8 Things to Know Before Choosing Roth vs. Traditional 401(k)
The Roth-versus-traditional 401(k) choice is mainly about when you pay income tax. Traditional elective deferrals generally reduce current taxable income; designated Roth contributions are included in current gross income.
Quick Answer
- Traditional generally gives the federal income-tax benefit now; Roth generally pays income tax now for potential qualified tax-free distributions later.
- The 2026 employee elective-deferral limit is $24,500 across traditional and Roth 401(k) contributions combined.
- Roth-IRA income limits do not apply to designated Roth 401(k) contributions.
- You can generally split contributions between Roth and traditional if the plan permits.
- In 2026, certain higher-paid catch-up-eligible participants must make catch-up contributions on a Roth basis.
1. This Is Mostly Tax Now Versus Tax Later
Traditional elective deferrals are generally pre-tax for federal income-tax purposes, while designated Roth contributions are included in current gross income. Your current and expected future tax situation matters more than slogans about which account is “better.”
2. Roth Can Reduce Take-Home Pay More
At the same contribution amount, switching from traditional to Roth generally leaves more wages subject to current federal income tax. Check the effect on an actual paycheck.
Compare the after-tax budget, not just the contribution percentage.
3. Roth and Traditional Share the Employee Limit
For 2026, the employee elective-deferral limit is $24,500 across traditional and Roth combined.
The general age-50+ catch-up limit is $8,000 in 2026; ages 60—63 have a higher $11,250 catch-up limit.
Using both contribution types does not create two separate $24,500 employee limits.
4. Roth 401(k) Has No Roth-IRA-Style Income Ceiling
The IRS says Roth IRA income restrictions do not apply to designated Roth workplace contributions. High income can block a direct Roth IRA contribution without blocking Roth 401(k) deferrals in a plan that offers them.
5. Employer Match Treatment Depends on the Plan
A Roth deferral can still count toward a match. SECURE 2.0 permits certain vested matching and nonelective contributions to be designated Roth if a plan offers that feature, so do not assume every employer dollar follows your employee election.
6. The 2026 Roth Catch-Up Rule Matters
Beginning in 2026, participants in plans with Roth features offering catch-up contributions must make catch-up contributions on a Roth basis if prior-year wages from that plan sponsor exceeded $150,000 for 2026 purposes.
This rule concerns catch-up contributions, not all regular 401(k) deferrals. Confirm how your plan and payroll implement it.
7. You Can Split the Difference
If the plan permits, you can generally direct some elective deferrals to traditional and some to Roth, subject to the combined limit. Revisit the mix after major income, filing-status or retirement-plan changes.
8. Compare Withdrawal Treatment Too
The contribution tax treatment is only half the decision. Traditional and Roth money have different tax consequences at withdrawal. Also, a designated Roth 401(k) and a Roth IRA are different account types with different eligibility and operational rules.
Before You Choose Roth vs. Traditional 401(k) Checklist
- Confirm the plan offers Roth.
- Estimate current federal and state marginal rates.
- Check the paycheck effect.
- Confirm employer match treatment.
- Remember the $24,500 combined 2026 employee limit.
- Check catch-up eligibility and the 2026 Roth catch-up rule.
- Consider whether a split fits your situation.
FAQ
Can I contribute to both?
Generally yes if the plan permits, subject to the combined employee deferral limit.
Is there an income limit for Roth 401(k)?
The Roth IRA contribution income restrictions do not apply to designated Roth 401(k) contributions.
What is the 2026 employee contribution limit?
$24,500 for regular employee elective deferrals, with separate catch-up rules.
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The Bottom Line
There is no universal Roth-or-traditional winner. Compare current tax savings with future Roth treatment, account for paycheck impact and check your plan’s actual rules.