Hiring Your Spouse in a Solo 401(k): The Double-Contribution Rules

Q: Can I hire my spouse in my solo 401(k)?

Yes. A spouse is the one exception to the solo 401(k) no-employees rule. If your spouse does genuine work for the business and is paid reasonable compensation, they can participate as an employee with their own $24,500 deferral limit and employer contribution bucket in 2026.

Q: How much can a married couple contribute to a solo 401(k) in 2026?

Up to $144,000 total: each spouse gets their own $24,500 employee deferral limit and their own $72,000 total-additions cap. A realistic couple with $100,000 and $60,000 salaries shelters about $89,000 across deferrals and profit-sharing.

Q: Do I need to file Form 5500 for a solo 401(k) with my spouse?

You must file Form 5500-SF once plan assets reach $250,000, which happens sooner when two people contribute. The spouse does not trigger any additional filing on their own; the $250,000 threshold applies to the whole plan.

Q: Can I do the same thing with a SEP IRA?

A SEP IRA can cover an employed spouse too, but the advantage is smaller: the SEP has no employee deferral component, so the couple only gets the 25%-of-pay employer contribution on the spouse's earnings. The solo 401(k) doubles the deferral, which is where most of the extra savings live.

Guides · Updated October 2026

The math that ends the conversation: a married couple can shelter up to $144,000 in a solo 401(k) in 2026, against $72,000 for one person. Not because of any loophole. Because the IRS lets you hire your spouse in your solo 401(k), and your spouse is the single exception to the no-employees rule that defines the plan. If both of you already work in the business, half the strategy below is paperwork.

Can you hire your spouse in a solo 401(k)? The short answer

Yes. A solo 401(k) is for a business with no full-time employees, but a spouse who works in the business is not counted as an employee for this purpose. They can participate as an employee with their own $24,500 employee deferral limit and their own $72,000 total-additions cap in 2026. Everything doubles: the deferral, the employer contribution, the tax shelter.

The part that kills the strategy for most people is the word hire. Your spouse has to be an actual employee. Three requirements, all enforced:

Genuine work. Real duties, real hours. Bookkeeping, client intake, billing, marketing, project work: the tasks have to exist and be done.
Reasonable compensation. Paid for that work at a rate the business could defend to a stranger. In an S-corp that means W-2 wages; in a sole proprietorship it means net self-employment earnings from the business.
A plan document that allows it. Most solo 401(k) documents include spouse participation, but you should confirm yours does before you start contributing in their name.

What you cannot do is fund your spouse's contributions out of your own account and label it theirs. The contributions have to come from the spouse's compensation. No compensation, no contribution. That sentence is the whole compliance section.

The math: an $89,000 couple's example

Take a married couple running a graphic design studio as an S-corp. He is the lead designer on a $100,000 W-2 salary; she handles client intake and billing on a $60,000 W-2 salary. Run each spouse through both sides of the plan:

His employee deferral (2026 limit)	$24,500
Her employee deferral (2026 limit)	$24,500
Employer contribution, 25% of $100,000	$25,000
Employer contribution, 25% of $60,000	$15,000
Household total sheltered	$89,000

Against a single earner sheltering roughly $49,500 on the same $100,000 salary, the second $24,500 deferral is doing most of the work. The employer side is nice, but the doubled employee deferral is the reason this strategy beats everything else available to a two-person business.

The Form 5500 threshold. Once plan assets reach $250,000 you must file Form 5500-SF with the IRS each year. Two people contributing full freight can hit that threshold in two to three years, well before a single earner would. It is a simple annual filing, but it is the most common compliance surprise for couples, because nobody tells them the doubling cuts the timeline in half too.

Why this tips the solo 401(k) vs SEP IRA choice

This is where the spouse play becomes a plan-selection argument, not just a savings tactic. A SEP IRA can also cover an employed spouse, but the SEP has no employee deferral component at all. With a SEP, the spouse's participation buys you only the 25%-of-pay employer contribution on their earnings: on a $60,000 salary, $15,000, and nothing more.

The solo 401(k) doubles the $24,500 employee deferral, which is the biggest lever in either plan. For a working couple, the solo 401(k) advantage over the SEP grows from meaningful to decisive. Run the comparison with your own incomes and the difference usually lands between $24,500 and $49,000 a year.

What happens when the spouse stops working

Life changes the math. If your spouse steps back from the business to raise kids or take another job, new contributions for them stop the day the compensation stops. The existing balance stays in the plan, keeps growing, and can be rolled to an IRA or a new employer's plan whenever they want. Nothing is forfeited; the contribution door just closes until the work resumes. Plan documents do not care about the future, only about the year the money went in.

Choosing between a solo 401(k) and a SEP IRA?

Run your own income through both plans and see the difference.

Run your own numbers with the free calculator

Frequently asked questions

Can I hire my spouse in my solo 401(k)?

Yes. A spouse who works in the business is the one exception to the solo 401(k) no-employees rule. They participate as an employee with their own $24,500 deferral limit and $72,000 total cap in 2026. The work must be genuine and paid at reasonable compensation.

Does my spouse need a W-2 salary from the business?

Your spouse needs real compensation from the business: W-2 wages in an S-corp, or net self-employment earnings in a sole proprietorship. You cannot fund their contributions from your own account. No compensation means no contribution.

How much can a married couple contribute to a solo 401(k) in 2026?

Up to $144,000: each spouse gets their own $24,500 employee deferral and their own $72,000 total-additions cap. A couple with $100,000 and $60,000 W-2 salaries realistically shelters about $89,000.

Do I need to file Form 5500 for a solo 401(k) with my spouse?

Form 5500-SF is required once the plan holds $250,000 in assets, and two contributors reach that threshold faster than one. The spouse does not trigger extra filings beyond the single plan-level return.

Can I do the same thing with a SEP IRA?

A SEP can cover an employed spouse, but only through the employer contribution of up to 25% of pay. There is no employee deferral in a SEP, so the couple misses the doubled $24,500 deferral that makes the solo 401(k) version powerful.

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