App simulation

A phone-sized view of the same calculator. iOS and Android change the chrome only — tax math still runs on the server through /calculate.

ESPP Tax

Educational only · not tax advice

Preset, then purchase, sale, and rates.

1 Preset scenario Stock path

2 Purchase

Offer start date Purchase date

Shares purchased

Grant price at start ($) Grant price at end ($)

Plan discount Auto-calculate purchase price (lookback × (1 − discount)) When checked, only purchase price is recalculated from grant prices and discount—not sale price. Purchase price per share ($)

3 Sale

Sale date Shares sold

Sale price per share ($) Type the price yourself. Mouse wheel won’t change dollar fields while they’re focused.

Optional: fill sale price from another field

These buttons only replace sale price per share. They do not change grant or purchase fields.

Sale fees / commission ($)

4 Tax context Plan type Bargain element already reported on W-2 at purchase W-2 bargain amount already reported ($) Federal ordinary income rate Short-term capital gains rate same as ordinary Federal short-term capital gains rate Federal long-term capital gains rate State income tax rate Apply simplified AMT surcharge estimate AMT rate (estimate)

Calculating…

v0.2.8 2026-10-03

v0.2.7 2026-09-27

v0.2.6 2026-09-27

v0.2.5 2026-09-27

v0.2.4 2026-09-27

v0.2.3 2026-09-27

v0.2.2 2026-09-27

v0.2.1 2026-09-27

App simulation