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Idaho vs Wyoming: state income tax, 2025

For reference household P1 (single, $60,000 of wages), the state income tax is at most $2,100 more in Idaho than in Wyoming.

Both figures are a hypothetical full-year resident return for tax year 2025, over the same federal return, and count state income tax only. Neither is a relocation estimate: moving mid-year means two part-year returns, which this site does not figure. “Or less” means a mechanism the engine does not yet model would lower the figure; “or more” that it would raise it.

Six households, both states

HouseholdIdahoWyomingIdaho minus Wyoming
P1 Single, $60,000 of wages$2,100or less$0+$2,100or less
P2 Married filing jointly, $150,000, two children$5,371or less$0+$5,371or less
P3 Single, $85,000 wages + $15,000 long-term gain + $3,000 qualified dividends$4,379or less$0+$4,379or less
P4 Married retirees, $40,000 Social Security + $30,000 pension + $20,000 IRA, both 65+$10or less$0+$10or less
P5 Head of household, $45,000, one child$428or less$0+$428or less
P6 Single, $1,200,000 of wages + $500,000 long-term gain$89,020or less$0+$89,020or less

Full-year resident figures for 2025, state income tax only, with the same federal return in every column. Every figure is provisional. “Not shown” and “not figured” mean the engine will not state a number it cannot stand behind; hover for why.

Where the difference comes from

Idaho

Wyoming

What this comparison leaves out

Mechanisms the engine does not model yet. Each one is named with the direction it would move the figure, which is where every “or less” above comes from.

Idaho

  • Retirement benefits deduction (Form 39R Part B line 8) Idaho Code §63-3022A — the figure is too high without it
  • The other Form 39R Part B subtractions — U.S. government obligation interest, energy efficiency upgrades, alternative energy devices, technological equipment donations, the Idaho capital gains deduction, health insurance premiums, and the Idaho college and medical savings accounts Idaho Code §63-3022 — the figure is too high without it
  • Idaho-issued municipal interest inside the Form 39R Part A line 3 addition Idaho Code §63-3022M — the figure is too high without it
  • Permanent Building Fund tax exemptions the return does not record Idaho Code §63-3082 — the figure is too high without it
  • Credit for income tax paid to other states (Form 39R Part D) Idaho Code §63-3029 — the figure is too high without it

Wyoming

Nothing declared.

Taxes that are not income tax. Property tax, sales and excise taxes, and state payroll levies such as disability or paid-leave contributions are not counted here, and none of them is small. Federal tax is excluded because it is the same in both columns. A state income tax comparison is not a total tax burden comparison; see methodology.

Data status

Idaho. 2025 rules are provisional; engine coverage is implemented, with 5 mechanisms declared as not yet modelled. See the 2025 rate table.

Wyoming. 2025 rules are provisional; engine coverage is implemented, with nothing declared as unmodelled. See the 2025 rate table.

2026 state rules are not built yet, so this page compares 2025 only. Track status on the 2025 data status board.

Try it with your own return

The six households above are reference cases. Your own return will land differently. Compare Idaho and Wyoming over your own return — it stays in your browser.