What it is
The Social Security payroll tax, 6.2 percent of your taxable basic pay up to the annual wage base. Allowances like BAH and BAS are exempt.
2026 rate
6.2 percent of taxable wages.
What goes wrong
This one is pure math: taxable wages times 6.2 percent. If the line does not equal that math, something upstream is wrong with your recorded taxable wages.