Interactive Equity Compensation Tool · Zero Cost
RSU Withholding Gap &
RSU Withholding Gap &
Double-Tax Refund Calculator
Employers typically withhold only 22% federal tax when your RSUs vest, even when your true marginal rate is 32%–37% + 0.9% Medicare. Worse, unadjusted Form 1099-B Box 1e cost basis causes thousands of tech workers to pay tax on vested RSUs twice.
Step 1 · Enter Your Compensation & RSU Vests
Configure Your Equity Profile
$260,000
$100,000
$300,000
$550,000
$800,000
$150,000
$20,000
$250,000
$500,000
$1,000,000
Documented Fast Close AI Result: $15,000+ Refund & $14,800 Saved
We routinely recover $10,000–$25,000+ via Form 1040-X amended returns for engineers whose 1099-B Box 1e cost basis was reported as $0. Read our RSU & Equity Tax Pillar Guide →
Step 2 · Real-Time Withholding & Audit Output
Projected April Under-Withholding Gap
$20,850
13.9% Under-Withheld on $150,000 RSU Vests
3-Year Prior Return Double-Tax Refund Opportunity
Up to $36,000 Overpaid Tax Exposure
If your prior 1099-B forms had unadjusted Box 1e basis on similar RSU sales, a 3-year CPA Form 1040-X audit can recover double-paid capital gains tax.
Total Combined Compensation
$410,000
True Marginal Federal Rate (+0.9% Add. Medicare)
35.9%
Employer Federal Tax Withheld at Vest
$33,000
Actual Federal + Add. Medicare Tax Owed on RSUs
$53,850
Book a $350 Equity & 3-Year Lookback Review →
Get our Form 8949 RSU Basis Checklist + CPA equity tax updates: