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Found a calculation error? Have a question about how something works? Want to suggest a feature? We read everything.

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Reporting a calculation error

If you believe our calculators are producing incorrect results, please include:

The calculator you used
Filing year and status
The key inputs (salary, grant details)
The result you expected and why

We'll investigate against the IRS source documents and respond.

Common topics

AMT calculationISO exerciseRSU withholdingState taxes2026 OBBBA changesFeature requestCalculation discrepancy

Not a tax advisor

We can explain how our calculators work, but we're not able to provide personalized tax advice. For complex equity situations, consult a CPA who specializes in this area.