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AI-Powered Market Intelligence
Understand the reason behind any stock move.
Quantify potential disallowed loss from overlapping repurchases.
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Wash Sale Loss Calculator
Calculate disallowed loss from wash-sale share overlap.
Use this deterministic wash-sale estimator to compute disallowed loss based on sold-at-loss shares repurchased inside wash-sale window.
Results
Disallowed wash-sale loss
$540.00
Estimated disallowed loss is $540.00 from 120 overlapping shares.
- Total realized loss
- $900.00
- Disallowed loss
- $540.00
- Potentially allowed loss
- $360.00
- Disallowed shares
- 120
Formula
Disallowed Loss = min(Sold-at-loss Shares, Repurchased Shares) × Loss per Share
Example
- Shares sold at loss: 200
- Repurchased shares within window: 120
- Loss per share: 4.5
What does this mean?
- •Disallowed portion is tied to overlap between sold and repurchased shares.
- •Remaining non-overlap loss may still be currently deductible.
- •Tax treatment details vary by jurisdiction and account structure.
Estimate wash-sale disallowance clearly
Quantify potential disallowed loss from overlapping repurchases.
What is a wash sale loss?
Use this deterministic wash-sale estimator to compute disallowed loss based on sold-at-loss shares repurchased inside wash-sale window. In practice, this means you can quantify wash sale loss using shares sold at loss, repurchased shares within window, and loss per share without relying on hidden assumptions or black-box scoring.
Primary input set for this calculator: Shares sold at loss, Repurchased shares within window, Loss per share.
How to calculate wash sale loss
- 1.Step 1: Enter shares sold at loss with the timeframe/context you want to evaluate.
- 2.Step 2: Enter repurchased shares within window with the timeframe/context you want to evaluate.
- 3.Step 3: Enter loss per share with the timeframe/context you want to evaluate.
- 4.Step 4: Apply formula Disallowed Loss = min(Sold-at-loss Shares, Repurchased Shares) × Loss per Share.
- 5.Step 5: Interpret output together with risk, liquidity, and catalyst context.
Why this metric matters
This metric turns trade assumptions into explicit numbers for sizing, entry/exit planning, and portfolio discipline.
Pair this calculator with catalyst context from headlines, filings, and options flow to avoid relying on isolated numbers.
When to use this calculator
- ✓Before opening a new position where wash sale loss impacts sizing or risk.
- ✓After a catalyst to quantify how much conditions changed versus your baseline.
- ✓When comparing setups across multiple tickers with one consistent formula.
- ✓During weekly review to keep decision-making tied to measurable inputs.
Common scenarios
Disallowed portion is tied to overlap between sold and repurchased shares
Use this wash sale loss workflow to quantify this scenario with deterministic inputs.
Remaining non-overlap loss may still be currently deductible
Use this wash sale loss workflow to quantify this scenario with deterministic inputs.
Tax treatment details vary by jurisdiction and account structure
Use this wash sale loss workflow to quantify this scenario with deterministic inputs.
Event reaction review
Recalculate wash sale loss immediately after earnings, filings, or macro headlines.
Interpretation tips
- •Re-run wash sale loss whenever key inputs change materially, not only when price moves.
- •Document assumptions so the same methodology can be repeated across watchlist names.
- •Use this metric as one layer in the decision stack, not as a standalone trade trigger.
Data caveats
- –Outputs are deterministic from your inputs; input quality determines output quality.
- –This page does not auto-adjust for broker fees, taxes, or slippage unless you include them in your assumptions.
- –Validate corporate action details, filing dates, and data freshness before acting on results.
FAQ
How does the wash sale loss calculator work?
Wash Sale Loss Calculator is deterministic and uses only your inputs (shares sold at loss, repurchased shares within window, loss per share). Formula: Disallowed Loss = min(Sold-at-loss Shares, Repurchased Shares) × Loss per Share.
What does this output tell me in practice?
Calculate disallowed loss from wash-sale share overlap. Pair this with a stop-loss and thesis review, not just return math.
Does the wash sale loss calculator use real-time market feeds?
No. This page does not auto-pull live data. You control all inputs and can rerun instantly as market conditions change.
Can I use this result directly for trading decisions?
Use it as a planning layer. Combine with position sizing, liquidity, and catalyst context before any execution.
Related tools
Taxable Gain Calculator→Capital Gains Tax Estimator→Realized Gain/Loss Calculator→Remaining Cost Basis Calculator→
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