Paste your trade history as CSV and we will flag every wash sale under the IRS 30-day rule — including the disallowed losses.
Each line: date,ticker,action(buy/sell),shares,price,costBasis(per share, sell only)
| Date | Ticker | Loss | Status |
|---|
Flags any buy of the same ticker within 30 days before or after a loss sale.
No file upload needed — just paste your broker export.
Shows each flagged pair with dates, ticker and the disallowed amount.
Totals disallowed vs allowed losses so you know your true deduction.
Run through a typical scenario with the sample values below — hit See an example to load them instantly.
| Input | Sample value |
|---|---|
| Trade History (CSV) | 2025-01-05,AAPL,buy,100,180.5, 2025-01-20,AAPL,sell,100,170,175 2025-02-10,AAPL,buy,100,172, 2025-03-01,MSFT,sell,50,400,390 |
Follow the steps below to get accurate results.
Trade History (CSV) · e.g. date,ticker,action,shares,price,costBasis
2025-01-05,AAPL,buy,100,180.5,
2025-01-20,AAPL,sell,100,170,175
2025-02-10,AAPL,buy,100,172,
2025-03-01,MSFT,sell,50,400,390Paste your trade history as CSV and we will flag every wash sale under the IRS 30-day rule — including the disallowed losses.
Wash Sale CSV Checker is an interactive estimate built for quick planning. Always double-check the numbers that matter before acting on them, and reach out to a professional for personalized advice.
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Simply fill in the fields and press Calculate. Paste your trade history as CSV and we will flag every wash sale under the IRS 30-day rule — including the disallowed losses.
Just the basics — Trade History (CSV), plus a few simple inputs. No account or signup is required; everything runs in your browser.
Yes — completely free, with no login, no watermarks and no limits. Bookmark it and share the URL with anyone who needs it.
The calculator uses current, standard formulas to produce an educational estimate. Real-world figures can vary based on your specific situation, so treat it as a planning aid rather than a final answer.
Absolutely. The tool is fully responsive and works smoothly on mobile, tablet and desktop browsers.
The result is an estimate for educational purposes only and is not financial, legal or tax advice. Consult a qualified professional before making important decisions.