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RSU tax calculator

RSU vs stock options tax: compare calculators and timing

Options and RSUs follow different tax paths — know which events create wage income vs capital gain.

Rates and rules change. Content is reviewed for tax year 2026. Check the last-reviewed date and methodology on each page, then confirm against IRS or state guidance before you file.

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You hold RSUs and options and want to compare tax timing — there is no single combined calculator, but each grant type has its own tool on this site.

In plain terms

usually tax as wages at — use the tax calculator. may trigger at exercise — use the calculator. tax as wages at exercise — use the exercise tax calculator. Compare timing and forms here, then run the tool that matches your grant.

RSUs vs stock options

Both can be part of your pay, but the tax timing and decisions differ. This is a high-level comparison — your grant documents control.

TopicRSUsStock options
What you receiveShares (or cash) after vest conditions are metThe right to buy shares at a strike price
Typical tax timingWage income at vest for many employeesOften at exercise (NSO) or sale (ISO, if qualifying)
Cash needed for taxEmployer may sell shares (sell-to-cover) for withholdingYou may need cash at exercise even if you do not sell
Price risk before tax eventValue fixed at vest — you receive stock thenSpread depends on price at exercise vs strike
ComplexityUsually simpler — vest, W-2, optional saleISO/NSO rules, AMT, holding periods add layers

Private-company options add liquidity and 409A valuation questions not covered here.

Gather before you start

  • Grant type from your equity portal: , , or .
  • Upcoming or exercise dates.
  • Strike price and for options.
  • Expected value for .

How the tax works

and stock options solve different compensation problems and create different tax timing. are a promise of shares on a schedule — when shares deliver, is wage income on your in the year. You do not choose when ; payroll withholds and reports the income automatically.

Stock options give you the right to buy shares at a strike price. Tax timing follows your exercise decision, not a fixed delivery. tax spread at exercise as wages on your with . may defer regular wage tax on spread but trigger on Form 6251 — often with no employer and no sale proceeds.

There is no single options-vs- calculator because the mechanics differ too much. tax centers on , supplemental rates, and later sales with basis equal to price. tax centers on exercise spread, , Form 3921, and qualifying vs disqualifying disposition holding periods. tax mirrors wage income at exercise like a bonus.

Selling shares after either path uses , Form 8949, and Schedule D. basis generally equals already on your . Option basis generally starts at exercise price plus any amount already taxed as wages or preference. Importing with wrong basis is a common mistake across both grant types.

Many employees hold and options in the same year. Income stacks on one Form 1040 — a large can push spread or into higher brackets. Model each grant with the matching calculator, then look at combined cash needs: gaps vs option exercise tax vs discount wages if you also buy through a plan.

What to check on your end

  • Which grant types you hold in the same year.
  • Cash needed for option exercise tax vs gaps.
  • Whether you can sell to cover on but not on illiquid options.
  • Forms: for / wages, Form 3921 for exercises, for sales.

Looking for one options vs RSU calculator

Tax rules differ too much for one slider. Use the tax calculator for vests and the or calculator for exercises — then compare outcomes side by side with your own spreadsheet if needed.

What to pull from your files

  • Grant agreements labeling vs vs .
  • confirmations for .
  • Exercise confirmations and Form 3921 for .
  • wage detail for exercises.

Example scenario (hypothetical)

Illustration only, not your tax situation.

Example: One employee vests $50,000 — run the tax calculator. A colleague exercises with $50,000 spread — run the exercise tax calculator. An founder with models before exercise with the calculator. Same headline value, three different tools.

Questions people ask

Is there an options vs RSU calculator?
Not as one tool. Use the tax calculator for estimates and the or exercise calculator for options. This page explains when each applies.
Which is taxed first — RSUs or stock options?
tax at when shares deliver. Options tax when you exercise ( wages or ). You control option timing; timing follows the schedule.
Are RSUs or ISOs simpler at tax time?
are usually simpler timing ( = ). can be cheaper in theory but at exercise adds complexity. are more straightforward than but create wage tax at exercise.
Can I have RSUs and options in one year?
Yes. Income stacks on one return. Model each grant with the matching calculator and watch total bracket effects.
What forms differ between RSUs and ISOs?
flow through at and on sale. exercises use Form 3921 and may trigger Form 6251 ; disqualifying sales add wages. exercises add wages at exercise like a bonus.

When a CPA is worth it

  • Offer letter compares value vs option grant value.
  • You exercise the same year heavily.
  • You are leaving with both unvested and unexercised options.
  • Private company liquidity limits your ability to pay tax.

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.

RSU vest wages vs ISO/NSO exercise timing and calculator comparison.

Related calculators

Related pages

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.

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