Should you use a Roth or Traditional 401(k)? Compare tax savings now vs later based on your income and expected retirement tax bracket. Free calculator included.
📊 The Short Answer
Traditional 401(k) wins if your current tax rate (22-24%) is higher than your expected retirement rate (12-15%). Roth wins if you're early in your career with a low current rate (12%) and expect higher income later. At $100,000 income (24% bracket), Traditional saves $5,640/year in taxes now and you pay ~12% in retirement — a 12% net tax advantage. The breakeven is roughly the 22-24% bracket threshold.
Traditional 401(k) Tax Savings ($100k, 24% bracket)
Contributing $23,500 reduces taxable income. Tax deferred until withdrawal at likely lower rate.
Roth 401(k): Tax-Free at Retirement
You pay 24% tax now, but ALL growth and withdrawals are tax-free. Best if you expect higher taxes in retirement.
30-Year Difference (Traditional wins at 24%→12%)
Traditional: invest tax savings + contributions. Roth: invest after-tax. Traditional builds ~$310k more wealth when retirement rate is lower.
If Tax Rates Are Equal (24% now = 24% later)
Roth and Traditional produce the same after-tax wealth when tax rates are equal. The choice depends on whether you think rates will rise.
| Current Income | Current Bracket | Expected Retirement Bracket | Winner |
|---|---|---|---|
| $50,000 | 12% | 12-15% | Roth (pay low tax now) |
| $75,000 | 22% | 12-15% | Traditional (defer at 22%, pay 12%) |
| $100,000 | 24% | 12-15% | Traditional (defer at 24%, pay 12%) |
| $150,000 | 24% | 24% | Toss-up (equal rates) |
| $200,000 | 32% | 24% | Traditional (defer at 32%, pay 24%) |
Compare two scenarios: (1) Traditional: contribute $23,500 pre-tax, invest the $5,640 tax savings in a taxable account at 7% (with dividend tax drag). (2) Roth: pay $5,640 in tax, contribute $17,860 after-tax. Both grow at 7% for 30 years. Traditional: pay 12% tax on withdrawals. Roth: withdrawals tax-free. Compare after-tax wealth.
Outcome: Contribute $11,750 to Traditional, $11,750 to Roth. You get some tax savings now AND tax-free income in retirement. Best if you're uncertain about future tax rates.
Pros
Cons
Outcome: Max Traditional 401(k) ($23,500) + max Roth IRA ($7,000 backdoor if needed). This gives you pre-tax growth + tax-free growth. Total: $30,500/year in tax-advantaged accounts.
Pros
Cons
💡 What This Means For You
For most middle-to-high income earners contributing to a 401(k), Traditional is the mathematically superior choice because most people are in a lower tax bracket in retirement. However, Roth provides valuable tax diversification and flexibility. The 'correct' answer for most people: max Traditional 401(k) first, then contribute to a Roth IRA for tax diversity. If you're in the 12% bracket now, go all Roth — you're paying taxes at the lowest rate you'll likely ever see.
Yes, if your employer offers both. The combined limit is $23,500 (2026). You can split it any way you want — 50/50, 70/30, etc. The limit applies to total contributions across both types.
You can roll it into a Roth IRA, where it continues growing tax-free and has NO RMDs. You can also leave it in the old employer's plan, but Roth 401(k)s still have RMDs at 73 unlike Roth IRAs. Rolling to a Roth IRA is usually the best move.
No. Unlike Roth IRAs ($146k single limit in 2026), Roth 401(k)s have no income limits. High earners can contribute the full $23,500 to a Roth 401(k) regardless of income. This is one of the biggest advantages of Roth 401(k)s for high-income professionals.
Traditional 401(k) withdrawals before 59½ incur a 10% penalty plus income tax. Roth 401(k) contributions can be accessed penalty-free after rolling to a Roth IRA (subject to 5-year rule). For early retirees, having some Roth money provides more flexibility before 59½.
Important Disclaimer — Not Financial Advice
The results from this calculator are for informational and educational purposes only. They are not a guarantee of actual outcomes and should not be considered financial, investment, tax, or legal advice. Always consult a qualified professional for advice tailored to your specific financial situation. See our Terms of Service and Privacy Policy for more information.
Last reviewed by Qasem Mohammed — May 31, 2026
AI & Software Engineer, Founder & Lead Developer at QFINHUB · Editorial Policy