Calculator for US individual income tax, from 1970-present
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…
Calculator for US individual income tax, from 1970-present launched on June 29, 2022 with 497 votes, #12 of 3,005 launches that month and more than 99% of that year's launches.
In plain words
This web app estimates US individual income taxes from 1970 to the present day. It runs calculations directly in the browser using a Fortran program converted to WebAssembly, originally developed in the 1970s by the National Bureau of Economic Research for academic tax policy research. The calculator encodes federal and all 50 states' tax laws across 62 years, making it suitable for anyone needing historical or current tax estimates.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
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…
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