A content edit cannot silently change a paycheck

The calculation is maintained separately from the explanatory copy. A numerical change needs a current primary source and independently checked expected results.

Source priority

IRS, Social Security Administration, U.S. Department of Labor and responsible state or local authorities come before payroll-provider explanations.

How calculations are checked

We test ordinary amounts, zero values, invalid inputs, year-to-date wages and the points where wage limits begin or end. Unsupported combinations return unavailable, not an effective-rate guess.

Examples

Every example names tax year, frequency, filing status, deduction assumptions and excluded jurisdictions. No fake pay stub or customer outcome is used.

Corrections

A correction identifies the source, affected output, what changed and when the corrected calculation became available.