Roth 401(k) vs Traditional: Take-Home Pay Impact

Roth 401k vs traditional take-home pay differs by about $1,320 a year on a $100,000 salary with a 6% contribution, as a single filer in Texas in 2026. Traditional 401(k) contributions come out before federal income tax, so your paycheck shows less tax withheld. Roth contributions come out after tax, so your taxable wages stay higher and your net pay is slightly lower. Both options reduce take-home pay by the contribution amount.

Every paycheck is built from the same stack of deductions: gross pay, retirement contributions, federal income tax, Social Security, and Medicare. Choosing between a Roth and a traditional 401(k) changes only one piece of that stack, but that piece affects every check you receive. Use our net pay calculator for your salary to plug in your own number and see how your take-home pay shifts at different contribution rates. This guide walks through the math line by line, using a single example so you can reproduce each figure.

What Is the Difference Between Roth and Traditional 401(k)?

A traditional 401(k) is a pre-tax retirement account. Money you contribute is subtracted from your gross wages before federal income tax is calculated, which lowers your taxable income for the year. You pay income tax later, when you withdraw the money in retirement.

A Roth 401(k) is a post-tax retirement account. Contributions are taken from wages that have already been counted as taxable income, so you get no upfront income tax break. Qualified withdrawals in retirement, including earnings, are generally tax-free under the rules that apply to Roth accounts.

The two accounts share the same annual limit. According to IRS Notice 2025-67 (2025), the 2026 employee elective deferral limit is $24,500 for workers under 50. Workers 50 and older can contribute up to $32,500 in total for 2026, which includes the $8,000 catch-up contribution. Workers aged 60 to 63 have a catch-up of $11,250 under the same notice. Your combined Roth and traditional contributions cannot exceed the limit for your age group.

The key question for your paycheck is not which account grows faster. The question is when you pay income tax on the money: now, through lower withholding, or later, on withdrawal. That timing determines how much each check looks like.

Why the Tax Timing Matters for This Year's Paycheck

Taxes are withheld based on taxable wages, not gross pay. A traditional contribution reduces taxable wages, so federal withholding drops. A Roth contribution does not reduce taxable wages, so withholding stays at the level it would be without the 401(k).

This means a traditional contribution feels cheaper per dollar saved. On the same $6,000 contribution, the traditional route leaves more cash in your check this year than the Roth route. The difference is the federal income tax you avoid on the deferred dollars, which is the tax you would otherwise pay now.

How a Roth 401(k) Contribution Changes Your Paycheck

A Roth 401(k) contribution comes out of your paycheck after federal income tax is figured, but it comes out before you receive net pay. Your take-home pay falls by the full amount you contribute, and your taxable income is unchanged.

Take a single filer earning $100,000 in Texas with a 6% Roth contribution. Texas has no state wage income tax, so state tax is $0. The contribution is $6,000 per year, or $230.77 per biweekly check across 26 pay periods.

Start with the federal calculation. Standard deduction for single filers in 2026 is $16,100. Taxable income is $100,000 minus $16,100, or $83,900. Using the 2026 single brackets:

• 10% on the first $12,400: $1,240
• 12% on income from $12,400 to $50,400: $4,560
• 22% on income from $50,400 to $83,900 ($33,500): $7,370

Total federal income tax is $13,170. Because the Roth contribution does not reduce wages, the 22% bracket applies to $33,500 of taxable income, which is the portion above $50,400. The rate stays 22% on those dollars whether you contribute or not.

FICA is calculated on the full $100,000. Social Security is 6.2% of wages up to the $184,500 wage base, which is $6,200. Medicare is 1.45% with no cap, which is $1,450. FICA totals $7,650.

Annual take-home pay works out to $100,000 minus the $6,000 Roth contribution, $13,170 in federal income tax, and $7,650 in FICA. That leaves $73,180, or about $2,814.62 per biweekly check.

What a Roth Contribution Does Not Change

A Roth contribution does not lower federal taxable income, so it does not lower the income tax you pay this year. It also does not reduce Social Security or Medicare taxes. Your employer still withholds FICA on the full $100,000.

The benefit of a Roth contribution is tax-free growth and tax-free qualified withdrawals later. For workers who expect to be in a higher bracket in retirement, or who want flexibility about future tax rates, that trade can be worth the smaller paycheck.

How a Traditional 401(k) Contribution Changes Your Paycheck

A traditional 401(k) contribution is subtracted from gross pay before federal income tax is calculated. This reduces taxable wages, which reduces the income tax you pay in the same year. FICA is still withheld on the full wage amount.

Using the same $100,000 salary, single filer, Texas, and 6% contribution, the traditional calculation starts with $6,000 removed from wages. Taxable wages become $100,000 minus $6,000, or $94,000. Then the standard deduction of $16,100 applies, leaving taxable income of $77,900.

Federal income tax on $77,900 under the 2026 single brackets is:

• 10% on the first $12,400: $1,240
• 12% on income from $12,400 to $50,400: $4,560
• 22% on income from $50,400 to $77,900 ($27,500): $6,050

Total federal income tax is $11,850, which is $1,320 less than the Roth route. That difference is exactly 22% of the $6,000 deferred, because all of the contribution falls in the 22% bracket.

FICA is still $7,650, calculated on the full $100,000. Social Security is $6,200 and Medicare is $1,450, the same as in the Roth example.

Annual take-home pay is $100,000 minus the $6,000 traditional contribution, $11,850 in federal income tax, and $7,650 in FICA. That leaves $74,500, or about $2,865.38 per biweekly check.

Why the Traditional Route Looks Better Now

The traditional route gives you $1,320 more in annual take-home pay than the Roth route in this example. That gap is real for 2026. However, the traditional contribution will be taxed when you withdraw it in retirement, as ordinary income.

If your tax rate in retirement is similar to your current rate, the two approaches tend to end in similar after-tax positions. If your retirement rate is lower, the traditional route is often the stronger choice. If your retirement rate is higher, the Roth route may leave you with more spending power later. Your personal tax picture determines which side wins.

Withholding Changes Automatically

You do not need to file a new W-4 when you start or change a 401(k) contribution. Your payroll system reduces federal withholding based on your taxable wages, so a traditional contribution is reflected in each check automatically. The IRS publication used for withholding tables is Pub 15-T, and payroll software applies those tables after your contribution is removed.

Estimates for each check depend on your W-4 and your employer's payroll setup. The figures in this article assume one job, a current W-4, and withholding that matches the actual tax owed.

Side-by-Side: A $100,000 Salary at a 6% Contribution

The table below compares the two routes for the same worker: single filer, $100,000 salary, Texas, 6% contribution, 26 biweekly pay periods, and no other pre-tax deductions.

| Line Item | Traditional 401(k) | Roth 401(k) | |---|---|---| | Gross salary | $100,000 | $100,000 | | 401(k) contribution (6%) | $6,000 pre-tax | $6,000 after-tax | | Federal taxable income | $77,900 | $83,900 | | Federal income tax | $11,850 | $13,170 | | Social Security (6.2%) | $6,200 | $6,200 | | Medicare (1.45%) | $1,450 | $1,450 | | State income tax (Texas) | $0 | $0 | | Annual take-home pay | $74,500 | $73,180 | | Gross per biweekly check | $3,846.15 | $3,846.15 | | 401(k) per check | $230.77 | $230.77 | | Federal withholding per check (approx.) | $455.77 | $506.54 | | Take-home per biweekly check | $2,865.38 | $2,814.62 |

Read the table from top to bottom. Gross pay is the same. The contribution is the same dollar amount. The difference is federal taxable income, which drives the federal income tax line. Everything else is identical, so the entire $1,320 gap comes from federal income tax.

Per paycheck, the gap is about $50.77. For many workers, that is the number they notice first when comparing offer letters or enrollment screens.

Changing the Contribution Rate

The gap scales with the contribution. At 3%, the traditional advantage shrinks to about $660 a year, which is roughly $25 per biweekly check. At 10%, the traditional advantage grows to about $2,200 a year, or about $85 per check, assuming the same taxable income bands. Your take-home pay drops more with each percentage point you add, regardless of account type, because the contribution itself is always removed.

To test your own rate, enter your salary and 401(k) deduction in the calculator and compare the take-home figure against a second run with a different contribution rate. This shows the paycheck impact directly, without relying on the rough estimates in this article.

Using the Hourly Equivalent

If your salary is quoted hourly or you want to compare against a different wage, our hourly equivalent of a $100,000 salary page converts the figure to an hourly rate. The 401(k) math above does not change with the pay structure. The contribution still comes out of gross wages, whether you are paid by the hour or by the year.

Does Your Employer Match Go Pre-Tax or Roth?

Your employer match is a separate stream of money. It does not count against your personal contribution, and in most plans it does not count against your wages for income tax purposes either. Under typical plan design, employer matching contributions go into the pre-tax side of your account, even if your own contributions are Roth.

Matching contributions are not subject to FICA. Social Security and Medicare apply to your wages, not to the employer's match, so the match does not reduce your paycheck. It adds to your retirement balance without changing your take-home pay.

How Roth Match Options Work

Some plans now let employees elect Roth treatment for employer contributions. Under the rules that took effect after the SECURE 2.0 Act, a plan may allow the match to be designated as Roth. If you choose that option, the match is included in your taxable income for the year it is contributed, even though you never receive it as cash.

That means a Roth match can reduce your current take-home pay indirectly, through a higher federal income tax bill, even though the employer contributes the dollars. Not every plan offers this choice. Check your plan documents or your benefits portal to confirm whether Roth matching is available and whether it is the default.

Matches in Traditional Plans

In a traditional plan, the match goes into the pre-tax account and is taxed when you withdraw it. It does not show up as a wage line on your paystub, so your take-home pay is not affected. Your 401(k) statement will show the match separately from your own contributions, with a different vesting schedule in many plans.

Vesting matters because matched dollars may not be fully yours right away. If you leave before you are fully vested, you may forfeit part of the employer contribution. Vesting does not change the tax treatment of your own contributions.

Which Should You Choose? Questions to Ask First

The right choice depends on your current tax bracket, your expected tax bracket in retirement, and how much cash you need each month. Work through the questions below in order before you change your enrollment.

1. What is my current federal bracket? Single filers earning more than $50,400 of taxable income are in the 22% bracket. Those in the 22% bracket get the largest immediate tax break from a traditional contribution.
2. Do I need the extra take-home pay now? A traditional contribution lowers your check. If your budget is tight, the lower Roth paycheck may be harder to absorb, even if the long-term math favors Roth.
3. Do I expect a higher tax rate in retirement? Younger workers early in their careers often expect higher income later. A Roth contribution locks in today's tax rate on those dollars.
4. Does my plan offer Roth matching? If it does, decide how you want the employer match taxed before you elect it.
5. Can I split my contribution? Many plans let you split the elective deferral between Roth and traditional, as long as the combined total stays within the $24,500 limit for 2026. Splitting spreads tax risk across both types of accounts.

Using a Mix of Both

A split approach is common when you are uncertain about future tax rates. For example, a 6% contribution could be split into 3% traditional and 3% Roth. The traditional portion lowers this year's tax bill, while the Roth portion gives you tax-free dollars in retirement. Your take-home pay falls by the same total amount under any split, because both routes remove the full contribution from your check.

Changing your split is usually a simple enrollment update through your plan provider. Check whether your plan allows changes at any time or only during open enrollment, because the rules vary.

The Bottom Line

A traditional 401(k) leaves more money in your paycheck than a Roth 401(k) when your contribution rate is the same. On a $100,000 salary with a 6% contribution, the traditional route produces about $74,500 in annual take-home pay, compared with about $73,180 for the Roth route in 2026. That is a difference of $1,320 a year, or about $50.77 per biweekly check, for a single filer in Texas.

The gap comes entirely from federal income tax. Traditional contributions reduce taxable income, while Roth contributions do not. Neither type changes Social Security or Medicare withholding, and both use the same $24,500 elective deferral limit for workers under 50 in 2026, as set by IRS Notice 2025-67.

To see your own paycheck impact, plug your salary and contribution rate into our net pay calculator for your salary. For a deeper look at how each withholding line is computed, read our guide on how federal and state taxes are calculated on your paycheck. This is educational; talk to a tax pro for decisions that materially change your filing.

Frequently Asked Questions About Roth 401(k) and Take-Home Pay

Does a Roth 401(k) lower my paycheck?

Yes. A Roth 401(k) contribution is subtracted from your net pay by the full amount you contribute. On a $100,000 salary with a 6% contribution, that is $6,000 a year, or $230.77 per biweekly check. Your federal income tax does not drop because Roth contributions are taken from after-tax wages.

Is a Roth or traditional 401(k) better for take-home pay?

A traditional 401(k) gives you more take-home pay in the year you contribute. In the $100,000 example, the traditional route leaves about $74,500 a year versus $73,180 for Roth in 2026. The better choice for your long-term wealth depends on your future tax rate.

Does a Roth 401(k) contribution change my withholding?

It does not reduce federal withholding because Roth contributions do not lower taxable wages. Your payroll system withholds tax on the full wage amount. You do not need to file a new W-4 when you start or change a Roth contribution, as long as your existing W-4 still matches your situation.

Are employer 401(k) matches taxed differently with a Roth contribution?

Your match usually goes into the pre-tax side of the plan even when your own contributions are Roth. Some plans offer a Roth match option, which is taxed as income in the year it is contributed. Check your plan documents to see whether Roth matching is available in your plan.

What is the 2026 401(k) contribution limit for my paycheck?

According to IRS Notice 2025-67 (2025), the 2026 employee elective deferral limit is $24,500 for workers under 50. Workers 50 and older can contribute up to $32,500, including the $8,000 catch-up. Your paycheck deduction is limited by these totals across all of your Roth and traditional contributions combined.

Does a traditional 401(k) reduce Social Security and Medicare taxes?

No. Traditional 401(k) contributions reduce federal income tax but not FICA. Social Security is 6.2% of wages up to $184,500 in 2026, and Medicare is 1.45% with no cap. On a $100,000 salary, FICA is $7,650 whether you contribute to a traditional or a Roth account.

Can I split my 401(k) contributions between Roth and traditional?

Many plans allow you to split contributions between Roth and traditional options, as long as the combined amount stays within the annual limit. A split lets you balance this year's tax savings against future tax-free withdrawals. Check your plan's enrollment portal to see whether it offers both options.

How do I estimate my take-home pay with a 401(k) contribution?

Start with your gross pay per check, then subtract your 401(k) contribution, federal income tax, Social Security, and Medicare. For a traditional contribution, subtract the contribution before calculating federal tax. Our net pay calculator handles these steps for you, so you can compare contribution rates and see the change in each paycheck.