The stakes are real. In the EBRI/Greenwald survey, 67% of workers said they feel confident about retirement, yet confidence doesn't pay the tax bill on a withdrawal.
The choice affects take-home pay, retirement income, and how much taxable income you'll have later. This guide covers the rules, when each option fits, and when splitting makes sense.
Key Takeaways
- Pre-tax contributions cut taxable income now and suit people expecting a lower retirement tax rate.
- Roth contributions use after-tax dollars and suit people expecting higher future income.
- Both types share one annual employee deferral limit.
- A split adds tax diversification, but it needn't be 50/50.
- Check your plan's match rules before changing elections.
Pre-Tax vs. Roth 401(k): Quick Comparison
| Feature | Pre-tax 401(k) | Roth 401(k) |
|---|---|---|
| Contribution | Before federal income tax | After income tax |
| Growth | Tax-deferred | Tax-free if qualified |
| Withdrawals | Taxed as ordinary income | Tax-free if qualified |
| Take-home pay | Smaller drop per dollar saved | Larger drop per dollar saved |
| Lifetime RMDs | Yes | None for the original owner |
Tax treatment of contributions and withdrawals
Pre-tax deferrals aren't included in gross income when contributed. The deferrals and their earnings are generally taxed as ordinary income when withdrawn.
Roth contributions are taxed up front. A Roth distribution is generally qualified only after a five-tax-year participation period and once you reach age 59½, become disabled, or die.
Qualified distributions, earnings included, are excluded from income.
Take-home pay
Contribute $500 per paycheck pre-tax and your net pay falls by less than $500, because your taxable wages shrink. The same $500 Roth contribution reduces take-home pay by the full amount. Payroll results vary, so run your plan's calculator.
Limits and employer match
For 2026, per IRS Notice 2025-67:
- Employee deferral limit: $24,500
- Age 50+ catch-up: $8,000
- Age 60–63 catch-up: $11,250
- Higher earners (prior-year FICA wages above $150,000 from the same employer) must make catch-up contributions as Roth
- Good-faith compliance applies before final Roth catch-up rules take full effect in 2027
Pre-tax and Roth deferrals count toward the same limit. Employer matches are not Roth by default. Unless your plan offers a Roth match election, the match generally lands in the pre-tax side. Read your plan document.
RMDs and rollovers
RMDs begin at age 73 for people born 1951–1959 and age 75 for those born in 1960 or later. A designated Roth 401(k) has no lifetime RMD for its original owner starting in 2024. Beneficiaries still face RMD rules.
On a job change, pre-tax money generally rolls to a traditional IRA and Roth 401(k) money to a Roth IRA. A Roth IRA has its own five-year test, so confirm the details with your plan administrator before moving funds.
What Are Pre-Tax and Roth 401(k) Contributions?
What is a pre-tax 401(k) contribution?
A pre-tax 401(k) contribution is a salary deferral taken from your paycheck before income tax. You get a smaller tax bill now and tax-deferred growth.
Pre-tax contributions are worth considering when:
- You're in peak earning years
- You need the deduction to keep your savings rate sustainable
- You expect a lower bracket in retirement
The trade-off: every dollar withdrawn is taxable. A portfolio made up entirely of pre-tax savings leaves you with less control over your taxable income in retirement.
What is a Roth 401(k) contribution?
A Roth 401(k) is a designated account within an employer plan funded with after-tax dollars. Qualified withdrawals don't add to your taxable income.
Roth contributions often appeal when:
- You're early in your career or expect higher earnings later
- You want tax-free income available in retirement
The trade-offs: no current deduction, lower take-home pay, and a five-year holding period before withdrawals are fully qualified.
What do they have in common?
- Both sit inside the same employer plan and use its investment menu
- Both grow with tax-advantaged compounding
- Both may qualify for employer matching under plan rules
A Roth 401(k) is not a Roth IRA. For 2026, Roth IRA contributions are capped at $7,500 and phase out at modified AGI of $153,000–$168,000 for single filers and $242,000–$252,000 for joint filers. According to the IRS designated Roth topic, those income limits don't apply to Roth 401(k) contributions.
Pre-Tax vs. Roth 401(k): What Is Better for You?
Start with one comparison: your marginal tax rate now versus the rate you expect on retirement income. Nobody knows future tax law, so treat this as an educated estimate.
Lean pre-tax when
- Your current taxable income is unusually high
- You expect lower taxable income in retirement
- The deduction is what lets you save more
Lean Roth when
- You're in a lower bracket today
- Your earnings are likely to rise
- You expect substantial taxable income in retirement, from pensions or other accounts
- You want tax-free flexibility later
Consider a combination when
- Future tax rates are uncertain
- You'll have several income sources in retirement
- You want both taxable and tax-free buckets to draw from
Under current law, the 2017 rate cuts are permanent, so brackets for 2026 run from 10% to 37%. A single filer pays 22% on taxable income between $50,400 and $105,700 and 24% up to $201,775.
Decision checklist
- Age and years until retirement
- Filing status and current and projected income
- Deductions and state income tax
- Employer match requirements
- Expected retirement spending
- Existing pre-tax and Roth balances
- Likely rollover or withdrawal plans
Salary cutoffs and the match
There is no universal salary at which a Roth 401(k) stops making sense. High earners can use one because Roth 401(k) eligibility isn't tied to income, though the plan must offer it.
First capture your full employer match. Then choose the contribution type and raise your overall savings rate. The tax choice never substitutes for saving enough.
Real-World Examples and Planning Scenarios
These are simplified illustrations, not forecasts or client results.
Scenario 1: Pre-tax fits.
A married couple filing jointly earns well into the 24% bracket (taxable income of $211,400–$403,550) and expects a modest pension and lower spending in retirement. Pre-tax deferrals reduce their taxable income now, and withdrawals may later be taxed at a lower rate.
The limit: if retirement income turns out higher than expected, the advantage shrinks.
Scenario 2: Roth or a blend fits.
A single 28-year-old sits in the 12% bracket (taxable income of $12,400–$50,400) and expects steady raises. Paying tax at 12% now looks attractive, so Roth contributions make sense, perhaps with pre-tax dollars added as income rises. The cost is a smaller paycheck today.
Vanguard's hypothetical assumes $3,600 a year, 6% growth, 30 years, and a flat 15% rate. Both accounts reach $284,609, and the tax bill is similar either way. What matters most is the tax rate you pay now versus later.
If you're approaching retirement, changing jobs, or weighing a 401(k) rollover, Lewis & Associates Capital Advisors, LLC can help coordinate contribution decisions with a personalized retirement-income and investment plan.
Its Holly Springs and Raleigh, North Carolina offices handle 401(k) planning, and you can reach the firm at 984-225-4044. Direct tax-specific questions to a qualified tax professional.
Conclusion
Neither option wins universally. Pre-tax contributions emphasize tax savings today, Roth contributions emphasize tax savings later, and a mix can hedge against uncertainty.
Revisit your elections when income, tax law, family circumstances, retirement timing, or your employer's plan changes. This article is educational and isn't individualized tax advice.
Frequently Asked Questions
Is it better to do pre-tax or Roth 401(k)?
It depends on your current versus expected retirement tax rate, cash-flow needs, and income goals. Many investors use both.
Should I split my 401(k) between Roth and traditional?
A split builds tax diversification. Combined deferrals share one annual limit, and the ratio should fit your situation rather than default to 50/50.
At what salary should you not use a Roth 401(k)?
No universal threshold exists. Marginal rate, deductions, future income, and expected withdrawals matter more, and Roth IRA income limits don't apply to Roth 401(k)s.
Can I contribute to a Roth if I make $200,000?
Roth 401(k) contributions have no income cap, provided your employer's plan offers the option. Roth IRA limits are different, so check current IRS rules.
What are pre-tax and Roth combined contributions?
If your plan permits, you can split deferrals between both types. Together they count toward one annual limit ($24,500 for 2026).
What is a Roth 401(k)?
It's an employer-plan account funded with after-tax contributions. Qualified withdrawals, including earnings, are tax-free after five tax years and age 59½, disability, or death.
