Pre-Tax vs. Post-Tax Deductions Explained
Your pay stub has a list of deductions, but not all deductions work the same way. Some come out before taxes are calculated, and some come out after — and that timing has a real effect on both your paycheck and your tax bill. Here's the difference, in plain English. Pre-tax deductions A pre-tax deduction is subtracted from your gross pay before federal (and most state) income tax is calculated. That means the deduction lowers your taxable income — you pay less in income tax, in addition to whatever the deduction itself costs you. Common pre-tax deductions include: Traditional 401(k) or 403(b) contributions Health, dental, and vision insurance premiums (through an employer plan) Health Savings Account (HSA) contributions Flexible Spending Account (FSA) contributions Commuter benefits (transit/parking, up to IRS limits) Important: Pre-tax deductions typically still count toward Social Security and Medicare (FICA) taxes — only 401(k) contributions are an exception...