Health insurance is usually the biggest benefit deduction on your pay stub. Here's how pre-tax deductions work and why they save you money.
By ExpertPaystubs Editorial Team. Published 2026-03-12
If you have employer-sponsored health insurance, you'll see a deduction on every pay stub for your share of the premium. What many workers don't realize is that this deduction is typically pre-tax — meaning it saves you money on both federal AND state taxes.
How Pre-Tax Health Insurance Works
Under IRS Section 125 (Cafeteria Plans), your health insurance premiums are deducted BEFORE taxes are calculated:
Gross Pay: $3,000.00
Health Insurance: -$250.00 ← Deducted FIRST
Taxable Income: $2,750.00 ← Taxes calculated on this
Federal Tax (22%): -$370.00 ← Lower because of pre-tax deduction
State Tax (5%): -$137.50
SS (6.2%): -$186.00 ← NOTE: Also reduced by pre-tax deduction
Medicare (1.45%): -$43.50
Net Pay: $1,763.00
Without pre-tax treatment, your health insurance would come out AFTER taxes, costing you more:
Annual Tax Savings from Pre-Tax Health Insurance
| Annual Premium | Federal Savings (22%) | State Savings (5%) | FICA Savings (7.65%) | Total Saved |
|---|---|---|---|---|
| $3,000 | $660 | $150 | $230 | $1,040 |
| $6,000 | $1,320 | $300 | $459 | $2,079 |
| $9,000 | $1,980 | $450 | $689 | $3,119 |
| $12,000 | $2,640 | $600 | $918 | $4,158 |
Types of Health Insurance Deductions
| Deduction | Typical Code | Pre/Post Tax | Monthly Range |
|---|---|---|---|
| Medical (employee only) | MED/HLTH | Pre-tax | $100-$300 |
| Medical (employee + spouse) | MED+SP | Pre-tax | $300-$700 |
| Medical (family) | MED FAM | Pre-tax | $500-$1,200 |
| Dental | DNTL | Pre-tax | $15-$50 |
| Vision | VIS | Pre-tax | $5-$15 |
| HSA | HSA | Pre-tax | Up to $358/mo individual |
| FSA | FSA | Pre-tax | Up to $275/mo |
Employer vs Employee Contributions
Most employers cover 70-85% of insurance premiums. Your stub only shows the employee portion:
- Total monthly premium: $800 (example)
- Employer pays: $600 (75%)
- Employee pays: $200 (25%) ← This is what appears on your stub
The employer contribution may appear on your annual Form W-2 in Box 12, Code DD.
What to Check on Your Pay Stub
- Correct plan type: Verify you're enrolled in the plan you chose
- Pre-tax vs post-tax: Confirm it reduces taxable income
- Amount matches enrollment: Compare to your benefits confirmation
- Mid-year changes: After qualifying life events (marriage, baby, job change), ensure deductions updated
When Health Insurance Is Post-Tax
Some situations where premiums are NOT pre-tax:
- Individual/marketplace plans — Paid with after-tax dollars (but may qualify for premium tax credit)
- COBRA continuation — Typically post-tax unless employer offers Section 125
- Plans not under Section 125 — Some small employers don't offer cafeteria plans
- 2% S-Corp shareholders — Must include premiums in W-2 gross wages