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RSU taxes for dual-income tech couples

Two RSU incomes in one household can compress brackets faster. coordinate W-4 and estimated payments.

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When both partners have income, your combined wages can reach higher brackets and surtax thresholds faster than either of you would alone. Because each employer withholds as if it were your only income, the household total can be under-withheld.

Why this happens

Filing jointly combines both incomes, so the top dollars can land in higher brackets.

Each employer withholds based only on what it pays, not your household total.

Surtax thresholds for higher earners are based on combined income for joint filers.

Two sets of vests can stack large supplemental income into one year.

What to check

  • Your combined projected wages including both partners' vests.
  • Whether the household total reaches higher brackets or surtaxes.
  • Whether either W-4 should account for the other's income.
  • Coordination of estimated payments across the household.
  • State implications if you move together.

Common mistake

Each partner assuming their own is enough. Joint filing combines incomes, so two individually 'covered' vests can still leave the household under-withheld.

Example scenario (hypothetical)

Illustration only, not your tax situation.

Example: two partners each $80,000, each withheld at a flat rate as if it were their only income. Filed jointly, the combined $160,000 of income sits in a higher bracket, producing a balance due.

When to get help from a tax pro

  • Both partners have significant equity income.
  • You are deciding how to set each W-4.
  • You may cross a surtax threshold jointly.
  • You are planning a move together.

Related calculators

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.