Is my trade a wash sale under IRS rules?

Check whether a sale likely triggers the IRS wash-sale rule by comparing loss sales and repurchases within 30 days. Enter sale and repurchase dates to see if the loss is disallowed and how the basis adjustment may work.

No login required.

How this calculation works

  • Checks for repurchases within 30 days before or after a loss sale.
  • Flags potential disallowed losses under wash sale rules.
  • Estimates how the loss may adjust cost basis.

Common mistakes and caveats

  • Substantially identical securities can trigger wash sale rules.
  • This tool is a screening estimate; confirm with tax records.

FAQ

Does a wash sale eliminate the loss forever?

No. The disallowed loss is generally added to the basis of the replacement shares.

Last updated & sources

Last updated January 26, 2026.

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