ARBITROZ

How this is calculated. Your federal income tax is computed using the actual 2025 IRS tax brackets and standard deduction for your filing status (no credits, itemized deductions, or other adjustments are applied — this is a simplified estimate, not a tax filing). That tax total is then spread across federal spending categories in the same proportions as real fiscal year 2025 federal outlays.

Two layers of detail. The top-level rows (Social Security, Medicare, Medicaid, defense, and so on) come straight from the Congressional Budget Office's fiscal year 2025 actual-outlay tally and sum exactly to the year's $7.01 trillion in total spending. Rows marked APPROX break a category down further using a second, independent source or a modeled split — those sub-amounts are good-faith estimates, not one-to-one audited figures, and are labeled as such everywhere they appear.

Caveats worth knowing. This allocates your income tax as if it funded every category of federal spending proportionally. In reality, payroll taxes (not counted here) specifically fund Social Security and Medicare, and a large share of federal spending is financed by borrowing rather than current-year taxes — FY2025 ran a $1.775 trillion deficit on $7.01 trillion in outlays against $5.235 trillion in receipts. The "lifetime" mode assumes your income and today's tax law held constant across all the years entered; it is a rough estimate, not a historical reconstruction.