ESPP Disqualifying Disposition: Ordinary Income and Cost Basis Reporting

An ESPP disqualifying disposition is what the IRS calls it when you sell, gift, or transfer shares from a qualified Employee Stock Purchase Plan before meeting the required holding periods. The consequence is that the discount you got at purchase gets taxed as ordinary income at rates up to 37% instead of the lower long-term capital gains rate, and your broker’s 1099-B will almost certainly report the wrong cost basis, which you have to fix on Form 8949 to avoid paying tax twice on the same money.¹

What Counts as a Disqualifying Disposition

To qualify for favorable tax treatment under a Section 423 plan, you must hold the shares for more than one year after the purchase date and more than two years after the offering date (the date the offering period began).² Miss either deadline and the sale is disqualifying.

An example. Your offering period started January 1, 2025, and you purchased shares on June 30, 2025. The earliest you can sell with qualifying treatment is after June 30, 2026 (one year from purchase) and after January 1, 2027 (two years from the offering date). Selling on December 15, 2026 clears the one-year hurdle but misses the two-year one. Disqualifying.

“Disposition” isn’t limited to a sale on the open market. Gifting shares or transferring ownership to someone else before the holding periods run triggers the same result. Moving shares between your own brokerage accounts doesn’t count, because ownership hasn’t changed hands.

How the Ordinary Income Is Calculated

In a disqualifying disposition, the ordinary income equals the stock’s fair market value on the purchase date minus the price you actually paid.³ That’s the full “bargain element” at the moment of purchase, and it’s typically larger than what a qualifying disposition would produce.

The reason is the lookback provision common in ESPPs. A lookback sets your purchase price at the plan discount applied to the lower of the stock price on the offering date or the purchase date. If the stock rose between those two dates, your effective discount is bigger than the stated percentage. In a qualifying disposition, ordinary income is limited to the discount measured from the offering-date price. In a disqualifying one, you owe ordinary income on the full spread between what you paid and what the stock was worth on the day you bought it.

No FICA, No Withholding

The ordinary income shows up in Box 1 of your W-2 alongside your salary, but it is not subject to Social Security or Medicare taxes. Federal law specifically exempts ESPP-related income from FICA and FUTA.⁴⁵

Your employer is also not required to withhold federal income tax on this amount. The statute explicitly says no amount needs to be deducted and withheld.² The income gets reported on your W-2, but nothing is taken out of your paycheck to cover the tax. You’re on the hook for paying it another way, which is where a lot of people get surprised at filing time.

A Worked Example

Same setup as above. Offering period began January 1, 2025. Purchase on June 30, 2025. Sale on September 30, 2025, well before either holding period is met. The plan has a 15% discount with lookback.

Stock price on offering date (Jan 1): $40.00
Stock price on purchase date (Jun 30): $55.00
Your purchase price (85% of $40.00): $34.00
Sale price (Sep 30): $60.00

Ordinary income. $55.00 fair market value at purchase minus $34.00 purchase price equals $21.00 per share. Taxed as compensation.³

Adjusted cost basis. Your basis becomes your purchase price plus the ordinary income already recognized: $34.00 + $21.00 = $55.00. This is what keeps the $21.00 from being taxed twice.

Capital gain. $60.00 sale price minus $55.00 adjusted basis equals $5.00 per share. Because you held less than a year, it’s a short-term capital gain, taxed at ordinary rates.

Total taxable: $26.00 per share. On 100 shares, that’s $2,600 in taxable income. At a 24% marginal rate, about $624 in federal tax.

What If the Stock Dropped Before You Sold

The math shifts when the stock declined after purchase, and it can feel counterintuitive.

Sale price between your purchase price and the purchase-date FMV. Say you sold at $45.00 instead of $60.00. The ordinary income is still the full $21.00 spread at purchase. Your adjusted basis is still $55.00. But the sale price is below basis, so you have a $10.00 per share capital loss ($45.00 − $55.00). You’d report $21.00 of ordinary income and a $10.00 capital loss that can offset other gains, even though your total economic gain on the trade was only $11.00.

Sale price below your purchase price. If you sold at $30.00 when you paid $34.00, you lost money on the deal. Ordinary income recognition is generally limited in this scenario because there’s no actual economic gain, and the capital loss is calculated from the adjusted basis. This interaction is complex enough that talking to a tax professional is worth the fee.

Reporting the Sale Without Getting Taxed Twice

The paperwork is where most people lose money they don’t owe. Three forms matter.

Form W-2

Your employer should include the ordinary income from the disqualifying disposition in Box 1 for the year of the sale. It’s lumped in with regular wages and won’t be broken out on the form itself. Cross-check the amount against the supplemental statement from your plan administrator. If the employer didn’t include it, you still have to report it, on Schedule 1 (Form 1040), line 8k.³

Form 1099-B and the Cost Basis Trap

Your broker’s 1099-B reports the sale proceeds and a cost basis. That basis is almost always just your original purchase price, not the adjusted basis. In the example, the 1099-B shows $34.00, but your correct basis is $55.00. Enter the 1099-B numbers as-is and you’ll pay capital gains tax on the full $26.00 per share on top of the $21.00 already reported as wages on the W-2. Double tax on the $21.00.

Form 8949 to Fix the Basis

Form 8949 is the reconciliation.⁶ For the sale entry:

Column (e): the cost basis from the 1099-B ($34.00 in the example).
Column (f): code “B” to flag the reported basis as incorrect.⁷
Column (g): the difference between the correct basis and the reported basis, entered as a negative in parentheses. Correct basis ($55.00) is higher than reported basis ($34.00), so ($21.00).⁷

The negative adjustment in column (g) reduces the reported capital gain by the amount already taxed as wages. The corrected figure flows to Schedule D, so only the true $5.00 per share capital gain is taxed there.⁸ Skipping this adjustment is the single most common ESPP filing mistake, and it always costs the taxpayer.

Form 3922: Keep It

Your employer files Form 3922 for each ESPP purchase where the price was less than 100% of the stock’s value on the grant date.⁹ It lists the offering date, purchase date, fair market values on both dates, and the price you paid. Every number in the calculations above comes from this form. Reconstructing it later from brokerage statements is painful.

Avoiding an Underpayment Penalty

Because nothing is withheld on the ordinary income, a large disqualifying disposition can leave you significantly underpaid for the year. The IRS wants tax paid as income is earned, not in one lump at filing. If you owe more than $1,000 at filing, you may face an underpayment penalty unless you hit a safe harbor: paying at least 90% of the current year’s tax liability during the year, or 100% of the prior year’s liability (110% if your prior-year AGI was over $150,000).

The simplest fix after a sale is to file an updated Form W-4 with your employer to increase paycheck withholding. Otherwise, make a quarterly estimated payment. For 2026, the due dates are April 15, June 15, and September 15 of 2026, and January 15, 2027. A sale in the second quarter should be covered by a payment by the June 15 deadline; waiting until year-end can trigger penalties for the earlier quarters even if you settle the full balance by April.

One Situation That Isn’t Disqualifying

If an employee dies while holding ESPP shares, the holding period requirements are waived. The estate or heir can dispose of the shares without the usual timing rules applying.¹⁰ Everything above assumes a living shareholder selling their own shares.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Office of the Law Revision Counsel. 26 USC 421 – General Rules
3
Internal Revenue Service. Stocks (Options, Splits, Traders) 5
4
Internal Revenue Service. 2026 Publication 15-B
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Internal Revenue Service. 4.23.5 Technical Guidelines for Employment Tax Issues
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Internal Revenue Service. About Form 8949, Sales and Other Dispositions of Capital Assets
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Internal Revenue Service. Form 8949 Codes
8
Internal Revenue Service. Form 8949 – Sales and Other Dispositions of Capital Assets
9
Internal Revenue Service. About Form 3922, Transfer of Stock Acquired Through an Employee Stock Purchase Plan Under Section 423(c)
10
Office of the Law Revision Counsel. 26 USC 421 – General Rules