Roth IRA vs Traditional IRA — Which Wins for You?

The single most important question for US retirement savers: Roth or Traditional IRA? The answer depends entirely on whether you expect to be in a higher or lower tax bracket in retirement than you are today. This calculator runs both with your specific tax assumptions and shows the after-tax winner.

Calculator → Comparison

Traditional IRAvsRoth IRA

Pay tax now or pay tax later? The right answer depends on your tax bracket today vs in retirement.

Years30
Return9.00%

Traditional IRA Option A

Contributions are pre-tax (deduct from income today). All withdrawals taxed at retirement-age rates.

Traditional IRA

Pre-Tax Maturity–
Tax Saved Now (cumulative)–
Tax Owed at Withdrawal–
Net After-Tax–

Roth IRA Option B

Contributions are post-tax (no deduction today). All growth and withdrawals are 100% tax-free in retirement.

Roth IRA

Maturity (Tax-Free)–
Total Contributed (Post-Tax)–
Tax Now (effective up-front cost)–
Net After-Tax–

The Verdict

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The Decision Rule (in 30 seconds)

  • You’re in a low bracket NOW (12-22%) and expect MORE income in retirement? → Roth wins. Lock in today’s low rate.
  • You’re in a high bracket NOW (32-37%) and expect MUCH LESS income in retirement? → Traditional wins. Defer to lower future rates.
  • You’re uncertain about future tax rates? → Roth has the edge. Tax-free is tax-free regardless of what happens.
  • You’re early-career, high-saver, plan for FIRE? → Strongly Roth. Your retirement might span 40+ years and tax rates may rise.
  • You’re mid-career and expect retirement spending to drop substantially? → Traditional often wins.

Key Differences

FeatureTraditional IRARoth IRA
ContributionPre-tax (deduction now)Post-tax (no deduction)
GrowthTax-deferredTax-free
Withdrawal TaxTaxed as income100% tax-free
Required Distributions (RMDs)Yes, starting age 73None during owner’s lifetime
Income LimitsDeduction phases outPhases out at $146-161K (single)
Early Withdrawal10% penalty + tax before age 59½Contributions any time penalty-free
2025 Contribution Limit$7,000 ($8,000 age 50+)Same

Hidden Roth Advantages

  • No RMDs — let it grow tax-free for life and pass to heirs.
  • Tax diversification — having both Roth + Traditional gives you flexibility to manage tax brackets in retirement year-by-year.
  • Withdrawals don’t affect Social Security taxation — Traditional withdrawals can push your provisional income up enough to make 85% of SS taxable.
  • Better for legacy planning — heirs get tax-free distributions; with Traditional, they pay income tax on RMDs over 10 years.
  • Hedge against future tax hikes — Federal tax rates are at historical lows; many expect rises.

Worked Example

Example: $7,000/year for 30 years at 9% return. Both grow to ~$954,000.
Example: Traditional path: 22% current tax means contributions saved $46,200 over 30 years. At retirement, withdrawing at 22% costs $210,000. Net after-tax ≈ $744,000. (Plus the saved tax invested separately could be worth more — but most don’t reinvest the tax savings.)
Example: Roth path: Pay 22% on $7,000 each year ($1,540 cost over 30 years = $46,200 nominal but with opportunity cost). Withdraw $954,000 fully tax-free.
Example: If retirement tax rate is the SAME 22%, outcomes are mathematically identical (assuming you reinvest the Traditional tax savings). If retirement tax rate rises to 32%, Roth wins by $95,000+. If retirement rate drops to 12%, Traditional wins by $95,000+.

Frequently Asked Questions

Should I convert Traditional to Roth?▾
Roth conversions can be powerful — pay tax now (in a low-income year, post-retirement, before RMDs) to convert pre-tax savings to tax-free. Common strategy in early-retirement gap years when income is artificially low.
Can I contribute to both?▾
Yes — combined limit is $7,000 (or $8,000 age 50+). Many people split: Roth for current year contributions, Traditional via 401(k) for higher-cap pre-tax savings.
What about a Roth 401(k)?▾
Same Roth tax treatment but with the higher 401(k) contribution limit ($23,000+ in 2025). If your employer offers it AND your tax-rate analysis says Roth, contribute Roth 401(k) up to the limit.
Why isn’t Roth always better?▾
Because pre-tax contributions earn returns on the entire amount including the deferred tax. If your tax rate truly drops in retirement, you come out ahead. The real risk: tax rates may rise, your retirement income may be higher than expected, or RMDs force taxable withdrawals at inconvenient times.

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