Based on an estimated 8.7M undocumented, or illegal, immigrants per year from 2021-2026, a US Congressional Budget Office (CBO) report says the country will see an increase of $1.7T in federal revenue from 2024-2034 and a decrease in federal spending of $897B.
This figure is based on projections that through their participation in the labor market, they will pay $788B in taxes and add $387B in federal revnue through their overal effect on the economy.