You searched for a Colorado RSU tax rate and found conflicting numbers — you want the real combined hit on vest FMV including Colorado state tax, federal, and FICA, especially if you moved from California to the Denver tech corridor.
In plain terms
Gather before you start
- CO residency for year.
- confirmation and CO on pay stub.
- CO wage boxes.
- Colorado DOR rate for filing year.
- tax calculator with Colorado selected.
How the tax works
Searches for an tax rate in Colorado usually mean you want one percentage to plan cash for a . Colorado applies a flat state income tax rate to taxable income including wages per Colorado DOR guidance for your filing year — simpler than progressive states like California or New York, but still stacked on top of federal tax and FICA.
Federal progressive income tax and FICA apply separately on . FICA runs nationwide on wages with Social Security stopping at the annual wage base and Medicare applying to the full amount. Employer supplemental on equity often uses flat federal methods that can under- compared with your true stacked on salary plus .
Denver and the Front Range tech corridor — Boulder, Broomfield, and the metro suburbs — are where most Colorado planning questions come up. Employees moving from San Francisco or New York to Denver often compare Colorado's flat state layer to the progressive rates they left behind. Post-move vests as a Colorado resident follow Colorado rules; pre-move vests may remain connected to the prior state.
Moving from Colorado to a no-tax state mid-year triggers a part-year Colorado return on pre-move connected income. Remote CO residents working for out-of-state employers still typically owe Colorado tax on wages as resident income. Estimated federal tax may be needed even when Colorado flat state is accurate at the state layer.
The practical planning number is a combined estimate: Colorado flat state rate per current DOR publications times estimated taxable income, plus federal plus remaining FICA on the . Use the Colorado tax guide for mechanism detail and the tax calculator with Colorado selected for a stacked-income estimate.
What to check on your end
- CO state on pay stub.
- CO wage and tax boxes.
- Federal Box 1 and .
- CO flat rate per DOR pub for filing year.
- Federal gap vs .
- Move date if part-year CO.
- Calculator output vs pay stub.
1 more checklist item
- Colorado DOR pub for current year.
Assuming Colorado flat tax means RSU tax is fully covered by vest withholding
What to pull from your files
- CO pay stub.
- CO boxes.
- confirmation.
- CO estimated tax if made.
- Move docs if part-year.
Denver employee vesting after California move
Illustration only, not your tax situation.
Questions people ask
- What is the RSU tax rate in Colorado?
- CO flat state rate on wages plus federal marginal tax plus FICA — check Colorado DOR publications for the current flat rate for your filing year.
- Are RSUs taxed in Colorado?
- Yes — is CO wage income for typical CO residents.
- Colorado vs California RSU tax?
- California uses progressive rates. Colorado flat state rate on taxable income — federal and FICA both states.
- CO RSU supplemental withholding?
- Employers CO and federal on — federal supplemental may still under- vs .
- Moved from Colorado to Texas?
- CO may tax pre-move connected income. Post-move TX vests avoid TX state income tax.
When a CPA is worth it
- Part-year CO resident with equity from two states.
- Local tax questions for specific Colorado municipalities.
- Employer withheld wrong state on CO resident .
- Multi-state remote work allocation.
Sources and notes
Primary tax claims on this page are supported by the official and secondary sources below. Broker and software links describe reporting mechanics — confirm rules against IRS or state guidance.
Colorado flat individual income tax on vest wages; confirm current CO DOR rate.
- Colorado DOR — Individual Income Tax
Colorado Department of Revenue · Official
Colorado individual income tax including flat rate structure.
- IRS Publication 525 — Taxable and Nontaxable Income
Internal Revenue Service · Official
Covers compensation income from stock-based pay, including restricted property under section 83.
Related calculators
- RSU Tax Calculator
Model federal and state taxes on your RSU vest, compare withholding to estimated tax, and see what you may keep.
- RSU Withholding Gap Calculator
Focus on the gap between what your employer withholds on RSU vests and what you may owe when everything is reconciled.
- RSU State Tax Comparison Calculator
Run the same RSU vest through different state assumptions to see how location may change estimated tax.
Related pages
- Colorado RSU Tax Guide
Colorado taxes RSU vest income as wages; understand state withholding alongside federal supplemental rates.
- RSU Tax Rate in California
California adds progressive state tax on RSU vest FMV — effective rate is CA plus federal plus FICA, not one flat RSU percentage.
- California to Texas RSU Tax Guide
Texas has no state income tax on wages, but your move date relative to vest dates still matters for CA.
- RSU Effective Tax Rate Explained
There is no flat RSU tax rate — effective tax on vest FMV includes federal, FICA, and state components that change with your total income.
- RSU Taxes When Moving States
Moving mid-year can mean more than one state has a claim on part of your compensation — planning beats guessing.
For learning, not filing
VestingTax.com is not a CPA firm or tax preparer. Grants, employers, and states all differ. Use the cited IRS and state sources above, your own documents, and a qualified tax professional before you make decisions from this guide.