For most people, a 401(k) and a Roth IRA are not an either-or. The usual order is: fund the 401(k) up to your employer match, then a Roth IRA if you are eligible, then back to the 401(k) until you hit its limit. Both are retirement accounts with tax advantages; what separates them is when you get the tax break and how you access the money.

A 401(k) takes contributions pre-tax, straight from your paycheck before income tax. That lowers your taxable income now, and you pay ordinary income tax on withdrawals in retirement. It is offered through your employer, often with a match.

A Roth IRA takes after-tax dollars. No deduction now, but qualified withdrawals in retirement, including all the investment growth, are tax-free. You open it yourself at a broker, and it is not tied to any job.

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What is a 401(k)?

A 401(k) is an employer-sponsored retirement account that lets you divert part of each paycheck into investments for retirement. The standard version is pre-tax; a Roth 401(k), if your employer offers one, takes after-tax contributions instead.

Its main advantage over an IRA is the contribution limit. For 2026, you can contribute up to $24,500 of your own pay to a 401(k), plus an $8,000 catch-up at 50 or older, or $11,250 if you are between 60 and 63. A Roth IRA’s 2026 limit is $7,500, plus a $1,100 catch-up at 50 or older.

What is a Roth IRA?

A Roth IRA is an individual retirement account you fund with money you have already paid tax on, so qualified withdrawals in retirement are entirely tax-free. You open and manage it yourself, which usually means a wider set of investment choices than a 401(k)'s fund menu.

The tradeoff is income limits. Earn above a certain level and your allowed contribution shrinks, then disappears. That makes a Roth IRA a natural fit for low- and moderate-income earners, and for anyone who expects to be in the same or a higher tax bracket in retirement. High earners can still get in through a backdoor Roth conversion.

If you are unsure which to prioritize, a financial advisor can weigh the two against your tax situation now and your expected income later.

Key Differences

Beyond the timing of the tax break, your income determines how usable each account is. A 401(k) has no income limit. A Roth IRA does: for 2026, you cannot contribute directly once modified adjusted gross income (MAGI) reaches $168,000 as a single filer or $252,000 as a married couple filing jointly.

Just below those cutoffs, your contribution is reduced. The 2026 Roth IRA phase-out ranges are:

• $153,000 to $168,000 for single filers and heads of household
• $242,000 to $252,000 for married couples filing jointly

If your MAGI lands in those ranges, a traditional or Roth 401(k), which has no income restriction, is often the simpler way to keep saving at full strength.

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Final Thoughts

The choice depends on your income, your current versus expected tax bracket, and your goals. A 401(k) brings higher limits and an employer match; a Roth IRA brings tax-free growth and more flexibility, including no required minimum distributions and penalty-free access to your contributions before retirement. Using both over a career also builds a mix of taxable and tax-free income to draw on later.

A Certified Financial Planner can look at your income, your employer’s plan, and your retirement timeline and tell you where each dollar should go first.

Frequently asked questions

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

The main difference is when you pay tax. A traditional 401(k) uses pre-tax dollars and taxes your withdrawals in retirement. A Roth IRA uses after-tax dollars, so you get no deduction now, but qualified withdrawals in retirement are tax-free. A 401(k) also comes from your employer and may include a match; a Roth IRA you open yourself.

Can I contribute to both a 401(k) and a Roth IRA?

Yes. You can fund both in the same year, as long as your income is within the Roth IRA limits. For 2026, direct Roth IRA contributions phase out between $153,000 and $168,000 of MAGI for single filers and between $242,000 and $252,000 for joint filers. A 401(k) has no income limit.

What are the 2026 contribution limits for a 401(k) and a Roth IRA?

For 2026, the 401(k) employee limit is $24,500, plus an $8,000 catch-up at 50 or older, or $11,250 for ages 60 to 63. The Roth IRA limit is $7,500, plus a $1,100 catch-up at 50 or older. Both figures are adjusted by the IRS most years.

Are there income limits for contributing to a 401(k) and Roth IRA?

There are no income limits on 401(k) contributions. Roth IRA contributions phase out over income ranges that the IRS raises most years: for 2026, $153,000 to $168,000 for single filers and $242,000 to $252,000 for married couples filing jointly. Above the top of the range, you cannot contribute directly.

How do withdrawals work for each account?

A 401(k) withdrawal is taxed as ordinary income, and taking money out before age 59 1/2 usually adds a 10% penalty. Roth IRA contributions can be withdrawn tax- and penalty-free at any time; the earnings are tax-free once the account is at least five years old and you are 59 1/2 or older, or you meet another qualifying condition.

What about employer matching contributions?

Many 401(k) plans match part of what you contribute, which is an immediate return on your money. A Roth IRA is individual and has no match, which is why capturing the full 401(k) match usually comes before funding a Roth IRA.

Which is better for tax savings?

It depends on your tax bracket now versus in retirement. Expect a higher bracket later, and a Roth IRA’s tax-free withdrawals win. Expect a lower bracket later, and a traditional 401(k)'s upfront deduction is worth more.

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

Yes. Rolling a pre-tax 401(k) into a Roth IRA is a Roth conversion, and you owe income tax on the full amount converted in that year. Rolling a Roth 401(k) into a Roth IRA is not taxable, since both are already after-tax.

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