Idaho Paycheck Calculator

A flat 5.3%, applied identically to every dollar of taxable income regardless of how much someone earns, confirmed via Tax Foundation's 2026 state tax table. Idaho moved to this single-rate structure in recent tax reform, having previously used a graduated multi-bracket system.

Idaho conforms its standard deduction to the federal amount: $16,100 for single filers and $32,200 for married filing jointly, rather than maintaining a separate state-specific figure the way states like Kansas or Mississippi do, per Tax Foundation's 2026 state tax table.

No — the flat 5.3% rate itself is identical regardless of filing status; only the standard deduction differs (doubling to $32,200 for married filing jointly), which lowers married-filer taxable income relative to a single filer at the same gross salary.

There is nothing to include, because no such program exists in Idaho as of 2026 — no state-run disability insurance or paid-family-leave payroll premium comparable to Colorado's FAMLI or Rhode Island's TDI exists here. The only state-level withholding this calculator applies for Idaho is the flat income tax.

A flat rate means every dollar of taxable income is taxed at the same 5.3%, with no escalating brackets as income rises — simpler to estimate than a progressive-bracket state, though whether it's higher or lower than a comparable bracket state depends on the specific income level and that state's own rates and thresholds.

Idaho has adjusted its flat rate in past legislative sessions as part of broader tax policy decisions, so future changes are possible, but this calculator reflects the confirmed current 5.3% rate for tax year 2026 specifically and does not attempt to predict future legislative action.

It depends on income, filing status, and pay frequency, but for a single filer earning $75,000 a year paid biweekly, this calculator withholds $16,529.20 total across federal tax, Idaho's flat 5.3% state tax, Social Security, and Medicare — about 22% of gross pay, leaving $2,248.88 per paycheck. Idaho's own share stays a constant 5.3% of taxable income at any salary, while the federal portion rises as income climbs through higher brackets, so the combined percentage taken out grows with income even though Idaho's own rate never does.

A single filer earning $70,000 a year in Idaho, paid biweekly, nets $55,218.30 annually or $2,123.78 per paycheck after $6,570 in federal tax, $2,856.70 in Idaho state tax at 5.3%, $4,340 in Social Security, and $1,015 in Medicare. A married joint filer at the same $70,000 household income nets more — $58,601.60 a year — because the doubled standard deduction lowers both federal and Idaho taxable income.

A single filer earning $100,000 a year in Idaho, paid biweekly, nets $74,733.30 annually or $2,874.36 per paycheck after $13,170 in federal tax, $4,446.70 in Idaho state tax at 5.3%, $6,200 in Social Security, and $1,450 in Medicare — a 25.27% effective tax rate. That rate is higher than at $75,000 because more income lands in higher federal brackets, even though Idaho's own 5.3% state rate stays identical at every income level.

This calculator works backward from your annual salary: it computes yearly federal tax, Idaho's flat 5.3% state tax, Social Security, and Medicare first, then divides the resulting net annual figure by your chosen pay frequency — 52 for weekly, 26 for biweekly, 24 for semimonthly, or 12 for monthly — to produce your per-paycheck amount. Because Idaho's rate is flat rather than bracketed, that per-paycheck state-tax portion scales in a straight line with income, unlike a progressive-bracket state where the ratio can shift slightly by pay period.