If you are saving for retirement in the United States, two account names come up again and again: the Roth IRA and the 401(k). They are different containers for the same job — putting money aside now so it can support you later — and they differ mainly in when you pay tax, how much you can put in, and who can use them. The honest answer to “which is better in 2026?” depends on your income, your employer, and your tax position today compared with the one you expect in retirement. This guide explains both in plain English, using the 2026 limits published by the Internal Revenue Service (IRS). It is educational only, not personal financial advice.
What a 401(k) is
A 401(k) is a retirement plan offered through an employer. You ask your employer to take part of your pay before tax and put it into the plan, where it is invested, usually in a menu of funds chosen by the plan. You do not pay income tax on the money in the year you contribute it, and the growth is not taxed year by year. You generally pay income tax when you withdraw the money in retirement. Many employers also add matching money when you contribute, though the exact match varies and some employers match nothing. Check your plan documents: the match is one of the most important details in this comparison. Money you contribute yourself is always yours, while employer contributions may be subject to a vesting schedule. See our 401(k) guide.
What a Roth IRA is
A Roth IRA is an individual retirement arrangement that you open yourself, outside your employer’s plan, through a bank, broker or other provider. “Roth” describes the tax treatment, not a particular investment. You contribute money that has already been taxed — there is no tax deduction — and the money then grows inside the account. Qualified withdrawals in retirement are generally tax-free, including the growth, provided the IRS rules on age and holding period are met. That is the mirror image of the traditional 401(k): with a Roth IRA you pay tax now and, if the rules are satisfied, pay no tax on the way out. The comparison turns on whether your tax rate is likely to be higher now or later, which nobody can know with certainty.
The 2026 contribution limits, re-checked at irs.gov
The IRS announced the 2026 figures in news release IR-2025-111 on 13 November 2025, with the detail in Notice 2025-67. All figures below were re-checked against that IRS release on 13 November 2026. For a 401(k), 403(b), governmental 457 plan or the federal Thrift Savings Plan, the employee limit for 2026 is $24,500, up from $23,500 in 2025. If you are aged 50 or older, you can generally add a catch-up of $8,000, taking the total to $32,500. Workers aged 60 to 63 have a higher catch-up of $11,250 under the SECURE 2.0 Act, taking their total to $35,750. The combined limit for employee and employer contributions in 2026 is $72,000, or 100% of compensation if that is lower, not counting catch-ups.
For an IRA — traditional and Roth combined — the 2026 limit is $7,500, up from $7,000 in 2025. If you are aged 50 or older, the IRA catch-up is $1,100, up from $1,000, taking the total to $8,600. The $7,500 limit is the total across all your traditional and Roth IRAs, not $7,500 per account, and it cannot exceed your taxable compensation for the year if that is lower. The gap is the first big difference: a 401(k) lets you put in more than three times as much of your own money as an IRA. But the 401(k) depends on your employer offering one, while anyone with earned income can open an IRA, subject to the income limits below.
Who can use a Roth IRA: the 2026 income limits
A 401(k) has no income limit for the employee’s own contributions. A Roth IRA does. For 2026, the IRS phase-out range is $153,000 to $168,000 of modified adjusted gross income (MAGI) for single filers and heads of household, up from $150,000 to $165,000 in 2025. For married couples filing jointly, it is $242,000 to $252,000, up from $236,000 to $246,000. Inside the range, the amount you can contribute shrinks on a sliding scale; at or above the top, you cannot contribute directly to a Roth IRA for that year. For a married person filing a separate return who lived with their spouse at any time during the year, the range remains $0 to $10,000. For traditional IRAs, if you or your spouse is covered by a plan at work, the tax deduction may be reduced by income: for 2026, the phase-out is $81,000 to $91,000 for a single taxpayer covered by a workplace plan, and $129,000 to $149,000 for married couples filing jointly where the contributing spouse is covered. If neither spouse is covered, those phase-outs do not apply.
Tax now or tax later
Think of the choice as a bet on tax rates. If your rate in retirement will be lower than today — for example, because you expect a much smaller income once you stop working — paying tax later, through a traditional 401(k), may work out better. If your rate in retirement will be higher — because you are early in your career on a modest salary and expect earnings to rise — paying tax now through a Roth IRA may work out better, because you lock in today’s lower rate. A traditional 401(k) also lowers your taxable income in the year you contribute, which people in a high bracket now often value. A Roth IRA gives no break that year, but the benefit arrives later.
The employer match, investment choice and fees
If your employer offers a match, the 401(k) usually comes first, because the match is extra money no IRA can offer. Contributing at least enough to get the full match is the step most financial educators point to first. After the full match, the choice between extra 401(k) money and a Roth IRA is closer, and depends on fees, investment choice, income and tax. Some 401(k) plans also offer a Roth option — a Roth 401(k) — combining the higher 401(k) limit with Roth tax treatment. A 401(k) limits you to the plan’s investment menu, often mutual funds including target-date funds. A Roth IRA generally offers a wider range: shares, bonds, exchange-traded funds and many funds. That freedom helps only if you choose sensibly; many beginners do better with a simple, diversified fund. Our explainer on index funds sets out how a fund tracking a broad market index works. Fees compound over decades, so read your 401(k) fee disclosure and compare it with IRA fund fees. Money in either account is meant for retirement, and early withdrawal can trigger tax and, in many cases, an additional penalty.
Which is better in 2026?
There is no single winner, but there is a sensible order of questions. First, does your employer offer a 401(k) with a match? If so, contribute enough to get the full match. Second, what is your income? Above the Roth phase-out range, you cannot contribute directly to a Roth IRA at all. Third, what is your tax rate now compared with later? A lower rate now points towards Roth; a higher rate now points towards a traditional 401(k). Fourth, how much do you want to save? Above $7,500 a year, the IRA alone cannot hold it. Fifth, how much do you value choice and low fees? If your 401(k) menu is expensive or narrow, an IRA may be the better home for money beyond the match. For many people the answer in 2026 is both: a 401(k) up to the full match, then a Roth IRA up to its limit if income allows, then more into the 401(k) if there is still money to save.
Common mistakes to avoid
The most common mistake is contributing to a Roth IRA without checking the income limit, and discovering the problem at tax time. The second is assuming the $7,500 IRA limit is per account, when it is the total across all IRAs. The third is contributing too little to capture the full employer match. The fourth is treating a 401(k) or IRA as an investment itself, rather than an account that holds investments. The fifth is withdrawing retirement money early for a short-term expense without checking the tax and penalty consequences.
The bottom line
In 2026, the 401(k) wins on contribution room — $24,500 against the IRA’s $7,500, with catch-ups of $8,000 and $1,100 respectively — and on the employer match. The Roth IRA wins on tax treatment in retirement, on investment choice, and on freedom from any employer’s plan menu. Which is better for you depends on your income, your employer’s plan, and whether you expect your tax rate to be higher now or later. Work through the questions in order, check the IRS limits for your own filing status, and keep the money invested for the long term.
Educational only, not personal financial, tax or investment advice. Check current IRS guidance or speak to a qualified tax professional before deciding.