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Tax year 2026

Colorado vs Oklahoma Income Tax — 2026

A single filer earning $100,000 pays $263 less per year in Colorado than in Oklahoma — $22 a month. Colorado charges $3,692; Oklahoma charges $3,955.

Why this pair has a page: bordering states.

Colorado at $100K
$3,692
3.69%
Oklahoma at $100K
$3,955
3.95%
Annual difference
$263
$22 a month
National ranks
25 vs 28
of 50, lowest tax first

The bill at every income

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

Colorado and Oklahoma income tax compared at seven income levels, 2026
Gross incomeColorado taxOklahoma taxDifference
$50,000$1,492$1,705$213 less in CO
$75,000$2,592$2,830$238 less in CO
$100,000$3,692$3,955$263 less in CO
$150,000$5,892$6,205$313 less in CO
$250,000$10,292$10,705$413 less in CO
$500,000$21,292$21,955$663 less in CO
$1,000,000$43,292$44,455$1,163 less in CO
Annual state income tax, Colorado versus Oklahoma
CO at $50,000: $1,492CO at $50,000$1,492OK at $50,000: $1,705OK at $50,000$1,705CO at $75,000: $2,592CO at $75,000$2,592OK at $75,000: $2,830OK at $75,000$2,830CO at $100,000: $3,692CO at $100,000$3,692OK at $100,000: $3,955OK at $100,000$3,955CO at $150,000: $5,892CO at $150,000$5,892OK at $150,000: $6,205OK at $150,000$6,205CO at $250,000: $10,292CO at $250,000$10,292OK at $250,000: $10,705OK at $250,000$10,705CO at $500,000: $21,292CO at $500,000$21,292OK at $500,000: $21,955OK at $500,000$21,955CO at $1,000,000: $43,292CO at $1,000,000$43,292OK at $1,000,000: $44,455OK at $1,000,000$44,455

How the two systems differ

Colorado and Oklahoma income tax systems compared
ColoradoOklahoma
Tax structureFlat rateGraduated
Top marginal rate4.4%4.5%
Number of brackets14
Standard deduction (single)$16,100$6,350
Personal exemptionNone$1,000
Local income taxesNoNo
Capital gainsordinaryordinary
Population (2024)5,957,4934,095,393

By filing status

Colorado and Oklahoma tax on $100,000 by filing status, 2026
Filing statusColoradoOklahomaDifference
Single$3,692$3,955$263 less in CO
Married filing jointly$2,983$3,409$426 less in CO
Married filing separately$3,692$3,955$263 less in CO
Head of household$3,337$3,605$267 less in CO

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, Colorado costs $263 less per year than Oklahoma — $22 a month.

Colorado compared with Oklahoma at $100,000
ColoradoOklahomaDifference
State income tax$3,692$3,955$263
Per month$308$330$22
Effective rate3.69%3.95%0.26 pts
Marginal rate4.4%4.5%0.10 pts
Standard deduction$16,100$6,350$9,750
Taxable income$83,900$92,650$8,750
Tax structureFlat rateGraduated
Local income taxesNoNo

Full detail: Colorado · Oklahoma · methodology

What this comparison leaves out

Sources for both states

  1. 1.Colorado Department of RevenueState revenue department
    2026 Colorado Withholding Worksheet for Employers (DR 1098, rev. 10/21/25)
    https://tax.colorado.gov/sites/tax/files/documents/DR_1098_Colorado_Withholding_Worksheet_for_Employees.pdf
    Retrieved · Worksheet 1 line 2c: "Multiply line 2b by 4.40% (0.044)" for tax year 2026.
  2. 2.Oklahoma Tax CommissionState revenue department
    2026 Oklahoma Income Tax Withholding Tables (Packet OW-2, revised 11-2025)
    https://www.oklahoma.gov/content/dam/ok/en/tax/documents/resources/publications/businesses/withholding-tables/WHTables-2026.pdf
    Retrieved
  3. 3.Tax FoundationResearch organisation (cross-check)
    State Individual Income Tax Rates and Brackets, 2026
    https://taxfoundation.org/data/all/state/state-income-tax-rates-2026/
    Retrieved

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