Pay tax now or later? The same dollars through both accounts, compared honestly
| Traditional | Roth |
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Roth or Traditional is a one-variable problem wearing a complicated costume: if your tax rate at contribution equals your rate at withdrawal, the two accounts produce identical spendable money — mathematically, provably, always. The entire decision is a bet on which rate is higher. This calculator runs the equal-outlay comparison correctly (most online versions don't) and then walks the tiebreakers that matter when the bet is close.
Multiplication commutes — the only difference between the formulas is which tax rate applies. The frequent claim that Roth wins because "growth is tax-free" double-counts: Traditional's growth on the not-yet-taxed portion exactly offsets the eventual tax when rates match. The honest comparison holds pre-tax outlay equal, as this tool does.
| Situation | Lean | Why |
|---|---|---|
| Early career, 10–12% bracket | Roth | You'll likely never be taxed this low again |
| Peak earnings, 24–35% bracket | Traditional | Most retirees fill lower brackets than their peak years — retirement income starts at 0% and climbs through the brackets |
| Middle (22%), uncertain future | Split both | Tax diversification hedges the guess |
| Expecting big tax-rate increases by law | Roth lean | Legitimate hedge, though brackets have been surprisingly stable for 40 years |
The under-appreciated point favoring Traditional for high earners: contributions dodge your marginal (top) rate, but withdrawals fill up from the bottom — the standard deduction and lower brackets first. A retiree spending $80k from Traditional accounts pays an effective rate far below 22% even though their old contributions each saved 24–32%.
No — that's the most repeated error in retirement advice. With equal tax rates, Traditional's upfront deduction exactly offsets its withdrawal tax; the accounts tie to the penny. Roth wins only when your withdrawal rate exceeds your contribution rate (or via the tiebreakers).
Start from planned spending: withdrawals fill the standard deduction and brackets from the bottom, so effective rates run well below your working marginal rate. Most retirees without pensions land in the 10–12% effective range — one reason Traditional wins more often than the Roth marketing suggests.
Same tax treatment, different wrappers: the 401(k) version has big limits and payroll ease; the IRA has unlimited fund choice and lower fees. Common combo: Traditional 401(k) for the deduction + Roth IRA for diversification.
High earners above the Roth IRA income limits contribute to a non-deductible Traditional IRA and immediately convert to Roth — legal and routine, with a pro-rata trap if you hold other pre-tax IRA balances. The Roth Conversion tool covers conversions in depth.
Historically matched dollars were always pre-tax; SECURE 2.0 now lets plans offer Roth match (taxed to you when contributed). Either way, match dollars land regardless of your own Roth/Traditional choice.
Contributions are per-year decisions — switch anytime going forward, and Roth conversions can move Traditional money to Roth later (paying tax at conversion). Low-income years between jobs or early retirement are prime conversion windows.
Yes — everything computes locally in your browser.
Guess your retirement bracket honestly, let the calculator score the bet, and hedge with both accounts when the score is close. The worst choice is paralysis — either account beats the taxable alternative by a mile.