Idaho has a flat income tax (5.3% flat). On $100K, you keep $73,825 (26.2% effective rate), ranking #43/50 states. Cost-adjusted: #30.
Pre-filled with Idaho tax rates. Adjust salary and filing status.
Idaho uses a flat income tax rate of 5.3%, meaning all income is taxed at the same rate regardless of how much you earn. This simplicity is valued by taxpayers and businesses alike.
Idaho’s sales tax adds to the overall tax burden for residents. When evaluating total taxes, consider income, sales, and property taxes together.
Property tax rates in Idaho vary by county and municipality. The overall property tax burden should be considered alongside income taxes when evaluating total cost.
Idaho has a cost of living roughly in line with the national average (index 95), meaning your take-home pay translates fairly directly to purchasing power.
How does Idaho’s tax burden change as your income rises? With a flat tax, the state rate is constant, but the overall effective rate still rises because federal brackets are progressive.
| Gross Salary | Federal Tax | FICA | State Tax | Take-Home | Effective Rate | Monthly |
|---|---|---|---|---|---|---|
| $40K | $2,620 | $3,060 | $2,120 | $32,200 | 19.5% | $2,683 |
| $50K | $3,820 | $3,825 | $2,650 | $39,705 | 20.6% | $3,309 |
| $60K | $5,020 | $4,590 | $3,180 | $47,210 | 21.3% | $3,934 |
| $75K | $7,725 | $5,738 | $3,975 | $57,563 | 23.3% | $4,797 |
| $100K | $13,225 | $7,650 | $5,300 | $73,825 | 26.2% | $6,152 |
| $120K | $17,625 | $9,180 | $6,360 | $86,835 | 27.6% | $7,236 |
| $150K | $24,774 | $11,475 | $7,950 | $105,801 | 29.5% | $8,817 |
| $200K | $36,774 | $14,339 | $10,600 | $138,287 | 30.9% | $11,524 |
The median household income in Idaho is $55,000, which translates to $43,458/year ($3,621/month) take-home after all taxes. This is near the national median.
After cost-of-living adjustment, the median income’s purchasing power in Idaho is equivalent to $45,745 in an average-cost area. Your money stretches further here than the raw numbers suggest.
Idaho ranks #43/50 for raw take-home pay and #30/50 for cost-adjusted purchasing power at $100K. The 13-position shift between raw and cost-adjusted ranking reflects the below-average cost of living, which boosts real purchasing power.
At $100K in Idaho, you keep $73,825. The best state (Alaska) gives $79,125, and the worst (California) gives $70,480. Idaho is in the bottom 10 — consider whether the $5,300/year difference justifies exploring other states.
Idaho has a flat income tax structure with rates of 5.3% flat. On $100K, you’ll pay approximately $5,300 in state income tax, bringing your total take-home to $73,825 after all federal and state taxes.
Filing as married filing jointly on $100K changes take-home from $73,825 (single) to $79,410 (married). The $5,585 marriage bonus comes from the doubled standard deduction ($32,200 vs $16,100) and wider lower brackets.
Idaho does not impose local income taxes, so the state rate is your only state-level income tax.
How does Idaho stack up against other states in the West?