Can an employee open a solo 401(k)?

What a solo 401(k) actually requires

A solo 401(k) is a 401(k) for a business that employs only the owner (and optionally a spouse). The IRS calls it a one-participant plan and defines it as a plan that "covers a business owner with no employees, or that person and his or her spouse." Two conditions have to be true:

• You have self-employment income. That means net earnings from a business you own: sole proprietorship, partnership, LLC, or corporation. Wages reported on a W-2 from an employer are not self-employment income.
• You have no full-time employees. Other than you and a working spouse, the business cannot have a common-law employee who works 1,000+ hours a year. Independent contractors on a 1099 do not count as employees for this test.

The whole design of the account assumes you are wearing two hats at your own business: the "employee" who defers salary and the "employer" who makes a profit-sharing contribution. A regular job gives you only one of those hats, and it belongs to your employer's plan, not to a plan of your own.

Why being an employee does not count

People assume that because a solo 401(k) has "individual" in the name, any individual can open one. The name refers to the business having a single participant, not to you personally being allowed to set one up. Without self-employment income there is no business to sponsor the plan and no earned self-employment base to contribute from. So a high salary at someone else's company, on its own, gives you nothing to build a solo 401(k) on.

This is exactly the trap to avoid if your employer's 401(k) was shut down and you are wondering where to put the money. You cannot spin up a solo 401(k) just to receive that rollover. If you have no side business, your destination is a rollover IRA. We cover that decision in your employer shut down the 401(k): what are your options?

The mix-up: receiving a rollover vs being eligible to open one

Two different things get blurred here:

• Receiving old 401(k) money. Anyone can roll a former 401(k) into a traditional IRA. That is a rollover, and it needs no self-employment income.
• Opening a solo 401(k) to receive it. This needs self-employment income, because you are creating a new employer plan, and only a business can sponsor one.

So "I will open an individual 401(k) and roll my old plan into it" only works if you already qualify to open the individual 401(k) in the first place. If you do not, the same money goes into a rollover IRA just as easily, with no eligibility test.

What you can do as an employee instead

If you are a W-2 employee with no business of your own, you have two solid tools:

• Your workplace 401(k), if your employer offers one. Contribute at least enough to capture any employer match; that match is an immediate return you cannot get anywhere else.
• An IRA, traditional or Roth, which you open yourself at any brokerage. For 2026 you can contribute up to $7,500, or $8,600 if you are 50 or older, across all your IRAs combined.

A traditional IRA contribution may be tax-deductible, which is the "money back at tax time" people are usually after; a Roth IRA contribution is not deductible but is tax-free in retirement. Which one is deductible for you depends on your income and workplace-plan coverage, laid out in the deduction table on our terminated 401(k) options page. To open one, see how to open a Roth IRA.

What if you have a side business?

This is the one case where an employee can also have a solo 401(k). If you hold a W-2 job and run a side business (freelancing, consulting, a 1099 gig, an LLC), the side business can sponsor a solo 401(k) on its own self-employment income. You would then have two plans at once, and the limits interact:

• The employee salary-deferral limit is shared across all 401(k)s. For 2026 that is $24,500 total ($33,000 if you make the age-50 catch-up), whether it goes to your job's plan, your solo 401(k), or a split between them. It is one bucket, not one per plan.
• The employer profit-sharing side is separate per business. Your solo 401(k) can still take an employer contribution from your self-employment profit, on top of whatever your day-job plan does, up to the overall $72,000 total-additions cap per employer for 2026.

So the honest version of the answer is: you cannot open a solo 401(k) as an employee, but you can open one as a business owner who also happens to have a job. The qualifying fact is the business, not the job. For how the contribution math works on the self-employed side, see solo 401(k) contribution limits, and if you own more than one business, check the solo 401(k) eligibility checker for the controlled-group rules.

The bottom line

A solo 401(k) is for business owners with no full-time employees, so a W-2 employee cannot open one on the strength of a salary alone. If that is you, use your workplace 401(k) and an IRA, and roll any old 401(k) into a rollover IRA rather than a solo plan. The moment you add real self-employment income, a side business or 1099 work, the door to a solo 401(k) opens, with the salary-deferral limit shared across all your 401(k)s. This is general information, not tax advice; confirm your own eligibility with the IRS page below or a qualified professional.