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Tools & calculators
Combined federal tax estimator
Set your income and see the whole federal picture in one place: income tax, the AMT check, long-term capital gains, and the payroll and investment surtaxes. Built for people whose pay includes equity, where a big vest or exercise can touch all of them at once.
Standard deduction applied: $16,100 (2026, single).
Add other income and deductions
What it covers
Federal income tax with a parallel alternative minimum tax check (you pay the higher one), long-term capital gains stacked on top of your ordinary income, Social Security, Medicare and the Additional Medicare Tax, and the net investment income tax. It runs 2024 through 2026 for all four filing statuses.
What it leaves out
State and local tax, self-employment tax, and the big one for option holders, the ISO-exercise AMT adjustment. If you are exercising and holding incentive stock options, that adjustment can change the AMT result a lot, and it has its own deep dive in the AMT trap.
A note on accuracy
The tax logic and brackets are adapted from the open-source Combined Income Tax Estimator and checked against it to the dollar. It is an estimate, meant to get you close, not a return you can file. For the number that actually goes on your taxes, especially with options or a concentrated position, have a real conversation.