: education (ID ranks 43rd in K-12 spending), infrastructure (I-84 expansion), OR further tax cuts (business groups push toward 5%). Governor Little prioritizes education. Micron investment justifies maintaining the 5.3% flat rate rather than cutting further to 5% — need revenue to support 17K new residents (schools, roads, water).
Idaho's 0.54% average property tax (7th-lowest in US, vs 1.1% national average) results from: (1) Statutory limits - Idaho Code 63-802 caps growth in a taxing district's property tax budget at 3% plus new construction (8% overall in most cases), preventing rapid increases despite Boise boom, (2) Income/sales tax carry burden - 5.3% flat income tax generates ~$2.0B + 6% sales tax generates $2.1B = ~$4.1B total, reducing reliance on property tax ($1.1B = ~20% of state revenue vs 35% nationally), (3) Agricultural exemptions - Idaho's $9.2B ag sector (potatoes, dairy, wheat) gets property tax breaks (farmland assessed at 'productive value' not market value, lowering overall average). At $535K Boise home: $2,889/year property tax. This modestly benefits California transplants: a $535K California home would pay $3,745 property tax (0.70% CA rate). ID saves $856/year on a comparably-priced home = $21,400 over 25-year mortgage — the bigger California-to-Idaho savings comes from Idaho's much lower home prices, not from the property tax rate difference alone. Ultra-low property tax is Idaho's secret weapon for attracting homeowners despite 5.3% income tax.
Yes, IF you're willing to accept 20-30% pay cut for quality-of-life + lower cost. At $150K Bay Area tech job vs $110K Boise Micron job: Bay Area: $150K - $9,561 CA tax (6.37%) - $10,500 property (0.70% × $1.5M) = approx $129,939 net. Boise: $110K - $4,722 ID tax (4.29% effective) - $2,889 property (0.54% × $535K) = ~$102,389 net. Bay Area wins $27,550/year BUT: Boise home $535K vs Bay Area $1.5M = save $965K upfront (30-year mortgage: $5,820/month Bay Area vs $3,220 Boise = save $2,600/month = $31,200/year). Add: shorter commute (Boise 20min vs Bay Area 90min), outdoor lifestyle (skiing 1hr, not 4hrs), cleaner air (Boise AQI 50 avg vs Bay Area AQI 80+), safer (Boise 8th-safest vs Oakland top 10 most dangerous). Analysis: Boise WINS for families prioritizing: housing equity ($965K savings > $30K annual income gap), quality-of-life (shorter commute, outdoor access, clean air, safe schools), remote work flexibility (keep Bay Area $150K salary, move to Boise = save $9,561 CA tax vs $6,842 ID = $2,719/year + $965K housing = massive win). Boise LOSES for: career climbers (Bay Area networking/job hopping drives 30-50% salary growth over 5 years vs Boise stagnant), urban lifestyle lovers (SF restaurants/culture/diversity > Boise suburban homogeneity), political liberals (ID 80% Republican legislature, abortion restrictions, school book bans = culture shock). Estimated 31,240 Californians moved to ID (2021-2022) suggest many choose lifestyle > salary.
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How we calculate: Idaho uses a flat tax system with a single 5.3% rate applied to Idaho taxable income (federal AGI minus $16,100 standard deduction for single filers in 2026) above a small zero-rate bracket ($4,811 for single filers in the 2025 schedule; the 2026 amount is not yet published). Our calculator applies the 5.3% rate to taxable income above that bracket and adds federal income tax using official 2026 IRS brackets. Effective tax rates are calculated by dividing total tax by gross income. For comparison purposes, we show neighboring states' tax calculations at the same income levels using their official 2026 tax brackets and rates.
Data sources: Idaho State Tax Commission: tax.idaho.gov - Official 2026 tax rate (5.3% flat), standard deduction ($16,100 single), rate history (four brackets in 2022, flat rate from 2023), Food Tax Credit ($155 per person for 2025), property/sales tax rates. IRS: Federal tax brackets 2026. U.S. Census Bureau: Migration data (2021-2022), population growth (2010-2020 +17.3%, 2nd-fastest US), median household income ($66,000 ID). Zillow: Median homes (Boise $535K, Twin Falls $380K, Idaho Falls $420K, January 2026). Micron Technology: 2022 press release ($15B investment, 17K jobs, $2.5B payroll). Idaho Department of Commerce: California migration estimates (75K CA to ID 2010-2020).
Verification: Idaho's 5.3% flat rate verified against Idaho Code §63-3024 and ID Tax Commission 2026 guidance. The rate history (four brackets in 2022; flat 5.8% for 2023, 5.695% for 2024 and 5.3% from 2025; still 5.3% for 2026) was checked against the Idaho State Tax Commission's individual income tax rate schedule. Federal brackets verified against IRS Revenue Procedure 2025-32. Migration data from IRS SOI via Census Bureau. Property/sales tax from ID Tax Commission 2025 report. Housing data from Zillow (January 2026). Micron data from Micron 2022 announcement + ID Dept of Commerce economic impact report (2023).
Limitations: Assumes single filer, W-2 income only, standard deduction ($16,100 single), ID full-year residency. Does not include: county/city sales tax variations (6% state flat, no local add-on in most areas), property tax variations by county (0.54% average, Boise 0.53%, rural 0.45-0.65%), federal credits (EITC, child tax credit), part-year/nonresident calculations (ID aggressively audits CA residents claiming ID residency), retirement income exemptions (Social Security EXEMPT at all income levels, pensions/401k/IRA FULLY TAXED at 5.3% flat rate), Food Tax Credit ($155 per person for 2025, or actual food sales tax paid up to $250 each). Consult licensed ID CPA for: multi-state income (CA/WA commuters), retirement income optimization (SS exempt, pension 5.3%), business income (C-corps 5.3% from 2025, pass-throughs 5.3% individual rate), real estate transactions (no transfer tax), estate planning (no ID estate tax but federal estate tax applies for estates >$15M).
Last Updated: May 2026
Verified By: Daniel · CountryTaxCalc
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Last Updated: May 2026