Payroll Deduction
What is a payroll deduction and what types are there?
A payroll deduction is any amount withheld from an employee's gross pay before or after taxes. Pre-tax deductions include 401(k) contributions, HSA contributions, health insurance premiums, and transit/parking benefits. Post-tax deductions include Roth 401(k), wage garnishments, union dues, and voluntary benefits like life insurance. Mandatory deductions include federal and state income tax, FICA, and court-ordered garnishments. Employers must honor specific priorities when multiple deductions compete against a paycheck.
Payroll deductions are where payroll gets complicated. A clean deduction stack includes pre-tax benefits, tax withholding, post-tax benefits, and sometimes garnishments, all calculated in the correct order against a paycheck that might not fully cover them. The rules on ordering, caps, and consent are a mix of federal tax code, state wage-and-hour law, plan document requirements, and court order priorities.
Pre-Tax vs. Post-Tax Deductions
Pre-tax: reduce taxable wages for federal income tax, FICA (except 401k/403b which reduce income tax only), and most state income tax. Common: 401(k) traditional, HSA, FSA, group health premiums, transit/parking. Post-tax: deducted after taxes. Common: Roth 401(k), wage garnishments, union dues, voluntary life insurance.
Mandatory vs. Voluntary Deductions
Mandatory: federal income tax, state income tax, FICA, court-ordered garnishments (child support, tax levy, creditor judgment), union dues in union shops. Voluntary: benefits enrollments, retirement contributions, charitable giving, loan repayments. Voluntary deductions require written employee authorization in most states.
Deduction Priority When Pay Is Insufficient
When gross pay can't cover all deductions, priority rules apply. Mandatory tax withholding and court-ordered garnishments come first, then benefits required for coverage, then voluntary. Each state has specific rules.
Running a Clean Payroll Deduction Setup
Review each employee's deduction setup at hire and at every benefits change. Audit deduction totals against W-2 year-end figures. Watch for over-deduction at annual benefit limits. Communicate deduction changes in writing before they hit the paycheck. See compensation and FICA.
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