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Glossary · Definition

Roth vs traditional IRA

Roth IRA: contributions are after-tax, withdrawals are tax-free. Traditional IRA: contributions are pre-tax (deductible), withdrawals are taxed as ordinary income. Pick Roth if you expect higher tax bracket in retirement than now; pick traditional if you expect lower.

Updated May 2026 · 4 min read
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Definition

Roth IRA: contributions are after-tax, withdrawals are tax-free. Traditional IRA: contributions are pre-tax (deductible), withdrawals are taxed as ordinary income. Pick Roth if you expect higher tax bracket in retirement than now; pick traditional if you expect lower.

What it means

The key tax-equivalence math: if your tax bracket is the same now and in retirement, Roth and traditional produce identical after-tax wealth. The break-even bracket is roughly 22-24%. Above that (current bracket higher than expected retirement bracket), traditional usually wins because the upfront deduction earns return for decades. Below that (current bracket lower), Roth wins. Other factors that tilt toward Roth: estate-planning flexibility (no required minimum distributions), withdrawal flexibility (contributions accessible tax-free at any age), low current bracket (early career), and pessimism about future tax rates. Factors that tilt traditional: high current bracket and confident lower retirement bracket, current need for AGI reduction (qualifying for ACA subsidies, child tax credit, student loan interest deduction).

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Why it matters

Most retirement-planning advice oversimplifies the choice. The full optimization considers: federal bracket now vs expected, state-tax bracket now vs retirement state, RMD obligations on traditional, tax-bracket management in retirement (Roth conversions in low-income early-retirement years), and estate planning for non-spouse beneficiaries. Most people benefit from diversifying — some Roth, some traditional — to hedge tax-policy uncertainty. Backdoor Roth and mega-backdoor Roth strategies handle high-income workers above the Roth phase-out.

Example

32% bracket now, 22% in retirement: $7,000 traditional → $7,000 deduction saves $2,240 now; balance grows to $30K, withdrawn at 22% = $23,400 net. $7,000 Roth → no deduction; balance grows to $30K, withdrawn tax-free = $30K net. Roth wins by $6,600. But: if retirement bracket is 32% (same as now), both equal $20,400 after tax. Bracket equality = neutral choice.

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Frequently asked questions

What is the Roth IRA income phase-out?

2024: $146-161K single, $230-240K married filing jointly. Above the upper limit, no direct Roth contribution allowed (use backdoor strategy).

Can I contribute to both?

Yes, but combined limit is the IRA cap ($7K under 50 / $8K 50+ in 2024). Many people split: half Roth, half traditional, for tax diversification.

What about Roth 401k vs Traditional 401k?

Same Roth-vs-traditional tax math, but contribution limit is higher ($23K) and there’s no income phase-out. Many high earners use Roth 401k to avoid the IRA limits.

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