Idaho charges 5.3% flat state income tax. Use the stock option tax calculator pre-loaded with Idaho rates.
Open Stock Option Tax Calculator →Stock option exercises in Idaho are subject to a flat 5.3% state income tax on top of federal tax. For NSOs, the spread at exercise is ordinary income subject to both federal and Idaho state tax plus FICA. For ISOs, while there is no regular tax at exercise, the spread counts for AMT purposes and for Idaho state tax calculations. This calculator helps you plan the optimal time and amount to exercise given Idaho's tax rates.
Idaho levies a flat 5.3% state income tax on all taxable income regardless of how much you earn. This makes tax planning straightforward: for every additional dollar you earn, 5.3 cents goes to Idaho. Idaho does not impose local income taxes, so the 5.3% flat rate is the only state-level income tax you owe.
The table below shows what you actually keep at five salary levels in Idaho, accounting for federal tax, FICA, and Idaho's flat 5.3% state tax.
See how Idaho compares to other West states. Each link takes you to the stock option tax calculator landing page for that state.
For a comprehensive breakdown of Idaho’s tax structure, salary comparisons, cost-of-living analysis, and more, visit the full Idaho take-home pay page.