Colorado Tax Guide

⚠️ Important Disclaimer

This guide is for general informational purposes only and provides simplified overviews and estimates. It does not provide tax, legal, payroll, accounting, or financial advice.

Tax rules can change, and actual paycheck amounts may vary based on your employer, benefit elections, filing status, local taxes, deductions, credits, garnishments, and withholding elections. This guide does not cover every possible tax scenario.

For personalized tax advice, please consult a qualified tax professional.

For official guidance, review materials from the Colorado Department of Revenue and the Internal Revenue Service (IRS).

Last reviewed: June 2026

Colorado at a Glance

Colorado levies a flat income tax rate of 4.4% on all taxable income. The state uses the federal standard deduction ($16,100 single / $32,200 MFJ) which simplifies the calculation.

Colorado does not fully tax Social Security benefits for most filers age 55 and older, offering a deduction that can reduce or eliminate state tax on those benefits.

Key Tax Facts for Colorado

State Income Tax

Flat 4.4%

Federal Brackets

10% – 37%

Social Security

6.2%

Medicare

1.45%

SS Wage Base

$184,500

Standard Deduction

$16,100 / $32,200

Colorado Income Tax Brackets (2026)

Colorado has a flat income tax rate of Flat 4.4%. All taxable income is taxed at the same rate regardless of how much you earn.

How Your Colorado Paycheck Is Calculated

Every paycheck goes through the same basic pipeline from gross pay to the net amount that hits your bank account:

Gross Pay — Your total earnings for the pay period. For hourly workers this is (hours × rate) plus any overtime or double-time premiums. For salaried employees it’s your annual salary divided by the number of pay periods.
Pre-Tax Deductions — Contributions to 401(k), 403(b), HSA, or FSA are subtracted before income taxes are calculated. These lower your taxable wages but Social Security and Medicare still apply to the full gross in most cases.
Federal Income Tax — Withheld using the IRS Publication 15-T percentage method based on your W-4 filing status, credits, and additional withholding elections. For 2026, rates range from 10% to 37%.
State Income Tax — Colorado withholds state income tax at rates of Flat 4.4% based on your annualized income and filing status. The standard deduction is $16,100 (single) / $32,200 (MFJ).
FICA Taxes — Social Security (6.2% on wages up to $184,500) and Medicare (1.45% on all wages). If your year-to-date earnings exceed the Social Security wage base, that portion stops being withheld.
Net Pay (Take-Home) — What’s left after all taxes and deductions. This is the amount deposited into your account each pay period.

Good to Know

Review your W-4 periodically. If you consistently receive a large refund, you may be over-withholding. Consider reviewing your W-4 Step 3 credits or Step 4(b) deductions to better align your withholding with your actual tax liability. The IRS Tax Withholding Estimator can help.
Benefits of contributing to a 401(k) or 403(b). Pre-tax retirement contributions can reduce your federal and state taxable income for the year. Even a modest percentage — say 3% to 6% — may noticeably lower your tax withholding while building long-term savings. Consult your plan administrator or a financial advisor for guidance.
Benefits of an HSA if you’re eligible. Health Savings Accounts offer a rare triple tax advantage — contributions lower your taxable income now, the balance grows tax-free, and withdrawals for qualified medical expenses are also tax-free. If you’re enrolled in a qualifying high-deductible health plan, an HSA is one of the most tax-efficient savings tools available.
Colorado tax note. Colorado has a flat income tax rate of 4.4% on all taxable income.
Colorado tax note. Colorado uses the federal standard deduction as its starting point for state taxes ($16,100 single / $32,200 MFJ for 2026).
Colorado tax note. Colorado does not fully tax Social Security benefits for most filers age 55 and older.

Frequently Asked Questions

What is Colorado’s income tax rate?

Colorado has a flat income tax rate of 4.4% on all taxable income, regardless of income level.

Does Colorado tax Social Security?

Colorado allows most filers age 55 and older to deduct Social Security benefits from their state taxable income. Younger filers may have their benefits partially taxed.

Does Colorado use the federal standard deduction?

Yes. Colorado uses the federal standard deduction as its starting point, which is $16,100 for single filers and $32,200 for married filing jointly for 2026.

Sources

The information in this guide is based on the following official and publicly available sources. Always verify current rates and rules before making financial decisions.