Tax debates usually argue about rates, but the result that matters is revenue: how much a set of rules would raise, and from whom. This simulator lets you change the individual income tax brackets, the child tax credit, tariffs and excise taxes, then shows estimated federal revenue and who pays by income group.
The model is built from one year of IRS Statistics of Income, Treasury and Census tables, is checked against official totals, and runs entirely in the browser. It is a simplified teaching tool, not an official forecast, and its How it works and Sources pages document every assumption and data file.