What if my tax rate ends up the same in retirement?

Mathematically equivalent. The math: T(P*(1-r))*(1-r') vs T*(1-r')*(1-r) for identical r and r' is the same value. So 'equal rates' = no winner; pick based on other factors (RMDs, estate planning, tax diversification). The real question is whether r > r' or r < r' — and the magnitude of difference.

Should I do a Roth conversion?

Maybe. A Roth conversion (moving Traditional → Roth) means paying income tax NOW on the converted amount, in exchange for tax-free withdrawals later. Best when: (1) you're in a low-income year (sabbatical, between jobs, after retirement but before SS / RMDs); (2) you expect higher rates later; (3) you want to reduce future RMDs. Worst when: you're in your peak-earning year. Talk to a CPA — botched conversions can trigger significant tax bills.

Are Roth IRA contributions limited?

Yes — $7,000/year (2025), $8,000 if 50+, plus phase-out at higher incomes. MFJ phase-out: $230K-$240K MAGI in 2025. Above the phase-out, you can do a 'backdoor Roth' (contribute non-deductible Traditional → immediately convert to Roth), with caveats around the pro-rata rule if you have other Traditional IRA balances.

Why does the standard deduction matter?

Because it makes the first chunk of any year's income tax-free. In retirement: if your only income is from a Traditional IRA and SS, the first $30K (MFJ standard deduction 2025) is tax-free regardless of your bracket. So a retiree with $40K gross from Traditional IRA only pays tax on $10K — at low rates. This makes Traditional more attractive than naive 'effective rate' math suggests.

What about state taxes in retirement?

If you're working in a high-tax state (CA, NY) and plan to retire to a no-tax state (FL, TX, NV), Traditional is more attractive — you deduct now at high state rate, withdraw later at zero state rate. The opposite (work in TX, retire in CA) makes Roth more attractive.

What's the simplest rule of thumb?

If you're under 30 with normal income trajectory: lean Roth (rates likely lower than retirement). If you're at peak career earnings (40s-50s, top tax brackets): lean Traditional (current deduction is most valuable). If unsure: 50/50 split. Always capture employer match first regardless.

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Roth vs Traditional Breakeven

Q: Should I do a Roth conversion?

Maybe. A Roth conversion (moving Traditional → Roth) means paying income tax NOW on the converted amount, in exchange for tax-free withdrawals later. Best when: (1) you're in a low-income year (sabbatical, between jobs, after retirement but before SS / RMDs); (2) you expect higher rates later; (3) you want to reduce future RMDs. Worst when: you're in your peak-earning year. Talk to a CPA — botched conversions can trigger significant tax bills.

Q: Are Roth IRA contributions limited?

Yes — $7,000/year (2025), $8,000 if 50+, plus phase-out at higher incomes. MFJ phase-out: $230K-$240K MAGI in 2025. Above the phase-out, you can do a 'backdoor Roth' (contribute non-deductible Traditional → immediately convert to Roth), with caveats around the pro-rata rule if you have other Traditional IRA balances.

Q: Why does the standard deduction matter?

Because it makes the first chunk of any year's income tax-free. In retirement: if your only income is from a Traditional IRA and SS, the first $30K (MFJ standard deduction 2025) is tax-free regardless of your bracket. So a retiree with $40K gross from Traditional IRA only pays tax on $10K — at low rates. This makes Traditional more attractive than naive 'effective rate' math suggests.

Q: What about state taxes in retirement?

If you're working in a high-tax state (CA, NY) and plan to retire to a no-tax state (FL, TX, NV), Traditional is more attractive — you deduct now at high state rate, withdraw later at zero state rate. The opposite (work in TX, retire in CA) makes Roth more attractive.

Q: What's the simplest rule of thumb?

If you're under 30 with normal income trajectory: lean Roth (rates likely lower than retirement). If you're at peak career earnings (40s-50s, top tax brackets): lean Traditional (current deduction is most valuable). If unsure: 50/50 split. Always capture employer match first regardless.

Compare Roth and Traditional IRA tax math — find the breakeven retirement tax rate and see which option wins for you. Free, instant, online.

Updated June 2026

ContributionNow Rate %Retire Rate %

Roth

Net now: $5,320

Net later: $7,000

Traditional

Net now: $7,000

Net later: $5,460

Recommended

Roth

Your retirement tax rate looks similar or higher — lock in today’s rate.

For guidance only — not financial advice. Assumes equal growth, ignores state taxes.

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What it does

Compare Roth and Traditional retirement contributions side-by-side based on your current marginal tax rate vs. expected retirement marginal rate. The tool tells you which option produces more spendable money in retirement (after accounting for taxes), at what tax- rate breakeven point they tie, and the dollar difference per year of retirement.

The simple rule: Roth wins if you expect higher tax rates in retirement than now (pay tax now at lower rate, withdraw tax-free later); Traditional wins if you expect lower rates in retirement (deduct now at higher rate, pay tax later at lower rate). When rates are equal, they’re mathematically identical (no winner). Real-world tax rates are uncertain — politics, legislation, your own income trajectory all matter — so most planners recommend splitting between both for tax diversification.

Why people get this wrong: they assume their retirement rate will be lower because they’ll have less income. Often true (if you saved enough to retire, you probably had higher peak earnings). But not always:

Standard deduction grows: $30,000 (MFJ in 2025), so the first $30K of retirement income is tax-free regardless. Many retirees pay effective rates below their working years even with similar gross income.
Required Minimum Distributions (RMDs): starting at age 73, you MUST withdraw a percentage from Traditional IRAs each year — can push you into higher brackets unexpectedly. Roth IRAs have no RMDs.
Social Security taxation: depends on your other income; large Traditional IRA withdrawals can make SS partially taxable.
Estate planning: Roth IRAs pass to heirs tax-free; Traditional means heirs pay income tax on withdrawals. If leaving money to kids matters, Roth wins beyond pure self-tax math.

Most early-career workers should lean Roth — current rates likely lowest they’ll ever pay. Mid-career high-earners (peak income years) should lean Traditional — current marginal rate high, deduction valuable now. Always capture the employer match first regardless of Roth vs Traditional choice — that’s free money before any tax math.

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How to use it

Enter your current marginal tax rate. Federal-only is fine for general planning; add state for precision (CA: +9.3-13.3% on top brackets; FL/TX/etc: +0).
Enter your expected retirement marginal tax rate. Common starting point: same as current minus 5% (typical retirement income is ~80% of working income).
Set contribution amount (defaults to typical 401(k) max).
Read the comparison: which wins, by how much per year of retirement, and at what crossover rate they'd tie.
If retirement rate is uncertain, model multiple scenarios (best case, expected, worst case) and pick a strategy that performs reasonably well in all three. Most planners recommend ~50/50 split to hedge against tax-policy uncertainty.

When to use this tool

Choosing between Roth 401(k) and Traditional 401(k) for your contributions.
Choosing between Roth IRA and Traditional IRA contributions.
Considering a Roth conversion (paying tax now to convert Traditional → Roth).
Estate planning — Roth's no-RMD and tax-free-to-heirs features are valuable for some plans.

When not to use it

When you can't predict retirement rates well — split between both for diversification rather than betting on one outcome.
When you have other tax considerations (state-tax changes between working/retirement state, complex inherited IRAs, etc.) — talk to a CPA.
When you have access to a Roth 401(k) match policy — some employers match into Traditional regardless of which type you contribute. Capture the match in either case.
Anyone in or near retirement — most decisions are made in your accumulation years; near-retirement, focus on withdrawal strategy and tax-bracket management.

Common use cases

Pre-decision sanity-check on inputs and outputs
Educational use — demonstrating the underlying concept
Onboarding a colleague who needs the same calculation/conversion
Verifying a number or output before passing it on

Frequently asked questions

What if my tax rate ends up the same in retirement?: Mathematically equivalent. The math: T(P*(1-r))*(1-r') vs T*(1-r')*(1-r) for identical r and r' is the same value. So 'equal rates' = no winner; pick based on other factors (RMDs, estate planning, tax diversification). The real question is whether r > r' or r < r' — and the magnitude of difference.
Should I do a Roth conversion?: Maybe. A Roth conversion (moving Traditional → Roth) means paying income tax NOW on the converted amount, in exchange for tax-free withdrawals later. Best when: (1) you're in a low-income year (sabbatical, between jobs, after retirement but before SS / RMDs); (2) you expect higher rates later; (3) you want to reduce future RMDs. Worst when: you're in your peak-earning year. Talk to a CPA — botched conversions can trigger significant tax bills.
Are Roth IRA contributions limited?: Yes — $7,000/year (2025), $8,000 if 50+, plus phase-out at higher incomes. MFJ phase-out: $230K-$240K MAGI in 2025. Above the phase-out, you can do a 'backdoor Roth' (contribute non-deductible Traditional → immediately convert to Roth), with caveats around the pro-rata rule if you have other Traditional IRA balances.
Why does the standard deduction matter?: Because it makes the first chunk of any year's income tax-free. In retirement: if your only income is from a Traditional IRA and SS, the first $30K (MFJ standard deduction 2025) is tax-free regardless of your bracket. So a retiree with $40K gross from Traditional IRA only pays tax on $10K — at low rates. This makes Traditional more attractive than naive 'effective rate' math suggests.
What about state taxes in retirement?: If you're working in a high-tax state (CA, NY) and plan to retire to a no-tax state (FL, TX, NV), Traditional is more attractive — you deduct now at high state rate, withdraw later at zero state rate. The opposite (work in TX, retire in CA) makes Roth more attractive.
What's the simplest rule of thumb?: If you're under 30 with normal income trajectory: lean Roth (rates likely lower than retirement). If you're at peak career earnings (40s-50s, top tax brackets): lean Traditional (current deduction is most valuable). If unsure: 50/50 split. Always capture employer match first regardless.

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