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Capital Gains & Tax-Loss Planning Tool

Estimate the tax impact of selling investments, compare sale scenarios, and catch issues worth reviewing before you trade.

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Before You Begin

  • Results are estimates, not tax preparation. This tool uses 2026 federal tax brackets, but doesn't decide whether two securities are "substantially identical" for wash-sale purposes and doesn't recommend trades solely for tax reasons.
  • You're responsible for verifying your own cost basis and any prior basis adjustments, these numbers come from your brokerage statements, not from us.
  • Everything you enter stays in your own browser on this device. We don't send it to a server or store it on our end. Closing your browser's site data, or using "Clear my data" below, permanently deletes it.

Compare a Scenario

A note on guardrails This tool labels results as estimates, not tax preparation, and doesn't decide whether two securities are "substantially identical" for wash-sale purposes, that judgment is yours or your tax preparer's. It doesn't recommend trades solely for tax reasons. You're responsible for verifying your own cost basis and prior adjustments, and federal tax brackets and thresholds shown here are for 2026 and are updated annually.