Spaife
One running tax estimate across everything you earn
What it does
Tax calculators are one-shot: enter numbers, get a guess, forget it. Spaife keeps one running federal estimate that updates as you earn — W-2 paychecks, stock and crypto trades, side gigs, betting — one number you can watch move. Event-sourced under the hood, so every estimate traces back to the exact income events behind it. Early access; estimates, not tax advice.
Spaife keeps one running federal tax estimate across all your income — W-2, stock and crypto trading, side gigs, and betting — updated as you earn. Early access; estimates, not tax advice.
Does the same job
all alternatives →- CFCalculator for US individual income tax, from 1970-present2022 · ▲497
I wanted to share a simple web app I created recently, which lets you estimate income taxes owed in the US: https://taxsim.app All the calculations occur directly in the browser, and are powered by a Fortran program that has been converted to WASM using emscripten. This calculator was originally developed in the 1970s [1] by the non-profit National Bureau of Economic Research. NBER has been maintaining this F77 codebase for the last 50 years, and uses it primarily for academic research on tax policy. The Fortran source code itself is over 1MB of text, because it codifies both…
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