ESPP Disqualifying Disposition Calculator 2026 β Section 423 Tax
Calculate ESPP disqualifying disposition taxes under Section 423. Determine ordinary income, capital gain, lookback discount, and compare qualified vs disqualified outcomes.
ESPP Purchase Details
$
Stock price at start of offering period $
Stock price on the purchase date %
Typically 15% for Section 423 plans $
Dates & Tax Rates
%
$0
Ordinary Income (W-2)
$0
Effective Purchase Price
$0
Total Federal + State Tax
$0
After-Tax Proceeds
ESPP Disqualifying Disposition Breakdown
How ESPP Disqualifying Dispositions Are Taxed
Under Section 423, the discount you received through the ESPP is a compensation benefit from your employer. In a disqualifying disposition, the IRS taxes this discount as ordinary W-2 income in the year of sale. Any additional gain above the discount is taxed as a capital gain (short-term if held less than 1 year from purchase).
The Formula (with Lookback)
Lookback Price = MIN(Grant Date FMV, Purchase Date FMV)
Purchase Price = Lookback Price Γ (1 β Discount%)
Discount at Purchase = FMV at Purchase β Your Purchase Price
Actual Gain = Sale Price β Purchase Price
Ordinary Income = MIN(Discount at Purchase, Actual Gain)
Capital Gain = Actual Gain β Ordinary Income
Purchase Price = Lookback Price Γ (1 β Discount%)
Discount at Purchase = FMV at Purchase β Your Purchase Price
Actual Gain = Sale Price β Purchase Price
Ordinary Income = MIN(Discount at Purchase, Actual Gain)
Capital Gain = Actual Gain β Ordinary Income
Example
200 shares, grant price $40, FMV at purchase $55, 15% discount, sale price $70:
Lookback price: MIN($40, $55) = $40
Purchase price: $40 Γ 85% = $34/share
Discount: $55 β $34 = $21/share Γ 200 = $4,200
Actual gain: ($70 β $34) Γ 200 = $7,200
Ordinary income: MIN($4,200, $7,200) = $4,200
Capital gain: $7,200 β $4,200 = $3,000 (short-term)
Lookback price: MIN($40, $55) = $40
Purchase price: $40 Γ 85% = $34/share
Discount: $55 β $34 = $21/share Γ 200 = $4,200
Actual gain: ($70 β $34) Γ 200 = $7,200
Ordinary income: MIN($4,200, $7,200) = $4,200
Capital gain: $7,200 β $4,200 = $3,000 (short-term)
Sources and References (click to expand)
Extended
ESPP Qualified vs Disqualified Comparison & Multi-Cycle Table
Side-by-side tax comparison, after-tax proceeds SVG bar chart, multi-purchase cycle analysis table
Compare qualified vs disqualified dispositions for multiple ESPP purchase cycles. All calculations use 15% LTCG, 24% ordinary, 5% state.
After-Tax Proceeds by Purchase Cycle
| Cycle | Shares | Purchase Price | Discount | Tax (Qualified) | Tax (Disqualified) | Savings |
|---|
Frequently Asked Questions
What is an ESPP disqualifying disposition?
An ESPP (Employee Stock Purchase Plan) under Section 423 has a disqualifying disposition when you sell shares before holding them for: (1) more than 2 years from the grant (offering) date, AND (2) more than 1 year from the purchase date. Selling before either deadline converts the discount portion from potential long-term capital gains to ordinary income.
How does the ESPP lookback feature work?
Many ESPP plans include a lookback provision: your purchase price is 85% of the LOWER of the stock price at the start of the offering period (grant date) or the end (purchase date). This maximizes your discount. For tax purposes, the "grant price" for Section 423 is based on this lookback price, which affects how ordinary income is calculated.
What is ordinary income in an ESPP disqualifying disposition?
In a disqualifying disposition, ordinary income equals the LESSER of: (1) the discount at purchase (FMV at purchase minus your purchase price), or (2) your actual gain at sale (sale price minus purchase price). If you sell at a loss below your purchase price, there may still be ordinary income equal to the discount, with an offsetting capital loss.
Does the employer withhold taxes on ESPP disqualifying dispositions?
Yes. The ordinary income portion must be reported as W-2 wages in the year of sale. The employer must withhold federal income tax, FICA (Social Security and Medicare), and applicable state taxes on the ordinary income amount. This is different from a qualifying disposition where there is no W-2 reporting.
What is a qualifying ESPP disposition and how is it taxed?
A qualifying disposition (held both periods) results in: ordinary income equal to the lesser of the grant-date discount or actual gain, PLUS long-term capital gains on any additional appreciation. The key tax benefit is that most of the appreciation is taxed at favorable LTCG rates instead of ordinary income rates, and the employer does not withhold FICA on the transaction.