Most traders don't realize how bad wash sales hurt until they see the number. Enter your losses and find out exactly what you owe — and how to fix it.
Stock TradersOptions TradersDay TradersFree Tool2 min
📉 Your Trading Losses
Sum of all losing trades you closed (check your 1099-B)
$
The amount your broker flagged as disallowed (box 1g on 1099-B)
$
What Is the Wash Sale Rule?
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The 30-Day Window
Sell at a loss and buy the same or "substantially identical" security within 30 days before or after? The IRS disallows that loss — period.
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The IRA Trap
Wash sales cross accounts. Sell at a loss in your brokerage, repurchase in your IRA within 30 days — the loss is permanently gone.
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Real Tax Cost
Disallowed losses add to your cost basis. Active traders who exit positions by year-end may never recover them — turning paper losses into real taxes.
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The Fix
Futures traders are exempt. Stock/options traders can use Mark-to-Market (IRC §475), time trades carefully, or switch to non-identical securities.
⚠️ Disclaimer: This calculator provides estimates for educational purposes only. Actual wash sale impact depends on specific trade dates, securities, and account types. Consult a licensed tax professional for your situation.
Your Wash Sale Impact
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Your Wash Sale Impact
Based on your inputs
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Fill in your losses above and click Calculate to see your wash sale tax impact.