After-tax 401(k) contributions for high earners

What if you’ve contributed the maximum amount of pre-tax (or Roth) dollars to your employer-sponsored 401(k) plan, but you still want to grow this fund for retirement? After-tax 401(k) contributions may allow you to contribute additional post-tax dollars to your workplace retirement plan.

“In some cases, it’s possible to make after-tax 401(k) contributions beyond and outside of your pre-tax and/or Roth 401(k) contributions and employer match,” says David Britton, Senior Wealth Planner with U.S. Bank Private Wealth Management. “These contributions can be an opportunity for high earners to further grow their retirement savings.”

What is an after-tax 401(k) contribution?

After-tax 401(k) contributions, sometimes referred to as post-tax 401(k) contributions, are post-tax dollars you invest in an employer-sponsored 401(k) plan above and beyond your annual effective deferral limit.

Because the money you invest has already been taxed, your contributions can be withdrawn tax-free. Earnings grow tax-deferred, similar to a Roth 401(k). But unlike a Roth 401(k), where qualified distributions aren’t subject to income tax, earnings on after-tax 401(k) contributions are generally taxed as ordinary income when you withdraw them, unless they’re rolled into a Roth IRA.

Not all workplace retirement plans allow after-tax 401(k) contributions, but a growing number do. This can create an opportunity for high earners to put more money toward retirement in a tax-efficient way.

How do after-tax 401(k) contributions work?

The annual elective deferral limit for an individual’s pre-tax 401(k) contributions or Roth 401(k) contributions is $24,500 in 2026. If you’re age 50-59 or 64 and older, you can add an extra $8,000 in catch-up contributions. Note that due to a provision in the Secure 2.0 Act, employees age 60-63 can contribute up to $11,250 in catch-up contributions in 2026.

If your employer’s retirement plan allows after-tax 401(k) contributions, it brings the total allowed contribution, including employer match, to $72,000 in 2026, plus more for those 50 or over.   

What are the after-tax 401(k) withdrawal rules?

One benefit of after-tax contributions to your workplace 401(k) is that you may be able to withdraw your contributions without tax or penalties. However, any earnings on those after-tax contributions are considered pre-tax. You’ll generally owe tax if you withdraw earnings unless you roll them over into an IRA. If you’re not yet 59 ½, you might also have to pay a 10% penalty on the earnings. 

What’s more, the option to make after-tax contributions within an employer-sponsored 401(k) plan does not have an income limit. Regardless of what you earn, you can participate if your employer offers the plan.

Withdrawal rules vary from plan to plan. For example, you might not be able to take withdrawals until you leave your employer. If your employer’s plan does allow withdrawals, the rules can be complicated, so it’s a good idea to consult a financial professional to make sure you understand the implications. 

What are benefits of after-tax 401(k) contributions?

After-tax 401(k) contributions offer high earners a path to save more once they've maxed out pre-tax and Roth options, with features that include higher contribution limits, tax-flexible rollover options, and greater control over long-term retirement income.

• No income limit. Unlike a Roth IRA, there's no income threshold to participate. If your employer's plan allows it, you're eligible regardless of what you earn.

• Flexible access to contributions. Depending on your plan’s rules, you may be able to withdraw after-tax contributions without tax or penalties, a level of flexibility most other retirement vehicles don't offer.

• Roth IRA rollover opportunity. When you leave your employer, you can roll after-tax contributions directly into a Roth IRA, where future growth and qualified withdrawals can remain tax-free.

• Tax-deferred growth on earnings. Any earnings on after-tax contributions can roll into a traditional IRA, preserving continued tax-deferred growth until retirement.

• Greater tax diversification. For high earners who've already fully funded pre-tax and Roth 401(k) options, after-tax contributions can support a broader, more tax-efficient retirement strategy.

How can you make the most of after-tax 401(k) contributions?

Even if your employer offers this option, it won’t be right for everyone. Here’s what you should know about taking advantage of after-tax 401(k) contributions.

When should you make after-tax 401(k) contributions?

Consider making after-tax 401(k) contributions after maxing out your traditional or Roth 401(k) accounts. They may offer more favorable tax treatment, depending on your circumstances.

You aren’t required to wait until you’ve hit your annual elective deferral limit, but it’s important to make sure any after-tax contributions you make don’t stop you from investing the full allowable amount in pre-tax or Roth accounts.   

How do you invest after-tax contributions? Three paths to consider

1. Keep the money where it is. You could keep your after-tax contributions in your employer 401(k) and simply pay tax on the earnings when you withdraw them. Not all workplace plans will let you make withdrawals until you leave the company or retire, so be sure to understand both IRS rules and those of your workplace plan.
2. Move contributions to a Roth account. You can roll over your after-tax contributions to a Roth IRA, if your employer’s plan allows it, and enjoy tax-free withdrawals during retirement. “Within the Roth IRA, the subsequent earnings on those funds remain tax-free,” says Britton, “as long as the withdrawals take place after you reach 59 1/2 years and after reaching the five-year holding period.”
3. Move earnings to a traditional IRA. “Earnings on after-tax contributions will need to be rolled over to a traditional IRA, because they haven’t yet been taxed,” Britton says. This allows you to defer paying taxes on traditional IRA withdrawals until retirement.

Roth 401(k) vs. after-tax 401(k): What's the difference?

The key difference is timing of taxation. Roth 401(k) contributions are taxed going in but aren’t taxed again when withdrawals are qualified. After-tax 401(k) contributions are also taxed going in, but earnings are generally taxed as ordinary income when withdrawn unless rolled into a Roth IRA. Roth 401(k) contributions tend to work best for savers who haven't yet maxed out their elective deferral limit, while after-tax contributions may work best for high earners looking to invest beyond that limit.

If you decide to roll over your after-tax contributions to a Roth IRA, there is a way around the five-year withdrawal waiting period. While you can’t open a Roth IRA directly if your income is too high, you can open a traditional IRA and then immediately convert a nominal amount, say $1,000 or even $100, to a Roth IRA, which will start the five-year clock. This is called a backdoor Roth IRA. Be sure to consult with your tax professional to discuss the backdoor Roth IRA strategy, including “basis aggregation rules” that may exist.

What are the tax implications of after-tax 401(k) contributions?

The most important thing to remember about after-tax contributions to an employer-sponsored 401(k) is that your contributions have already been taxed, but earnings are taxed at ordinary income rates when you withdraw them, unless they’re rolled to a Roth IRA.

Whether you leave after-tax funds in your employer’s plan or roll them over to a Roth IRA or a traditional IRA should depend on your overall tax strategy, your timeline, and your retirement plan.

“That’s really the first question that should be asked: What's the need for that dollar once it's invested? And then you can decide where to put it in the most tax-efficient manner,” Britton says.

You should consult a tax professional before making after-tax 401(k) contributions to make sure this tactic fits in with your overall financial strategy.

Are after-tax 401(k) contributions right for you?

The strongest case for making after-tax contributions to your 401(k) plan, according to Britton, is to maximize the tax-advantaged Roth IRA provisions within the tax code.

“Making after-tax contributions into your 401(k) to be later rolled over into a Roth IRA would be a great strategy for you to put more money away now so you can maximize a tax-efficient retirement bucket later.”

Learn how we can help you build a strategy to grow and protect your wealth. 

Frequently asked questions

Can you make both Roth 401(k) and after-tax 401(k) contributions in the same year?

Yes. Many plans that offer after-tax contributions let you contribute to a Roth 401(k) up to the elective deferral limit first, then add after-tax contributions on top of that, up to the combined $72,000 2026 limit.

Is a 401(k) pre-tax or after-tax?

A 401(k) can include both pre-tax and after-tax contributions, depending on which options your employer's plan offers. Traditional 401(k) contributions are pre-tax, Roth 401(k) contributions are after-tax but grow tax-free, and some plans also allow separate after-tax contributions beyond the elective deferral limit.

Do after-tax 401(k) contributions count toward the IRS elective deferral limit?

No. After-tax contributions fall outside the $24,500 elective deferral limit for 2026 and instead count toward the higher combined limit that includes employer match and all contribution types.

What happens to after-tax 401(k) contributions if you change jobs?

You can typically roll over after-tax contributions to a Roth IRA and any related earnings to a traditional IRA, letting both continue to grow according to their respective tax treatments. Check your plan's specific rollover rules before you leave your employer.

Do employer matching contributions count toward the $72,000 2026 limit?

Yes. The $72,000 combined limit for 2026 includes your elective deferral contributions, your after-tax contributions, and your employer's matching or profit-sharing contributions, all together.

Can you make after-tax 401(k) contributions if your employer doesn't offer a Roth 401(k)?

Yes. After-tax 401(k) contributions and Roth 401(k) contributions are separate plan features, so your employer could offer one without the other. Check your plan documents to confirm which options are available to you.