Quick Answer
Traditional 401(k) contributions appear above the taxable wages line and reduce your tax liability immediately. Roth 401(k) contributions appear below taxes as post-tax deductions, so you pay full taxes on your gross income. On a $75,000 salary, a $200 traditional contribution saves about $60 in taxes per paycheck versus $0 for Roth.
Best Answer
Sarah Chen, Payroll Tax Analyst
Workers who want to understand exactly how different retirement contributions show up on their pay stub
Pay stub anatomy: Where each 401(k) type appears
Your pay stub processes deductions in a specific order mandated by federal payroll regulations. Understanding this sequence explains why traditional and Roth 401(k) contributions have different impacts.
Traditional 401(k) on your pay stub
Appears in the "Pre-Tax Deductions" section:
Roth 401(k) on your pay stub
Appears in the "Post-Tax Deductions" section:
Side-by-side pay stub comparison
Let's compare two identical employees earning $75,000 annually ($2,885 biweekly), both contributing $200 per paycheck:
Key differences to notice
How this affects your tax return
According to IRS Publication 525, traditional 401(k) contributions reduce your taxable income for the year, potentially lowering your tax bracket or qualifying you for credits with income limits. Roth contributions have no impact on your current-year taxes but won't count as taxable income when withdrawn in retirement.
What you should do
1. Check your pay stub carefully: Look for your 401(k) contribution in the correct section to verify it's being processed as intended
2. Understand the tax impact: Use our calculator to see exactly how each option affects your take-home pay
3. Plan for year-end: Remember that traditional contributions will reduce your W-2 Box 1 income, while Roth won't
Key takeaway: Traditional 401(k) appears before taxes and reduces your taxable wages by the contribution amount, while Roth 401(k) appears after taxes and doesn't reduce any taxable income on your pay stub.
*Sources: [IRS Publication 525](https://www.irs.gov/pub/irs-pdf/p525.pdf), [IRS Publication 560](https://www.irs.gov/pub/irs-pdf/p560.pdf)*
Key Takeaway: Traditional 401(k) reduces taxable wages on your pay stub and provides immediate tax savings, while Roth 401(k) appears as a post-tax deduction with no current tax benefit.
Side-by-side comparison of how traditional vs Roth 401(k) appears on pay stub
| Pay Stub Line Item | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Gross Pay | $2,885.00 | $2,885.00 |
| Pre-Tax 401(k) | $200.00 | $0.00 |
| Taxable Wages | $2,600.00 | $2,800.00 |
| Total Taxes | $718.90 | $774.20 |
| Post-Tax 401(k) | $0.00 | $200.00 |
| Net Pay | $1,881.10 | $1,825.80 |
More Perspectives
Sarah Chen, Payroll Tax Analyst
New workers seeing their first pay stub and trying to understand the deduction categories
Reading your first pay stub with 401(k) contributions
Your pay stub might seem confusing, but it follows a logical order. Think of it like a recipe — ingredients are added in a specific sequence to get the right result.
The pay stub "recipe" with traditional 401(k):
1. Start with gross pay
2. Subtract pre-tax stuff (traditional 401k, health insurance)
3. Calculate taxes on what's left
4. Subtract taxes
5. Subtract after-tax stuff (nothing for traditional 401k)
6. What's left is your take-home pay
With Roth 401(k), step 5 changes:
1-4 are the same, but:
5. Subtract after-tax stuff (your Roth 401k contribution)
6. What's left is your take-home pay
Why this matters for your first job
Many entry-level workers choose Roth 401(k) because they're in lower tax brackets now. On your pay stub, you'll see:
This means your paycheck is smaller with Roth, but you're building tax-free retirement wealth.
Key takeaway: Your pay stub shows the order of deductions — traditional 401(k) reduces taxes immediately, while Roth comes after taxes are calculated and paid.
Key Takeaway: Pay stubs process deductions in order — traditional 401(k) reduces your taxes, while Roth comes after taxes are already calculated and paid.
Sarah Chen, Payroll Tax Analyst
Workers with wage garnishments who need to understand how different 401(k) types affect court-ordered payments
How 401(k) type affects your garnishment calculation
If you have wage garnishments, the type of 401(k) you choose directly impacts how much money is subject to court orders. This shows up clearly on your pay stub.
Pay stub with traditional 401(k) and garnishment:
Same person with Roth 401(k):
The bottom line impact
With traditional 401(k): Net pay of $1,080
With Roth 401(k): Net pay of $1,000
Difference: $80 less per paycheck with Roth — that's $30 more in garnishments plus $50 more in taxes.
Key takeaway: Traditional 401(k) reduces your garnishable income, while Roth 401(k) doesn't, potentially increasing court-ordered payments by hundreds of dollars per year.
Key Takeaway: Traditional 401(k) reduces garnishable income on your pay stub, while Roth doesn't, potentially increasing court-ordered payments significantly.
Sources
- IRS Publication 525 — Taxable and Nontaxable Income
- IRS Publication 560 — Retirement Plans for Small Business
Related Questions
Reviewed by Sarah Chen, Payroll Tax Analyst on February 28, 2026
This content is for educational purposes only and is not a substitute for professional tax advice. Consult a qualified tax professional for advice specific to your situation.