Pre-tax deductions are amounts taken from your paycheck before income taxes are calculated. They reduce your taxable wages, which lowers both your federal and state income tax — sometimes by hundreds of dollars per month.
2026 Pre-Tax Deduction Limits
| Deduction Type | 2026 Limit | Reduces Federal Tax | Reduces FICA |
|---|---|---|---|
| 401(k) / 403(b) employee contributions | $23,500 | ✓ Yes | ✗ No |
| 401(k) catch-up (age 50+) | +$7,500 | ✓ Yes | ✗ No |
| HSA (self-only coverage) | $4,300 | ✓ Yes | ✓ Yes |
| HSA (family coverage) | $8,550 | ✓ Yes | ✓ Yes |
| FSA (health care) | $3,300 | ✓ Yes | ✓ Yes |
| Dependent Care FSA | $5,000 | ✓ Yes | ✓ Yes |
| Employer health insurance premiums (employee share) | No limit | ✓ Yes | ✓ Yes |
How Much Do Pre-Tax Deductions Actually Save?
The tax savings depend on your marginal rate. At a $75,000 salary (22% federal bracket) in a 5% state tax state:
| Deduction | Annual Amount | Fed Tax Saved | State Tax Saved | FICA Saved | Total Saved |
|---|---|---|---|---|---|
| Max 401(k) | $23,500 | $5,170 | $1,175 | $0 | $6,345 |
| HSA (self-only) | $4,300 | $946 | $215 | $329 | $1,490 |
| Health insurance ($500/mo employee share) | $6,000 | $1,320 | $300 | $459 | $2,079 |
Pre-Tax vs Post-Tax: Key Difference
Pre-tax deductions (traditional 401k, HSA, FSA, health insurance): reduce current taxable income, but you pay taxes when you withdraw (for 401k) or the money is earmarked (FSA/HSA).
Post-tax deductions (Roth 401k, Roth IRA contributions, union dues, garnishments): taken after taxes — no immediate tax savings, but Roth withdrawals in retirement are tax-free.
Does 401k Reduce FICA?
No. Traditional 401(k) contributions reduce your federal and state taxable income but do not reduce FICA (Social Security or Medicare). HSA and FSA contributions do reduce FICA when made through payroll (employer plan) — that's a meaningful additional savings often overlooked.