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The key differences between a Roth and traditional IRA

Nicolas StrautBy Nicolas StrautUpdated 9 min read
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Key takeaways

  • A traditional IRA and a Roth IRA share the same contribution limit, $7,500, or $8,600 if you are 50 or older, and then tax the money at opposite ends.1
  • The main difference between a Roth and traditional IRA is when you pay the tax: a traditional IRA defers it to withdrawal, a Roth prepays it, and at the same marginal rate both produce exactly the same after-tax result.
  • Tweed's retirement calculator turns a guess about your future tax bracket into a number. Your future tax bracket is the one input this decision depends on.
In this article

A traditional IRA gives you a deduction now and taxes the withdrawal later. A Roth gives you no deduction and never taxes the withdrawal. If your tax rate is the same in both years, the two produce identical results. The decision depends on which rate is higher, now or later.

Roth vs traditional IRA at a glance

A traditional IRA runs on IRC §408 and a Roth IRA on IRC §408A, and every other difference between them follows from that split.2

Scroll horizontally to see more columns.
 Traditional IRARoth IRA
ContributionsPre-tax if deductible, otherwise after-tax with basisAlways after-tax
Qualified withdrawalsTaxed as ordinary incomeNot taxed
Contribution limit$7,500, or $8,600 at 50+$7,500, or $8,600 at 50+
Income limit on contributingNone, with earned incomeYes, by MAGI
Income limit on deductingYes, if covered by a workplace planNot applicable, never deductible
Lifetime required minimum distributionsYes*None for the original owner
Withdrawing your own contributions earlyTaxed, plus 10% unless an exception appliesAny time, tax-free and penalty-free
  • The $7,500 limit above is combined across every IRA you own, not a separate cap per account.
  • *RMD ages run 73 for those born 1951 to 1958 and 75 for those born 1960 or later. The 1959 cohort is unresolved: the statute is internally inconsistent, the regulation covering it is formally reserved, and the proposed rule that would set the age at 73 has not been finalized. What a traditional IRA is has the full picture.

What are the 6 key differences between a Roth IRA and a traditional IRA?

There are six differences between a Roth IRA and a traditional IRA, and every one of them traces back to a single choice: when you pay the tax.

When you pay the tax

This is the difference that matters mathematically: a traditional IRA defers the tax, while a Roth prepays it. Every item below follows from that one choice.

Whether you can contribute at all

A Roth has an income ceiling. A traditional IRA does not, as long as you have earned income.

Whether you get a deduction

A traditional contribution is deductible only if you and your spouse fall outside the workplace-plan phase-out. A Roth contribution is never deductible, by design.

Whether you are forced to take the money out

A traditional IRA carries lifetime required minimum distributions; missing one now costs 25%, or 10% if corrected within the window, down from 50% before SECURE 2.0.3 A Roth has none for the original owner. This is also why a Roth can last longer as an estate asset.

How easily you can reach the money early

Roth contributions, though not earnings, come out at any age tax-free and penalty-free, because the tax was already paid.4 Traditional withdrawals before 59½ are ordinary income plus a 10% penalty unless an exception applies. That access matters most if you plan to stop working well before 59½, the goal behind the FIRE movement.

What your heirs receive

Both accounts follow the 10-year rule for most non-spouse beneficiaries. Withdrawals from an inherited traditional IRA are taxed as ordinary income, often during the heir's peak-earning years, while withdrawals from an inherited Roth are not. The Tweed inherited IRA RMD calculator shows which rule applies to an heir and the yearly amount.

What are the income limits for a Roth and a traditional IRA?

There are two different income limits attached to an IRA, and they get confused constantly: one decides whether you can contribute to a Roth at all, and the other decides only whether a traditional contribution is deductible.

Can you contribute to a Roth IRA this year?

Yes, as long as your income falls under the limit for your filing status, since this limit decides whether you may contribute at all.

Scroll horizontally to see more columns.
Filing statusFull contribution belowPhase-out rangeIneligible at or above
Single or head of household$153,000$153,000 to $168,000$168,000
Married filing jointly$242,000$242,000 to $252,000$252,000
Married filing separately, living with spousen/a$0 to $10,000$10,000

Above the ineligible threshold you cannot contribute to a Roth directly, but converting a nondeductible traditional contribution afterward has no income limit. Backdoor Roth IRA covers that route and the pro-rata rule that comes with it.

Can you deduct a traditional IRA contribution this year?

Whether you can deduct a traditional IRA contribution depends only on workplace-plan coverage for you or your spouse, and this limit applies only to the deduction, never to whether you can contribute.

Scroll horizontally to see more columns.
SituationFull deduction belowPhase-out rangeNo deduction at or above
Single or HOH, covered by a plan$81,000$81,000 to $91,000$91,000
MFJ, contributor covered by a plan$129,000$129,000 to $149,000$149,000
MFJ, contributor not covered, spouse is$242,000$242,000 to $252,000$252,000
Neither spouse covered by a planNo limitn/an/a
  1. You can always contribute to a traditional IRA if you have earned income. There is no income ceiling on contributing, only on deducting, so nothing stops someone earning $400,000 from putting $7,500 into a traditional IRA.
  2. A nondeductible contribution creates basis, which means filing Form 8606 every year for the life of the account and pro-rata exposure on any future withdrawal or conversion. A nondeductible contribution is the least attractive outcome, and people often end up with one by accident.
  3. Coverage is determined by whether you were an active participant for any part of the plan year, not the whole year, and your W-2 box 13 is the indicator.5 What a traditional IRA is walks through that test in full.

How to work out your break-even tax rate

Your break-even tax rate is your current marginal rate: above it, a traditional IRA wins, and below it, a Roth wins. That is true because of a simple identity: if your marginal tax rate is the same in the year you contribute and the year you withdraw, a traditional IRA and a Roth IRA produce identical after-tax dollars. Multiplication is commutative, so taxing before growth and taxing after growth produce the same result when the rate does not change.

The formula behind that identity is not complicated. A traditional IRA gives you your contribution, multiplied by growth, multiplied by one minus your future tax rate. A Roth gives you your contribution, multiplied by one minus your current tax rate, multiplied by the same growth. The only difference between the two formulas is which tax rate is subtracted.

What $7,500 looks like at four different withdrawal rates

A single $7,500 contribution at a 22% current marginal rate, invested for 30 years at 7%, grows to $57,092 before tax. The traditional column assumes the full $7,500 is invested pre-tax and taxed on the way out. The Roth column assumes that same pre-tax income is taxed at 22% first, so only $5,850 gets invested.

Scroll horizontally to see more columns.
Marginal rate when you withdrawTraditional, after taxRoth, after taxWhich wins
12%$50,241$44,532Traditional
22%, same as today$44,532$44,532Neither, exactly equal
24%$43,390$44,532Roth
32%$38,823$44,532Roth, by more

Why $7,500 in a Roth is more money than $7,500 in a traditional IRA

Both accounts share the same $7,500 ceiling, but Roth dollars are already after-tax and traditional dollars are not, so filling a Roth shelters more real purchasing power. The fair comparison is $7,500 in a Roth vs $7,500 in a traditional IRA plus the deduction's tax savings invested separately, where that side account then owes its own tax every year. This difference only matters if you max out every year. If you contribute less than the limit, it doesn't apply.

What state income tax does to the answer

Your break-even rate is federal plus state, and state rates can move the answer by more than a full bracket. Contributing in a high-tax state and later retiring somewhere with no state income tax favors a traditional IRA, and the reverse favors a Roth. Several states also exempt some retirement income. That exemption is a third variable, and a good reason to keep the forecast simple.

How to choose between a Roth and a traditional IRA

Neither account is better in general. The break-even arithmetic above decides which account is better for you, and the conditions below describe when that arithmetic favors each account.

  • The arithmetic favors a Roth when: you are early career in the 10% or 12% bracket, expect your income to rise, already max out and want the larger real amount, or want no lifetime RMDs.
  • The arithmetic favors a traditional IRA when: you are in peak earning years at 24% or above, qualify for a full deduction, and expect lower income in retirement.
  • When your income makes the choice for you: above the Roth ceiling you cannot contribute directly, and above the deduction ceiling a traditional contribution buys basis instead of a deduction, which is exactly what backdoor Roth IRA solves.
  • A deliberate split: holding both account types lets you choose which one you draw from in a given year. That choice lets a retiree manage their own tax bracket after they stop working.
  • A larger conversion or withdrawal can raise Medicare premiums two years later through IRMAA, and can pull more of your Social Security benefit into taxable income;Roth conversion covers both in full.

What to do if you cannot guess your future tax rate

If you cannot forecast your bracket three decades out, that is normal, and three things are still true and useful without a forecast.

  1. "My bracket in retirement" is not a single number. Traditional withdrawals fill the standard deduction and the lower brackets first, so the effective rate on those dollars usually runs below your current marginal rate.
  2. Splitting contributions between the two accounts is a valid answer. A split lets you choose which account to draw from later, and a retirement calculator shows how each choice compounds.
  3. Uncertainty favors a Roth slightly, since a Roth also hedges against future changes to tax rates and has no lifetime RMDs for the original owner.

Can you contribute to both a Roth and a traditional IRA?

Yes, you can contribute to both in the same year. What you cannot do is contribute the full limit to each one, since the $7,500 ceiling, or $8,600 at 50 or older, applies across every IRA you own.

  • You can split $3,750 into each account without issue, but $7,500 into each one is an excess contribution.
  • If you also have a 401(k) at work, its limit is separate from your IRA limit, and Roth IRA vs 401(k) covers the Roth 401(k) and which account to fund first.
  • Splitting contributions is the practical form of the tax-diversification argument above. A split is the only answer to "I don't know my future rate" that requires no forecast.
  • An excess contribution costs 6% of the amount over the limit for every year it stays in the account. What a Roth IRA is covers how to fix one.

Which provider should you choose for your IRA?

For a mainstream IRA at a large brokerage, the account itself is free almost everywhere, so the provider matters far less than the two decisions above it: Roth or traditional, and what you invest in. When you compare providers, four things matter:

  • The fund menu, and whether the provider's own index funds carry a fee.
  • Whether fractional shares are supported, which matters for small or irregular contributions.
  • Whether there is an automated investing option, and what it charges annually.
  • How the provider handles a backdoor Roth conversion, if you expect to need one.

Some custodians impose a settlement hold before allowing a conversion, so ask before you open an account if a backdoor Roth is likely. See backdoor Roth IRA for the mechanics, and best Roth IRA accounts for the provider comparison.

Frequently asked questions about Roth and traditional IRAs

Can I roll a 401(k) into a Roth IRA?

Yes, you can roll a 401(k) into a Roth IRA, but the tax depends on where the money sits now. Roth 401(k) dollars move into a Roth IRA without tax, while pre-tax 401(k) dollars count as a conversion and are taxed as ordinary income in the year they move, exactly like converting a traditional IRA.

Do I have to pick the same account every year?

No, the choice is made fresh each year, and nothing commits you to repeating it. Your income, your tax bracket, and whether you are covered by a workplace plan can all change, and the better account can change with them. Many people end up holding both accounts for exactly this reason.

What is the difference between a Roth IRA and a Roth 401(k)?

A Roth 401(k) and a Roth IRA differ mainly in who controls the account and how much you can contribute. A Roth 401(k) is an employer plan with a much higher limit and no income ceiling, but your employer chooses its investment menu. A Roth IRA is yours, holds almost anything, and caps at $7,500.

Can I switch a traditional IRA to a Roth later?

Yes, converting a traditional IRA to a Roth is allowed at any age, in any amount, with no income limit. You cannot reverse a conversion once it is done. The converted amount is taxed as ordinary income in the year you convert. This is why the timing of a conversion is a separate decision from choosing between a Roth and a traditional IRA.

Does the choice change if I am self-employed?

No, the Roth vs traditional logic is identical for self-employed savers, but the accounts available to you are not. A solo 401(k) or SEP IRA usually allows far larger contributions than either IRA, so work out those contributions before this $7,500 decision.

Sources

  1. https://www.irs.gov/newsroom/401k-limit-increases-to-24500-for-2026-ira-limit-increases-to-7500
  2. https://www.law.cornell.edu/uscode/text/26/408A
  3. https://www.law.cornell.edu/uscode/text/26/4974
  4. https://www.irs.gov/publications/p590b
  5. https://www.irs.gov/retirement-plans/ira-deduction-limits
Nicolas Straut
Nicolas Straut

Personal finance writer, former Forbes contributor and This Week in Fintech writer. He isn't a financial advisor or a CPA.

nicstraut.com

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