You live in Colorado — Denver, Boulder, remote for a CO employer — and want the effective RSU tax rate including Colorado state income tax on vest wages plus federal and FICA.
Start here
What you need before using this
- CO residency for year.
- confirmation and CO on pay stub.
- CO wage boxes.
- Colorado DOR rate for filing year.
- tax calculator with Colorado selected.
Colorado tax rates follow Colorado DOR guidance for the filing year. Local taxes may apply separately.
Why this happens
Colorado treats equity compensation at as taxable wages.
Flat CO state rate simplifies state layer vs progressive states like CA or NY.
Federal progressive tax still applies separately on .
FICA applies nationwide on wages.
CO supplemental on equity may use flat methods that under- federal portion.
Moving from CO to no-tax state mid-year triggers part-year CO return.
Moving from CA or NY to CO removes progressive state layer on post-move vests.
Remote CO resident for out-of-state employer still typically CO taxes wages.
Estimated federal tax may be needed even when CO flat is accurate at state level.
Denver and other local taxes — verify current local rules; state rate page focuses on state income tax.
tax rate Colorado searches often compare to California — CO flat rate vs CA progressive.
Stock options and same CO wage treatment when CO-sourced.
Boxes 16–17 include in CO wages when CO payroll applies.
TABOR and legislative changes — confirm rate for filing year.
Outdoor industry and tech vests follow same payroll wage rules.
What to check
- CO state on pay stub.
- CO wage and tax boxes.
- Federal Box 1 and .
- CO flat rate times estimated taxable income for rough state tax.
- Federal gap vs .
- Move date if part-year CO.
- Calculator output vs pay stub.
- Colorado DOR pub for current year.
Assuming Colorado flat tax means RSU tax is fully covered by vest withholding
What to check in your documents
- 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 — verify current CO 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.
- Remote worker in Colorado RSU tax?
- CO resident generally owes CO tax on wages.
- Which calculator for CO RSU?
- tax calculator with Colorado selected and gap for federal layer.
- W-2 CO boxes for RSU?
- State wage and tax boxes reflect when CO payroll applies.
- FICA on Colorado RSU vest?
- Federal FICA on until wage base cap.
- Related guides?
- Colorado tax guide, California to Colorado comparisons, effective tax rate, moving states.
When to get help from a tax pro
- 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.
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.
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.
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.