You live in Illinois — Chicago, Naperville, remote for an IL employer — and want the effective RSU tax rate including Illinois state income tax on vest wages plus federal and FICA.
Start here
What you need before using this
- IL residency for year.
- confirmation and IL on pay stub.
- IL wage boxes.
- Illinois DOR rate for filing year.
- tax calculator with Illinois selected.
Illinois tax rates follow Illinois Department of Revenue guidance for the filing year.
Why this happens
Illinois treats equity compensation at as taxable wages.
Flat IL state rate simplifies state layer vs progressive states like CA or NY.
Federal progressive tax still applies separately on .
FICA applies nationwide on wages.
IL supplemental on equity may use flat methods that under- federal portion.
Moving from IL to no-tax state mid-year triggers part-year IL return.
Moving from CA or NY to IL removes progressive state layer on post-move vests.
Remote IL resident for out-of-state employer still typically IL taxes wages.
Estimated federal tax may be needed even when IL flat is accurate at state level.
Chicago does not add a separate city wage income tax like NYC — state rate page focuses on IL income tax.
tax rate Illinois searches often compare to neighboring Wisconsin or Indiana — each state differs.
Stock options and same IL wage treatment when IL-sourced.
Boxes 16–17 include in IL wages when IL payroll applies.
Legislative changes — confirm rate for filing year on IL DOR site.
Trading and fintech vests follow same payroll wage rules.
What to check
- IL state on pay stub.
- IL wage and tax boxes.
- Federal Box 1 and .
- IL flat rate times estimated taxable income for rough state tax.
- Federal gap vs .
- Move date if part-year IL.
- Calculator output vs pay stub.
- Illinois DOR pub for current year.
Assuming Illinois flat tax means RSU vest withholding covers your full tax bill
What to check in your documents
- IL pay stub.
- IL boxes.
- confirmation.
- IL estimated tax if made.
- Move docs if part-year.
Chicago employee with annual RSU stack
Illustration only, not your tax situation.
Questions people ask
- What is the RSU tax rate in Illinois?
- IL flat state rate on wages plus federal marginal tax plus FICA — verify current IL rate for your filing year.
- Are RSUs taxed in Illinois?
- Yes — is IL wage income for typical IL residents.
- Illinois vs Indiana RSU tax?
- Both states tax wages including vests — rates and reciprocity rules differ; see state comparison tools.
- IL RSU supplemental withholding?
- Employers IL and federal on — federal supplemental may still under- vs .
- Moved from Illinois to Florida?
- IL may tax pre-move connected income. Post-move FL vests avoid FL state income tax for typical residents.
- Remote worker in Illinois RSU tax?
- IL resident generally owes IL tax on wages.
- Which calculator for IL RSU?
- tax calculator with Illinois selected and gap for federal layer.
- W-2 IL boxes for RSU?
- State wage and tax boxes reflect when IL payroll applies.
- FICA on Illinois RSU vest?
- Federal FICA on until wage base cap.
- Related guides?
- Illinois tax guide, moving states overview, effective tax rate, state tax comparison calculator.
When to get help from a tax pro
- Part-year IL resident with equity from two states.
- Employer withheld wrong state on IL resident .
- Multi-state remote work allocation.
- Reciprocal state commuter questions.
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
- Illinois RSU Tax Guide
Illinois taxes RSU vest income as wages; part-year residency applies if you move in or out.
- RSU Tax Rate in Colorado
Colorado applies flat state income tax to RSU vest wages — federal marginal tax and FICA still apply on top.
- 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.
- 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.
- RSUs and Marginal Tax Rates
RSU vest income stacks on salary — your marginal rate on that vest slice may be higher than flat withholding.
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.
Illinois flat individual income tax on vest wages; confirm current IL DOR rate.
- Illinois DOR — Individual Income Tax
Illinois Department of Revenue · Official
Illinois 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.