Can I Have a Solo 401(k) and a Traditional IRA at the Same Time?

Guides · Updated October 2026

A reader emailed me this one last week: she is self employed, opened a solo 401(k) this year, and her old traditional IRA is sitting at a brokerage gathering dust. "Can I keep contributing to both, or does the solo 401(k) kill the IRA?" The short answer is yes, you can have both, and the contribution limits do not interfere with each other at all. The longer answer, the one that actually affects her taxes, is about the word deductible.

Yes, you can contribute to both in the same year

This is the part people expect to be complicated and is not. A solo 401(k) and a traditional IRA are separate account types with separate IRS limits. For 2026, you can contribute up to $24,500 to your solo 401(k) as employee deferrals, plus employer profit sharing up to the $72,000 total cap, and separately contribute up to $7,500 to a traditional or Roth IRA if you are under 50 ($8,600 if you are 50 or older). Contributing the maximum to one does not reduce what you can put in the other.

The only hard requirement for the IRA side is taxable compensation. Your IRA contribution cannot exceed what you earned, and if your self-employment net earnings are very low, large solo 401(k) contributions can theoretically consume all of it, leaving nothing to support an IRA contribution. For anyone earning enough to be asking this question, that edge case does not apply.

Account	2026 limit (under 50)	Affected by the other?
Solo 401(k) employee deferral	$24,500	No
Solo 401(k) total (deferral + employer)	$72,000	No
Traditional / Roth IRA	$7,500	No

The catch: your solo 401(k) phases out the IRA deduction

Here is the part that actually matters. The IRS considers anyone with a solo 401(k) to be "covered by an employer retirement plan." That label does not limit your IRA contributions, but it does phase out your ability to deduct traditional IRA contributions, based on your modified adjusted gross income.

For 2026, the traditional IRA deduction phases out between $81,000 and $91,000 of MAGI for single filers, and between $129,000 and $149,000 for married couples filing jointly. Above the top of the range, your traditional IRA contribution is not deductible at all. You can still make it, it just goes in after tax and grows tax deferred, which is a much weaker deal than most people assume they are getting.

The decision rule I give people: if your MAGI is comfortably below the phaseout, contribute to the traditional IRA and take the deduction. If you are inside or above the phaseout, stop funding the traditional IRA and fund a Roth IRA instead, assuming you are under the Roth income limits. A nondeductible traditional IRA contribution is almost never the right answer when a Roth is available.

When the Roth IRA is the better second account

For self-employed people with good income, the most common winning combination I see is: max the solo 401(k) first for its huge contribution room, then put the IRA money into a Roth. The Roth IRA has its own 2026 income limits, $153,000 to $168,000 for single filers and $242,000 to $252,000 for married filing jointly, but the solo 401(k) does not make Roth contributions any less valuable. You get tax-free growth and tax-free withdrawals in retirement, which pairs nicely with the pre-tax solo 401(k) money you will pay ordinary income tax on later.

One more wrinkle worth knowing: if you also have a W-2 job with a 401(k), your $24,500 employee deferral is shared across all your 401(k) plans, as I covered in the W-2 and solo 401(k) guide. The IRA limit stays separate regardless. And if you are weighing the solo 401(k) against a SEP IRA in the first place, you can technically hold both of those too, though one usually wins, see the S-corp breakdown for the math.

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Frequently asked questions

Can I have a solo 401(k) and a traditional IRA at the same time?

Yes. You can contribute to both in the same year. The solo 401(k) and IRA contribution limits are completely separate: for 2026 you can put up to $24,500 into a solo 401(k) as employee deferrals and still contribute up to $7,500 to an IRA.

Is my traditional IRA contribution deductible if I have a solo 401(k)?

Not necessarily. Having a solo 401(k) makes you covered by an employer retirement plan, which phases out the traditional IRA deduction. For 2026 the deduction phases out at $81,000 to $91,000 of modified AGI for single filers and $129,000 to $149,000 for married couples filing jointly.

Should I choose a Roth IRA instead if I have a solo 401(k)?

Often yes, if your income is above the traditional IRA deduction phaseout. A Roth IRA has its own income limits for 2026 ($153,000 to $168,000 single, $242,000 to $252,000 married filing jointly), but contributions are never deductible anyway, so the solo 401(k) coverage does not reduce their value.

Do I need separate earned income for the IRA contribution?

Your IRA contribution cannot exceed your taxable compensation. If your self-employment net earnings are very low and your solo 401(k) contributions consume all of them, there may be nothing left to support an IRA contribution. With typical earnings this is not an issue.

Can I max out a solo 401(k) and an IRA in the same year?

Yes, if your income supports it. For 2026 that means up to $24,500 in solo 401(k) employee deferrals plus employer profit sharing (total cap $72,000), and separately up to $7,500 in an IRA. One does not reduce the other.

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