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Tax year 2026

Colorado vs New Mexico Income Tax — 2026

A single filer earning $100,000 pays $123 less per year in New Mexico than in Colorado — $10 a month. Colorado charges $3,692; New Mexico charges $3,569.

Why this pair has a page: bordering states.

Colorado at $100K
$3,692
3.69%
New Mexico at $100K
$3,569
3.57%
Annual difference
$123
$10 a month
National ranks
25 vs 22
of 50, lowest tax first

The bill at every income

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

Colorado and New Mexico income tax compared at seven income levels, 2026
Gross incomeColorado taxNew Mexico taxDifference
$50,000$1,492$1,184$307 less in NM
$75,000$2,592$2,359$232 less in NM
$100,000$3,692$3,569$123 less in NM
$150,000$5,892$6,019$128 less in CO
$250,000$10,292$11,158$867 less in CO
$500,000$21,292$25,908$4,617 less in CO
$1,000,000$43,292$55,408$12,117 less in CO
Annual state income tax, Colorado versus New Mexico
CO at $50,000: $1,492CO at $50,000$1,492NM at $50,000: $1,184NM at $50,000$1,184CO at $75,000: $2,592CO at $75,000$2,592NM at $75,000: $2,359NM at $75,000$2,359CO at $100,000: $3,692CO at $100,000$3,692NM at $100,000: $3,569NM at $100,000$3,569CO at $150,000: $5,892CO at $150,000$5,892NM at $150,000: $6,019NM at $150,000$6,019CO at $250,000: $10,292CO at $250,000$10,292NM at $250,000: $11,158NM at $250,000$11,158CO at $500,000: $21,292CO at $500,000$21,292NM at $500,000: $25,908NM at $500,000$25,908CO at $1,000,000: $43,292CO at $1,000,000$43,292NM at $1,000,000: $55,408NM at $1,000,000$55,408

How the two systems differ

Colorado and New Mexico income tax systems compared
ColoradoNew Mexico
Tax structureFlat rateGraduated
Top marginal rate4.4%5.9%
Number of brackets16
Standard deduction (single)$16,100$16,100
Personal exemptionNoneNone
Local income taxesNoNo
Capital gainsordinarypreferential
Population (2024)5,957,4932,130,256

By filing status

Colorado and New Mexico tax on $100,000 by filing status, 2026
Filing statusColoradoNew MexicoDifference
Single$3,692$3,569$123 less in NM
Married filing jointly$2,983$2,576$408 less in NM
Married filing separately$3,692$3,706$14 less in CO
Head of household$3,337$2,954$383 less in NM

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, New Mexico costs $123 less per year than Colorado — $10 a month.

Colorado compared with New Mexico at $100,000
ColoradoNew MexicoDifference
State income tax$3,692$3,569$123
Per month$308$297$10
Effective rate3.69%3.57%0.12 pts
Marginal rate4.4%4.9%0.50 pts
Standard deduction$16,100$16,100$0
Taxable income$83,900$83,900$0
Tax structureFlat rateGraduated
Local income taxesNoNo

Full detail: Colorado · New Mexico · 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.New Mexico Taxation and Revenue DepartmentState revenue department
    FYI-104, New Mexico Withholding Tax, Effective January 1, 2026 (Rev. 11/2025)
    https://realfile.tax.newmexico.gov/FYI-104.pdf
    Retrieved · 2026 percentage-method tables reproduce the same 1.5%/3.2%/4.3%/4.7%/4.9%/5.9% progression and the same bracket widths ($8,000, $25,000, $50,000, $100,000, $315,000 above the deduction offset for married filers), confirming the statutory schedule is unchanged for 2026.
  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 · Reproduces the same six brackets for both filing schedules.

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