What is an employee stock purchase plan (ESPP)? Definition, how it works and examples
Buying your employer’s shares through payroll at a discount — how offering periods and the lookback work, why ESPPs are mostly a public-company benefit, and the tax on a sale.
The short answer
What is an ESPP? An employee stock purchase plan lets you buy your employer’s shares through payroll deductions, usually at up to a 15% discount and often at the lower of two prices. A qualified plan under Section 423 adds tax rules: no tax at purchase, and a better result if you hold the shares long enough. The plan only works well where there is a market price on every purchase date and a market to sell into afterwards. That is why ESPPs are mostly a public-company benefit.
How does the ESPP work?
A plan runs in offering periods. On the first day of an offering you are, in tax terms, granted an option. During the offering the company takes money from each paycheck and holds it. On each purchase date it uses the accumulated money to buy whole shares for you at the plan price, and the shares land in your brokerage account. Under the regulations, the grant date is the first day of the offering. The price is where the value sits.
What is an ESPP deduction on my paycheck?
The ESPP deduction on your paystub is your own money, set aside to buy shares on the next purchase date. It is taken after tax: the contribution does not reduce your taxable wages, and your basis in the shares is the price you pay for them. If you leave or withdraw before a purchase date, most plans return the money held so far. What is ESPP enrollment, and how is the contribution set? ESPP enrollment happens before an offering starts, in a window the company announces. You choose an ESPP contribution, usually as a percentage of pay, up to the plan’s cap.
What is ESPP tax, and when is it due?
Under a qualified plan nothing is taxed when you enrol or when shares are bought. The tax comes in the year you sell, and how much of the gain is ordinary income depends on whether the sale is a qualifying disposition. That needs both: more than two years from the offering date, and more than one year from the purchase date. Qualifying disposition Ordinary income is the lesser of the discount measured at the offering date or your actual gain. The rest is long-term capital gain.
Worked example: one purchase, two ways to sell
An offering starts with the stock at $20. You contribute $10,000 over six months. On the purchase date the stock is $30. With a 15% discount and a lookback, the price is 85% of $20 — $17 — so you buy 588 shares. Your limit for the year is $25,000 ÷ $20, or 1,250 shares, so the purchase fits. You later sell at $35. The gain is the same. The split is not: the quick sale turns $7,644 into ordinary income, the patient one only $1,764. The cost of waiting is the price risk on $20,580 of one employer’s stock for well over a year.
Why private companies rarely run an employee stock purchase plan
Nothing in Section 423 requires a listed company. A private company employee stock purchase plan is possible, and a few exist. Four practical problems explain why they are rare. First, the price: every purchase date needs a fair market value, and without a market that means an appraisal like the 409A valuation used for option prices. Second, securities law.
Section 423 rules as of October 2026
Common mistakes with an ESPP
Counting the holding period from purchase only A qualifying sale needs two years from the offering date as well as one year from purchase. Check both dates on Form 3922. Using the broker’s basis The 1099-B usually shows only what you paid. The ordinary income on your W-2 must be added on Form 8949, or the same income is taxed twice. Expecting withholding to cover it Nothing is withheld on ESPP income. A large disqualifying sale can leave a bill in April. Holding for tax and ignoring concentration Salary, unvested awards and ESPP shares all depend on one company.
The terms this page uses
Employee stock purchase plan (ESPP) A plan that lets employees buy company shares from payroll deductions, usually at a discount. A qualified plan meets Section 423. Offering period The span over which contributions are collected under one grant. The first day is the grant date for tax purposes. Purchase date The day the accumulated contributions buy shares at the plan price. An offering may have several. Lookback A price set on the lower of the value at the offering date and at the purchase date, before the discount.
Questions about ESPPs
What is ESPP on my paycheck? It is the after-tax amount taken from each paycheck to buy shares on the next purchase date. It does not lower your taxable wages. Most plans return the money if you withdraw or leave before the purchase. Is an ESPP discount free money? Only if you sell at the purchase-date price. The discount is real, but once you hold the shares you carry the same price risk as any other shareholder, and the discount is taxed as ordinary income in the year you sell. What are ESPP shares worth if I leave the company?
What is ESPP on my paycheck?
It is the after-tax amount taken from each paycheck to buy shares on the next purchase date. It does not lower your taxable wages. Most plans return the money if you withdraw or leave before the purchase.
Is an ESPP discount free money?
Only if you sell at the purchase-date price. The discount is real, but once you hold the shares you carry the same price risk as any other shareholder, and the discount is taxed as ordinary income in the year you sell.
What are ESPP shares worth if I leave the company?
Shares already bought are yours and keep their value and tax history. Contributions not yet used are normally refunded, and you can no longer take part in new offerings.
Can a private company offer an ESPP?
Yes, Section 423 does not require a listing, but it is rare. The company needs a fair market value on every purchase date, a securities-law exemption for each sale, and employees accept shares they usually cannot sell until a tender offer or an exit.
Do I need to report ESPP shares when I sell?
Yes. You report the sale on Form 8949 and Schedule D, using Form 3922 for the dates and prices, and you add the ordinary income from your W-2 to the basis shown by the broker.
Where every rule on this page comes from
Every rule and limit was checked against the US Code, the Treasury regulations and the IRS on 2 October 2026 and applies to tax year 2026. Plan terms vary by company and are described as such. The worked example is illustrative arithmetic, not market data.