See your real ESPP gain and tax bill before you sell.

How to use this ESPP calculator

Enter your offering date price, the FMV on your purchase date, the actual price you paid (usually 85% of the lower of the two), how many shares you bought, and what you sold (or plan to sell) them for. The calculator automatically determines whether your sale is a qualifying or disqualifying disposition and breaks down your exact tax bill — ordinary income, capital gains, FICA, and state tax — so you can see your net profit and effective tax rate before you act.

What is an ESPP?

An Employee Stock Purchase Plan (ESPP) lets you buy company stock at a discount — typically 15% — through payroll deductions. Most plans use a "lookback" feature: you pay 85% of the lower of the stock price at the start of the offering period or the end (purchase date). This means you can profit even if the stock falls, which is what makes a Section 423 ESPP one of the most reliable benefits offered by public companies.

Qualifying vs. disqualifying dispositions: tax impact

How you are taxed on ESPP shares depends almost entirely on when you sell.

Qualifying disposition (QD)

You must hold shares for more than 2 years from the offering date AND more than 1 year from the purchase date. The "bargain element" (the discount you received, measured against the offering-date price) is taxed as ordinary income, but any additional gain above that is taxed at the lower long-term capital gains rate of 0%, 15%, or 20%.

Disqualifying disposition (DQ)

If you sell before meeting both holding requirements, the spread between your purchase price and the FMV on the purchase date is taxed as ordinary income (and shows up on your W-2). Only gains above that purchase-date FMV may qualify as capital gains — short-term if you held the shares a year or less after purchase.

Should you sell ESPP shares immediately?

The guaranteed 15% discount from a Section 423 plan represents an instant, guaranteed return. Selling immediately locks in that profit and eliminates employer stock concentration risk. The downside: the sale is always a disqualifying disposition, so the entire discount is taxed as ordinary income.

If you believe in your employer's stock and are in a low bracket, holding for a qualifying disposition can result in lower total taxes. Use the "what if you had held?" comparison in the calculator above to see the dollar difference in your specific situation — and weigh it against the market risk of staying concentrated in a single stock.

What this calculator does not include

This is a simplified educational estimate. It applies your marginal bracket to the ordinary-income portion and an approximate 0/15/20% long-term rate based on your income, but it does not model the Net Investment Income Tax, the alternative minimum tax, payroll wage caps on Social Security, or the precise interaction of your other deductions and credits. State rules vary widely. Treat the result as a ballpark and confirm specifics with a qualified tax professional before you sell.