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Tax year 2026

Idaho vs Utah Income Tax — 2026

A single filer earning $100,000 pays $3 less per year in Idaho than in Utah — $0 a month. Idaho charges $4,447; Utah charges $4,450.

Why this pair has a page: bordering states.

Idaho at $100K
$4,447
4.45%
Utah at $100K
$4,450
4.45%
Annual difference
$3
$0 a month
National ranks
37 vs 38
of 51, lowest tax first

The bill at every income

Single filer, standard deduction, no dependents. State income tax only.

Idaho and Utah income tax compared at seven income levels, 2026
Gross incomeIdaho taxUtah taxDifference
$50,000$1,797$1,666$131 less in UT
$75,000$3,122$3,103$18 less in UT
$100,000$4,447$4,450$3 less in ID
$150,000$7,097$6,675$422 less in UT
$250,000$12,397$11,125$1,272 less in UT
$500,000$25,647$22,250$3,397 less in UT
$1,000,000$52,147$44,500$7,647 less in UT
Annual state income tax, Idaho versus Utah
ID at $50,000: $1,797ID at $50,000$1,797UT at $50,000: $1,666UT at $50,000$1,666ID at $75,000: $3,122ID at $75,000$3,122UT at $75,000: $3,103UT at $75,000$3,103ID at $100,000: $4,447ID at $100,000$4,447UT at $100,000: $4,450UT at $100,000$4,450ID at $150,000: $7,097ID at $150,000$7,097UT at $150,000: $6,675UT at $150,000$6,675ID at $250,000: $12,397ID at $250,000$12,397UT at $250,000: $11,125UT at $250,000$11,125ID at $500,000: $25,647ID at $500,000$25,647UT at $500,000: $22,250UT at $500,000$22,250ID at $1,000,000: $52,147ID at $1,000,000$52,147UT at $1,000,000: $44,500UT at $1,000,000$44,500

How the two systems differ

Idaho and Utah income tax systems compared
IdahoUtah
Tax structureFlat rateFlat rate
Top marginal rate5.3%4.45%
Number of brackets11
Standard deduction (single)$16,100None
Personal exemptionNone$966 credit
Local income taxesNoNo
Capital gainspreferentialordinary
Population (2024)2,001,6193,503,613

By filing status

Idaho and Utah tax on $100,000 by filing status, 2026
Filing statusIdahoUtahDifference
Single$4,447$4,450$3 less in ID
Married filing jointly$3,593$3,332$262 less in UT
Married filing separately$4,447$4,450$3 less in ID
Head of household$4,020$3,936$84 less in UT

Change the assumptions

Adjust income and filing status, or swap either state. The URL updates so you can share the exact comparison.

At $100,000 as a single filer, Idaho costs $3 less per year than Utah — $0 a month.

Idaho compared with Utah at $100,000
IdahoUtahDifference
State income tax$4,447$4,450$3
Per month$371$371$0
Effective rate4.45%4.45%0.00 pts
Marginal rate5.3%4.45%0.85 pts
Standard deduction$16,100$0$16,100
Taxable income$83,900$100,000$16,100
Tax structureFlat rateFlat rate
Local income taxesNoNo

Full detail: Idaho · Utah · methodology

What this comparison leaves out

Sources for both states

  1. 1.Idaho State Tax CommissionState revenue department
    Table for Percentage Computation Method of Withholding (EPB00744, 07-23-2026)
    https://tax.idaho.gov/document-mngr/pubs_EPB00744/
    Retrieved · Annual payroll period: single/head of household, "5.3% of the amount over $16,100"; married, "5.3% of the amount over $32,200" - i.e. the 5.3% rate applied above the 2026 federal standard deduction.
  2. 2.Utah State LegislatureState statute
    S.B. 60, Income Tax Rate Amendments (2026 General Session, enrolled)
    https://le.utah.gov/Session/2026/bills/enrolled/SB0060.pdf
    Retrieved · Amends Utah Code 59-10-104: tax equals state taxable income multiplied by "4.45%" (replacing "4.5%"). Effective May 6, 2026, with retrospective operation for taxable years beginning on or after January 1, 2026.

Figures on this page were last checked against these sources on . Found something wrong? Report it.