All states

Colorado

Flat rate
Filing status
Income
Pre-tax adjustments
Itemized deductions
Household

Estimated taxes

Tax year 2025
Gross income$0
Total tax$0
Take-home pay$0

Overall effective rate: 0.0%

Federal

Adjusted gross income
$0
Standard deduction
$15,000
Taxable income
$0
Tax before credits
$0
Credits
- $0
Federal income tax
$0
Effective / marginal rate
0.0% / 0.0%

FICA

Social Security
$0
Medicare
$0
FICA total
$0

State — Colorado (CO)

State taxable income
$0
State income tax
$0
State + local tax
$0
Effective / marginal rate
0.0% / 0.0%

Notes

  • Colorado levies a single flat rate of 4.40% (2025) on Colorado taxable income — no brackets, same rate for every filing status and income level.
  • The tax base is FEDERAL TAXABLE INCOME (Form 1040 line 15), not AGI; Colorado has no standard deduction or brackets of its own.
  • State income tax addback: taxpayers who itemized federally must add back the state income tax they deducted on Schedule A (reduced by any SALT disallowed by the federal $10,000 cap).
  • Federal deductions addback (HB21-1311): for 2025, taxpayers with federal AGI of $300,000+ cap their federal deduction at $12,000 (single/MFS/HoH) or $16,000 (MFJ) and add back the excess, net of the state income tax addback.
  • DR 0104 subtractions (qualifying pension/Social Security, U.S. government interest, state tax refunds, 529 contributions, etc.) are NOT modelled because the shared input has no fields for them.

Sources

Disclaimer: This is an informational estimate for the 2025 tax year only and is provided on a best-effort basis. It is not tax, legal, investment, or financial advice. Results are approximate, may be inaccurate or out of date, and may not reflect all credits, deductions, phase-outs, or local rules. This site assumes no liability for any decisions made or outcomes resulting from its use. Consult a qualified tax professional before filing or making any decisions.