Roth vs. traditional IRA explained

Individual Retirement Accounts (IRAs) are tax-advantaged accounts designed to help you save for retirement outside an employer plan. The two main types — traditional and Roth — differ in when you get the tax benefit, not in what you can invest in. Both can hold stocks, bonds, mutual funds, and other securities. The choice between them comes down to tax timing: pay taxes now with a Roth, or defer taxes with a traditional IRA and pay on withdrawal. This guide covers contribution limits, income restrictions, required minimum distributions, tax diversification, and the scenarios where each account type tends to win.

The core difference: tax timing

A traditional IRA contribution may be tax-deductible in the year you contribute, depending on your income and whether you or your spouse are covered by a workplace retirement plan. The money grows tax-deferred, meaning you owe no taxes on dividends, interest, or capital gains inside the account. When you withdraw in retirement, every dollar — contributions and earnings — is taxed as ordinary income at your rate in the withdrawal year.

A Roth IRA works in reverse. You contribute with after-tax dollars — no deduction on your current return — but qualified withdrawals in retirement are completely tax-free, including all investment growth. The SEC summarizes the trade-off clearly: traditional IRAs offer a tax break upfront; Roth IRAs offer tax-free income later.^[4]

The practical question is whether your tax rate is higher now or will be higher in retirement. If you expect to be in a lower bracket after you stop working, a traditional IRA's upfront deduction may save more in taxes over your lifetime. If you expect rates to rise — or your income to grow substantially — paying taxes now at a lower rate and withdrawing tax-free later favors Roth. No one knows future tax law with certainty, which is why holding both account types (tax diversification) is a common strategy.

Use the Roth vs. traditional IRA calculator to compare projected after-tax balances under different tax-rate assumptions.

2024 contribution limits

For tax year 2024, the IRS set the combined IRA contribution limit at $7,000 for people under age 50 and $8,000 for those 50 and older (including a $1,000 catch-up contribution).^[6] This limit applies to the total of all traditional and Roth IRA contributions you make across all accounts — you cannot contribute $7,000 to each type separately.

You must have earned income — wages, salary, or self-employment income — at least equal to your contribution. If you earn $4,000 in a year, your maximum IRA contribution is $4,000 regardless of the statutory limit. Spousal IRAs allow a working spouse to contribute on behalf of a non-working spouse, effectively doubling the household limit for couples where one partner does not have earned income.^[1]

The deadline for 2024 IRA contributions is Tax Day 2025 (typically April 15), giving you a window to make prior-year contributions after the calendar year ends. If you also have access to a 401(k) or similar workplace plan, IRA limits are separate — you can max out both. The 401(k) contribution calculator helps you plan employer-plan contributions alongside your IRA strategy.

Roth IRA income limits

Unlike traditional IRAs, Roth contributions are restricted by modified adjusted gross income (MAGI). For 2024, single filers and heads of household can make a full Roth contribution if MAGI is below $146,000. The contribution limit phases out between $146,000 and $161,000, and no direct Roth contribution is allowed above $161,000. For married couples filing jointly, the full contribution is available below $230,000, with a phase-out range of $230,000 to $240,000.^[2]

If your income exceeds the Roth limit, you may still be able to fund a Roth through a "backdoor Roth" strategy — contributing to a traditional IRA (which has no income limit for non-deductible contributions) and then converting to Roth. This approach has nuances, including the pro-rata rule if you hold existing traditional IRA balances, and is best discussed with a tax professional for your specific situation.

Traditional IRA deductibility also has income limits if you or your spouse are covered by a workplace plan. High earners can still contribute to a traditional IRA, but the contribution may not be deductible — in that case, a Roth or backdoor Roth may be more tax-efficient than a non-deductible traditional contribution.

Required minimum distributions (RMDs)

Traditional IRAs are subject to required minimum distributions — mandatory withdrawals that begin once you reach a specified age, whether or not you need the money. Under current law (SECURE 2.0), RMDs start at age 73 for account owners who reach that age after December 31, 2022. The IRS publishes life-expectancy tables to calculate the minimum amount you must withdraw each year; failing to take an RMD triggers a substantial penalty.^[3]

Roth IRAs have no RMDs during the original account owner's lifetime. You can leave money invested and growing tax-free for as long as you live, making Roth accounts attractive for estate planning and for retirees who do not need to tap their IRA for living expenses. Note that inherited Roth IRAs do have distribution requirements for beneficiaries under current SECURE Act rules.

RMDs matter for tax planning because they force taxable income in retirement whether you want it or not. A large traditional IRA balance can push you into a higher tax bracket, increase Medicare Part B and Part D premiums (IRMAA surcharges), and affect the taxation of Social Security benefits. Roth balances do not create this pressure because qualified withdrawals are not included in taxable income.

For how RMDs interact with sustainable spending rates, see our safe retirement withdrawals guide and use the retirement withdrawal calculator to model portfolio longevity under different withdrawal strategies.

Tax diversification

Tax diversification means holding retirement savings across accounts with different tax treatments — traditional (tax-deferred), Roth (tax-free), and taxable brokerage accounts (capital gains rates). No one can predict future tax rates, income needs, or policy changes decades in advance. Holding multiple account types gives you flexibility to manage your taxable income in retirement by choosing which bucket to draw from each year.

The SEC's retirement toolkit emphasizes that saving consistently matters more than perfectly optimizing account type, but diversification adds optionality.^[5] In a year when you need extra cash but want to stay in a lower tax bracket, Roth withdrawals avoid increasing taxable income. In a year when you are already in a low bracket, traditional withdrawals may cost little in taxes. Taxable accounts offer yet another lever — long-term capital gains may be taxed at preferential rates.

Many financial planners recommend contributing enough to a traditional 401(k) to capture any employer match, then splitting additional savings between Roth and traditional accounts based on current tax bracket and expected future income. Young workers in low brackets often favor Roth; peak earners in high brackets often favor traditional deductions — but exceptions abound.

When a traditional IRA wins

A traditional IRA tends to be the better choice when your current marginal tax rate is higher than you expect in retirement. Peak earners in their highest-income years get the most value from an immediate deduction. If you are in the 32 percent or 35 percent bracket now and expect to withdraw in the 22 percent or 24 percent bracket in retirement, the upfront tax savings on contributions can outweigh the tax cost on withdrawals.

Traditional IRAs also win when you need the tax deduction to afford contributing at all. A $7,000 traditional contribution that reduces your tax bill by $1,540 (at 22 percent) effectively costs you $5,460 out of pocket — making saving easier than the full $7,000 Roth contribution from after-tax dollars.

If you expect to retire in a state with no income tax after working in a high-tax state, traditional deferral captures the high-rate deduction now and allows withdrawals at lower combined federal and state rates later. Conversely, if you plan to retire in a higher-tax state, Roth contributions made while living in a low-tax state look more attractive.

When a Roth IRA wins

Roth IRAs shine when your current tax rate is low and you expect it to rise. Early-career workers, graduate students, and anyone in a temporarily low bracket benefit from locking in today's rates. All future growth escapes taxation entirely — and decades of compounding in a tax-free wrapper can be worth far more than the upfront deduction. See our compound growth basics guide for why long time horizons amplify this advantage.

Roth accounts also win for flexibility. You can withdraw contributions (not earnings) at any time without tax or penalty, making Roth IRAs a backup layer for emergencies — though draining retirement savings for non-retirement needs should be a last resort. There are no RMDs during your lifetime, so Roth money can stay invested longer. And tax-free Roth withdrawals do not count toward provisional income that triggers Social Security taxation or Medicare surcharges.

If you believe tax rates will rise broadly — due to federal deficits, policy changes, or sunset provisions on current tax cuts — paying taxes now at known rates hedges against that uncertainty. Inflation erodes the real value of future tax deductions; Roth contributions are made with today's dollars at today's rates. Our inflation and savings guide explains how purchasing power affects long-term planning.

Use the retirement projection calculator to model how Roth and traditional balances grow under different contribution and return assumptions over your working years.

Roth vs. traditional and Social Security

Your choice of IRA type affects more than just income tax on withdrawals. Up to 85 percent of Social Security benefits may be taxable depending on your "combined income" — adjusted gross income, plus nontaxable interest, plus half of Social Security benefits. Traditional IRA withdrawals count toward that calculation; Roth qualified withdrawals do not.

This interaction makes Roth savings valuable for retirees who want to keep Social Security taxation in check or stay below Medicare IRMAA thresholds. For a deeper look at when to claim benefits — which also affects your retirement income mix — see our Social Security claiming ages guide.

Conversion and rollover considerations

You can convert a traditional IRA to a Roth IRA at any time by paying income tax on the converted amount. Conversions make sense in low-income years — a sabbatical, early retirement before Social Security and RMDs begin, or a year with large deductions — when the tax cost is temporarily reduced. Partial conversions spread over multiple years can fill lower tax brackets without jumping into a higher one all at once.

Rolling over a 401(k) from a former employer into an IRA preserves tax-deferred status. Rolling into a traditional IRA keeps the tax deferral; rolling into a Roth triggers immediate taxation on the converted amount. The right choice depends on the same tax timing analysis as direct contributions. The IRS provides guidance on rollover rules and the one-rollover-per-year limit for IRA-to-IRA transfers.^[1]

Quick answers

Can I contribute to both a Roth and traditional IRA in the same year? Yes, but the combined contribution cannot exceed the annual limit ($7,000 for 2024, or $8,000 if you are 50 or older). You might split $3,500 into each type, for example, but you cannot double the limit by using both account types.

Is a Roth IRA better for young investors? Often, yes — young workers are typically in lower tax brackets and have the longest time horizon for tax-free compounding. However, if a young worker has no emergency fund and high-interest debt, addressing those priorities may come before maximizing IRA contributions of either type.

What happens to my IRA when I die? Both traditional and Roth IRAs pass to named beneficiaries. Under the SECURE Act, most non-spouse beneficiaries must withdraw the entire inherited account within ten years. Spouses have additional options, including treating the account as their own. Roth inherited accounts still benefit from tax-free growth during the ten-year window, while traditional inherited accounts generate taxable income on each withdrawal.