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RSU taxes when equity is a big share of your pay

When RSUs are a large share of pay, withholding gaps and surtaxes deserve a deliberate plan.

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When are a large part of your compensation, two things deserve a plan: the gap from flat rates, and surtaxes that can apply at higher income. Both are manageable if you estimate them before the bill arrives, not after.

Why this happens

Flat can be well below your , creating a large gap in dollar terms.

Additional Medicare tax and net investment income tax can apply at higher income levels.

Multiple vests and other income compound the gap across the year.

Closing the gap is easier with extra or estimated payments than with a single April payment.

What to check

  • Your full-year income including all vests and household income.
  • The flat rate vs. your .
  • Whether surtaxes apply to you this year.
  • Whether estimated payments or extra is the cleaner fix.
  • Your concentration in company stock.

Common mistake

Treating each as covered because tax was withheld. At higher incomes, flat routinely trails the real rate, and surtaxes add to the gap.

Example scenario (hypothetical)

Illustration only, not your tax situation.

Example: a high earner expects $300,000 of vests withheld at a flat rate. The plus surtaxes is higher, so they estimate the shortfall mid-year and raise or pay estimates to avoid a large April bill.

When to get help from a tax pro

  • Equity is a large share of your pay.
  • Surtaxes likely apply to you.
  • You want a repeatable estimated-payment routine.
  • You are deciding when to diversify concentrated stock.

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Related pages

For learning, not filing

Grants, employers, and states all differ. Use your own documents and a qualified tax professional before you make decisions from this guide.