A traditional 401(k) gives you a tax deduction now and taxes withdrawals in retirement; a Roth 401(k) gives no break now but lets you withdraw completely tax-free later. Both have the same contribution limit (about $24,500 in 2026) — the choice comes down to whether your tax rate will be higher now or in retirement.
Quick verdict
Choose Roth 401(k) if you're early-career or expect higher taxes later — lock in today's lower rate and grow tax-free. Choose traditional 401(k) if you're a high earner now expecting a lower bracket in retirement, and want the deduction today. Splitting between both is a sensible hedge if you're unsure.
Traditional vs Roth 401(k) at a glance
| Feature | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Contributions | ✅ Pre-tax (deduction now) | After-tax (no break now) |
| Withdrawals in retirement | Taxed as income | ✅ Tax-free if qualified |
| 2026 contribution limit | ~$24,500 | ~$24,500 (shared) |
| Lowers taxable income now | ✅ Yes | ❌ No |
| Required Minimum Distributions | Yes, from age 73 | ✅ None (since 2024) |
| Best if your tax rate is… | Higher now | Higher later |
2026 limit is approximate pending final IRS figures.
The one question that decides it
Will your tax rate be higher today or when you retire? If higher today (you're a peak earner), the traditional 401(k)'s up-front deduction is worth more, and you'll likely withdraw at a lower rate later. If higher later (you're young, early-career, or expect rising income and tax rates), the Roth wins — you pay tax at today's lower rate and never pay on the growth. Since nobody knows future tax law for certain, many savers split contributions to diversify their tax exposure.
Don't forget the match
Whichever you choose, contribute enough to capture the full employer match first — it's free money. Note that the match itself usually lands in a pre-tax (traditional) bucket even if your own contributions are Roth, so a "Roth" saver often ends up with both. Learn more in how 401(k) matching works and 401(k) vs IRA.
Related calculators & guides
- 401(k) Calculator — project your balance and match.
- Roth IRA Calculator — tax-free growth modelled.
- Roth IRA vs 401(k).
- Roth vs Traditional IRA.
Frequently asked questions
Should I choose a traditional or Roth 401(k)?
Roth if you expect higher taxes in retirement (often younger/lower earners); traditional if you expect a lower rate later and want the deduction now. Splitting between both hedges the uncertainty.
What is the difference between a traditional and Roth 401(k)?
Traditional is pre-tax now and taxed later; Roth is after-tax now and tax-free later. Both share the same ~$24,500 limit in 2026.
Is the employer match pre-tax in a Roth 401(k)?
Usually yes — the match typically goes into a pre-tax account even with Roth contributions, though some plans now offer a Roth match. Check your plan.
Does a Roth 401(k) have required minimum distributions?
No — since 2024, Roth 401(k)s no longer require lifetime distributions, matching Roth IRAs. Traditional 401(k)s still require them from age 73.