No account, no email, no card. Change a number and watch the result move.
This calculator posts to the same endpoint your return uses. Most sites run a separate simplified formula for the marketing page, which is why their calculator and their product disagree once you sign up.
The $15,750 standard deduction, the $2,200 child tax credit, the $40,000 SALT cap, and the new deductions for tips, overtime, seniors and car loan interest — with their phase-outs.
Flat-rate states and the largest progressive states compute exactly. The rest return a deliberately conservative figure using the state's top rate, clearly labelled, so the number is never a pleasant surprise in the wrong direction.
Everything you entered carries over — nothing to type twice.
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