Roth IRA vs 401(k): Which Is Better?

The Short Answer: Use Both, in This Order

For most people, the best answer is not either/or — it is both, in a specific order. First, contribute enough to your 401(k) to get the full employer match — that is an immediate 50–100% return on the matched dollars, and no tax argument beats free money. Second, fund a Roth IRA up to the $7,500 annual limit, because its tax-free growth and flexibility are hard to beat. Third, go back to the 401(k) with whatever is left, up to the $24,500 employee limit. The rest of this guide explains why that order works, and when to break it.

The core difference is when you pay tax. A traditional 401(k) takes contributions before income tax: every dollar you put in lowers your taxable income this year, and you pay ordinary income tax when you withdraw the money in retirement. A Roth IRA works the other way: you contribute money you have already paid tax on, and qualified withdrawals — after age 59½, once the account has been open at least five years — come out completely tax-free, growth included. Which one leaves you richer depends on whether your tax rate is higher now or in retirement. If your rate will be lower in retirement, the 401(k) usually wins; if it will be higher, the Roth usually wins.

Roth IRA vs 401(k) at a Glance (2026)

The limits come from the IRS: Notice 2025-67 and news release IR-2025-111, published November 13, 2025. The IRA limit rose to $7,500 for 2026, up from $7,000 in 2025, with a $1,100 catch-up at 50+ (up from $1,000). The 401(k) employee limit rose to $24,500, with an $8,000 catch-up at 50+ and a higher $11,250 "super catch-up" for ages 60–63 under SECURE 2.0. The combined employee-plus-employer 401(k) limit for 2026 is $72,000. Note that the IRA limit covers all your IRAs combined — you cannot put $7,500 in a Roth and another $7,500 in a Traditional in the same year.

The size gap between the two limits is the first thing to understand. A 401(k) lets you shelter more than three times as much per year as an IRA. Maxing a 401(k) at $24,500 a year for 30 years at a 7% average return projects to $2,490,774.12 (monthly contributions, no employer match, starting from zero). Maxing a Roth IRA at $7,500 a year over the same period reaches $708,455.90. The Roth's tax-free withdrawals are valuable, but the 401(k)'s room is what builds a seven-figure balance — which is why the standard advice ends with "then go back to the 401(k)".

The Tax Question, With Real Numbers

Take a saver contributing the $7,500 Roth IRA maximum each year for 30 years at a 7% average return, in the 22% tax bracket today. Run it through the Roth IRA Calculator: total contributions are $225,000, the account grows to $708,455.90, and $483,455.90 of that is investment growth. Tax paid on the Roth contributions along the way is $49,500 ($1,650 a year at 22%). Now the question is what the same money is worth after tax in each account, at three different retirement tax rates:

At first glance the Roth wins every row — even at a 12% retirement rate, where the textbook says the Traditional should win. That is not a mistake in the arithmetic; it is a consequence of what the comparison holds equal, and it is important to understand before you act on the table.

Why the Roth "Wins" Every Row — Read This Before Deciding

The calculator compares equal nominal contributions: $7,500 a year into each account. But a Roth contribution and a Traditional contribution do not cost the same out of pocket. The Roth saver's $7,500 is after-tax money — they also paid $1,650 of tax on it, so their real annual cost is $9,150. The Traditional saver's $7,500 is pre-tax: if it is deductible, they save $1,650 of tax, so their real annual cost is $5,850. The Roth saver in this comparison is effectively putting more real money to work, which is why the Roth balance comes out ahead at every tax rate in the table.

A strict comparison would invest the Traditional saver's $1,650 annual tax saving alongside the Traditional account — and if that saving were invested too, the gap would close. The honest rule of thumb stays the same, and it is the one to decide by: if your retirement tax rate will be lower than today's, the Traditional usually wins; if it will be higher, the Roth usually wins; if the rates are equal, the two come out roughly the same on an equal after-tax-cost basis. The table above is still useful — it shows the size of the tax bill on a Traditional withdrawal at each rate, which is real money either way — but do not read the "Roth by" column as a pure tax advantage. It is mostly a contribution-size effect.

That said, the Roth has a genuine edge the table understates: flexibility. Roth contributions (not earnings) can be withdrawn at any time without tax or penalty, which makes a Roth IRA a usable — if not ideal — emergency backstop. Roth IRAs have no required minimum distributions during your lifetime, so you control when, or whether, the money comes out. And the tax-free growth is most valuable when you have decades for it to compound: in the 30-year example above, $483,455.90 of the $708,455.90 balance is growth, and in a Roth, none of that growth is ever taxed.

The Employer Match: The Deciding Factor

Everything above assumes you are choosing between accounts with your own money. The 401(k) has something the Roth IRA can never offer: the employer match. Take the standard example from our retirement guide — a 30-year-old earning $70,000, with $10,000 already saved, contributing 10% of salary ($7,000 a year) with a 4% employer match ($2,800 a year), retiring at 65 with a 7% average return. Run it through the 401(k) Calculator and the projection is $1,585,922.78 at retirement, on $353,000 of total contributions. Now remove the match and run the same 10% contribution alone: the balance falls to $1,165,676.70. The match alone is worth $420,246.07 over 35 years — from $98,000 of employer contributions that cost the saver nothing.

That is why the match always comes first, whatever the tax analysis says. A 100% immediate return on matched dollars beats any plausible tax-rate difference between now and retirement. If your employer matches, contribute at least enough to get all of it before putting a dollar anywhere else. If your employer does not match, the 401(k) loses its biggest advantage, and the Roth IRA's flexibility and tax-free growth make it the stronger first choice for most savers in lower brackets.

Income Limits: Who Cannot Use a Roth IRA

The 401(k) has no income limit for contributing — anyone with an employer plan can use it. The Roth IRA does. For 2026, the ability to contribute directly to a Roth IRA phases out between $153,000 and $168,000 of modified adjusted gross income (MAGI) for single filers, and between $242,000 and $252,000 for married couples filing jointly. Above the top of the range, you cannot contribute directly at all. (A "backdoor" Roth — contributing to a Traditional IRA and converting it — is a workaround high earners use, but it has complications, including the pro-rata rule if you hold other pre-tax IRA balances, and it is worth professional advice before attempting.)

The phase-outs are one more reason the 401(k) matters: for high earners, it is often the only tax-advantaged account with real room. And from 2026, there is a wrinkle inside the 401(k) itself — if your prior-year FICA wages from the employer sponsoring the plan exceeded $150,000, catch-up contributions must be Roth (after-tax) under SECURE 2.0. That does not change the match-first advice, but it is one more reason to check your plan's rules rather than assuming last year's setup still applies.

Starting at 50: The Catch-Up Years

Late starters get extra room. At 50 or older, the IRA limit rises to $8,600 for 2026 (the $7,500 base plus the $1,100 catch-up), and the 401(k) employee limit rises to $32,500 — or $35,750 at ages 60–63 with the super catch-up. Take a 50-year-old contributing the full $8,600 a year to a Roth IRA for 15 years at 7%: total contributions are $129,000, tax paid along the way at 22% is $28,380, and the account reaches $216,109.59 — tax-free. The same money in a Traditional IRA would be worth $168,565.48 after 22% tax on withdrawal. Fifteen years is still enough time for compounding to do serious work: $87,109.59 of the final balance is growth. The catch-up limits exist precisely because the last 15 working years are often the highest-earning ones, and using them is the fastest way to close a savings gap.

Which Should You Choose? A Decision Framework

Early career, lower income, lower bracket: Roth IRA first (after the match). You are paying tax at the lowest rate you are likely to see, and the money has 30–40 years to grow tax-free. A 25-year-old in the 12% bracket who expects to be in the 22% bracket in retirement is the textbook Roth case.

Peak earning years, high bracket: traditional 401(k) beyond the match. The deduction is worth 24% or 32% today, and if you retire into a lower bracket, you pay less on the way out. This is also the case for maxing the 401(k)'s $24,500 room — the Roth's $7,500 ceiling is too small to hold a high earner's full saving rate.

Uncertain about future rates: split it. Contributing to both accounts hedges against unknown future tax rates and gives you flexibility in retirement: you can draw from the Traditional account up to the top of a low bracket each year, then take the rest tax-free from the Roth. Tax diversification is as real as investment diversification, and most savers end up with both accounts anyway.

No employer plan at all: the Roth IRA is your main tax-advantaged account, and the $7,500 limit is your ceiling — use it. If you are self-employed, a Solo 401(k) offers the same $24,500 employee limit plus employer contributions, which changes the picture entirely.

One final point, and the most important one: the difference between the two accounts is real but modest compared with the difference between saving and not saving. Thirty years of $7,500 contributions at 7% turns $225,000 into $708,455.90 either way, and the growth — $483,455.90 of it — dwarfs the tax difference in most scenarios. The contribution limit is also "use it or lose it" each year, so starting now matters more than picking perfectly. Run your own numbers in the calculators, pick the account that fits your situation, and let time do the heavy lifting.

Sources: 2026 limits from IRS Notice 2025-67 and news release IR-2025-111 (Nov. 13, 2025): IRA $7,500 ($8,600 at 50+, $1,100 catch-up); 401(k) $24,500 ($32,500 at 50+; $35,750 at ages 60–63; $72,000 total additions); Roth IRA MAGI phase-outs $153,000–$168,000 (single) and $242,000–$252,000 (joint); Roth catch-up required above $150,000 prior-year FICA wages under SECURE 2.0 §603. RMD ages under SECURE 2.0: 73 (75 if born in 1960 or later); Roth 401(k) RMDs eliminated from 2024. All projections were produced by running the Roth IRA Calculator (equal nominal annual contributions, year-end, fixed return) and the 401(k) Calculator (monthly contributions). Last reviewed: 13 November 2026.

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