Wash Sale Adjustment Calculator

Wash Sale Adjustment Calculator. An investor enters sale proceeds, basis, shares sold, replacement shares, replacement cost, the 30-day flag, and a rate to estimate disallowed loss and adjusted basis. Use it after a loss sale when a similar security was bought around the sale date.

Inputs

Note

Investments & Capital Gains inputs

Sale proceeds ($)

Range: 0–100,000,000 $

Enter a non-negative US-dollar amount for the stated tax year; use the same tax year and jurisdiction for all related inputs. Professional example: 8000. Edit this value for your own facts.

Adjusted basis of shares sold ($)

Range: 0–100,000,000 $

Enter a non-negative US-dollar amount for the stated tax year; use the same tax year and jurisdiction for all related inputs. Professional example: 12000. Edit this value for your own facts.

Shares sold

Range: 0–100,000,000

Enter the count or numeric assumption in the unit stated by the label. Professional example: 100. Edit this value for your own facts.

Replacement shares bought within 30 days

Range: 0–100,000,000

Enter the count or numeric assumption in the unit stated by the label. Professional example: 100. Edit this value for your own facts.

Cost of replacement shares ($)

Range: 0–100,000,000 $

Enter a non-negative US-dollar amount for the stated tax year; use the same tax year and jurisdiction for all related inputs. Professional example: 8500. Edit this value for your own facts.

Buyback within 30 days (1=yes, 0=no)

Range: 0–1 1=yes, 0=no

Enter the count or numeric assumption in the unit stated by the label. Professional example: 1. Edit this value for your own facts.

Applicable tax rate (%)

Range: 0–100 %

Enter a percentage as a whole number, such as 22 for 22%, not 0.22. Professional example: 22. Edit this value for your own facts.

Result

Current Tax Savings

440.00

Realized Loss

4,000.00

Estimate

Allowed Loss

2,000.00

Disallowed Loss

2,000.00

New Basis

6,250.00

How to interpret this result

Wash Sale Adjustment Calculator starts with a professional planning example for this scenario. Edit the inputs to replace the example with your own facts; the displayed outputs update from the formula.

Applicability and limits

This is a simplified share-based adjustment. It does not determine substantially-identical status, partial matching, spouse or IRA attribution, broker reporting, or Form 8949 entries.

Calculation basis

Only the named inputs and displayed formula relationships are used. Rates, limits, thresholds, eligibility flags, dates, and jurisdiction assumptions are not silently looked up unless a verified dataset is listed.

Formula

Calculation logic

Formula definitions and substituted values.

Realized Loss

max(Adjusted basis of shares sold ($) - Sale proceeds ($), 0)

max(Adjusted basis of shares sold ($) - Sale proceeds ($), 0)

Replacement Fraction

min(Replacement shares bought within 30 days / max(Shares sold, 1), 1)

min(Replacement shares bought within 30 days / max(Shares sold, 1), 1)

Disallowed Loss

Realized Loss * Replacement Fraction * Buyback within 30 days (1=yes, 0=no)

Realized Loss * Replacement Fraction * Buyback within 30 days (1=yes, 0=no)

Allowed Loss

Realized Loss - Disallowed Loss

Realized Loss - Disallowed Loss

New Basis

Cost of replacement shares ($) + Disallowed Loss

Cost of replacement shares ($) + Disallowed Loss

Current Tax Savings

Allowed Loss * Applicable tax rate (%) / 100

Allowed Loss * Applicable tax rate (%) / 100

How to interpret this result

Wash Sale Adjustment Calculator starts with a professional planning example for this scenario. Edit the inputs to replace the example with your own facts; the displayed outputs update from the formula.

Applicability and limits

This is a simplified share-based adjustment. It does not determine substantially-identical status, partial matching, spouse or IRA attribution, broker reporting, or Form 8949 entries.

This is a simplified share-based adjustment. It does not determine substantially-identical status, partial matching, spouse or IRA attribution, broker reporting, or Form 8949 entries.

Calculation basis

Only the named inputs and displayed formula relationships are used. Rates, limits, thresholds, eligibility flags, dates, and jurisdiction assumptions are not silently looked up unless a verified dataset is listed.

What to check

An investor enters sale proceeds, basis, shares sold, replacement shares, replacement cost, the 30-day flag, and a rate to estimate disallowed loss and adjusted basis.
Use it after a loss sale when a similar security was bought around the sale date.
This is a simplified share-based adjustment. It does not determine substantially-identical status, partial matching, spouse or IRA attribution, broker reporting, or Form 8949 entries.