Solo 401k Eligibility

1. Self-Employed Individuals

• You must have earned income from a trade or business in which you operate as the owner (or sole proprietor).
• This includes freelancers, consultants, independent contractors, and "gig" workers.

2. Small-Business Owners With No Employees

• Your business can't have any full-time employees (other than a spouse).
• "Full-time" generally means working 1,000 or more hours per year.

3. Spouse Employees

• If your spouse works in your business, they can also participate in the plan, effectively doubling household contributions.
• No non-spouse, full-time employees are allowed if you want to maintain Solo 401k status.

Sole Proprietorship

Operate under your personal name or a "doing business as" (DBA).

Single-Member LLC

The LLC is taxed as a disregarded entity (i.e., similar to a sole proprietor).

Multi-Member LLC or Partnership

Each partner/LLC member can open their own Solo 401k if they have no employees under them (other than a spouse).

Often more complex—consult with a CPA or financial advisor.

S-Corporation

You pay yourself a salary (W-2), and your Solo 401k contributions are based on that salary.

C-Corporation

Less common, but still possible, provided you and your spouse are the only employees.

No-employee rule

A Solo 401k requires no non-spouse full-time employees. A SEP-IRA allows employees, but you'd be required to make proportionally equal contributions for every eligible employee — which can quickly become costly.

Roth option

Solo 401ks support Roth contributions and in-plan Roth conversions. Traditional SEP-IRAs are pre-tax only (Roth SEP-IRAs were authorized by SECURE 2.0 but provider support remains limited).

Catch-up contributions

Solo 401k participants 50+ can make catch-up contributions; SEP-IRAs do not allow catch-ups at all.

Loans

Solo 401ks can permit participant loans (up to 50% of the balance, capped at $50,000). SEP-IRAs do not allow loans.

Deadline to set up

SECURE Act Section 201 lets you adopt a Solo 401k as late as your tax filing deadline (including extensions) and still make employer contributions for the prior year. SEP-IRAs have similar deadlines.

1. What if I have a side gig in addition to my regular job?

If you're employed full-time by someone else (and possibly covered by their 401k plan), you can still open a Solo 401k for your side business. However, your total contributions across all employer plans (including the Solo 401k) must stay within IRS annual limits.

2. Can I hire independent contractors without losing Solo 401k eligibility?

Yes. Independent contractors (paid via 1099) are not considered W-2 employees. As long as you do not bring on a W-2 employee who works 1,000+ hours per year, you generally remain eligible.

3. If I have part-time or seasonal employees, am I still eligible?

Potentially. It depends on how many hours they work and other factors (like how many years they've worked for you). Under current rules, employees must typically work at least 1,000 hours per year for you to be required to offer them participation in a 401k. Consult your provider to clarify the specifics, as IRS regulations can change.

4. What if my spouse works in the business?

That's allowed. Your spouse can contribute to the same Solo 401k plan, often doubling total contributions. You'll need to ensure they receive legitimate compensation from the business (i.e., they're on payroll or otherwise have earned income).

5. What if I hire a non-spouse employee later?

If you hire a full-time W-2 employee who's not your spouse, you'll generally need to transition from a Solo 401k to a regular 401k plan that includes coverage for your new employee(s). There may be a grace period, depending on the plan rules and how quickly your employee becomes eligible, but be prepared to update your retirement plan accordingly.

Who qualifies for a Solo 401k?

You qualify for a Solo 401k if you have self-employment income from a trade or business and have no full-time W-2 employees other than your spouse. 'Full-time' generally means working 1,000 or more hours per year. The rule applies whether you operate as a sole proprietor, single-member LLC, multi-member LLC, partnership, S-Corp, or C-Corp — the entity type doesn't matter as much as the no-non-spouse-employees test.

Who can open a Solo 401k?

Any self-employed individual or business owner without non-spouse W-2 employees can open a Solo 401k. That includes freelancers, consultants, independent contractors (1099 workers), gig workers, real estate agents, and small-business owners. You need actual earned income from self-employment — passive income (rentals, dividends) on its own does not qualify. There is no income minimum, but your contributions can't exceed your compensation.

Can a sole proprietor open a Solo 401k?

Yes. Sole proprietors are one of the most common Solo 401k participants. As a sole proprietor, your contributions are based on net self-employment income — your Schedule C profit minus the deductible half of self-employment tax. You can contribute up to the employee deferral limit ($24,500 in 2026) plus up to 20% of net self-employment income as the employer profit-sharing portion.

Can independent contractors open a Solo 401k?

Yes. Independent contractors (people who receive 1099-NEC income) qualify as long as they don't have non-spouse W-2 employees. Most 1099 contractors operate as sole proprietors or single-member LLCs and use those entities to sponsor the Solo 401k. If you have a W-2 day job and also do 1099 contract work on the side, you can open a Solo 401k for your contracting business — though your employee deferrals are aggregated across all 401k plans you participate in.

Do I need an EIN to open a Solo 401k?

Yes. The IRS requires a unique Employer Identification Number (EIN) to establish a Solo 401k, even if you're a sole proprietor who normally files under your Social Security Number. You cannot use your SSN as the plan's tax ID. EINs are free to obtain — apply online at IRS.gov and you'll get one immediately. Some Solo 401k providers will help walk you through the EIN application during account opening.

Can I have a Solo 401k and a regular 401k at the same time?

Yes. If you have a W-2 day job with an employer-sponsored 401k and also self-employed income on the side, you can participate in both plans. The employee deferral limit ($24,500 in 2026) is shared across all 401k plans, so deferrals at your day job reduce how much you can defer into the Solo 401k. However, the employer-side profit-sharing contribution is calculated per plan, so your self-employed business can still make a separate profit-sharing contribution up to the per-plan total annual additions limit.

Does my spouse qualify for my Solo 401k?

Yes — and this is one of the biggest advantages of a Solo 401k. If your spouse legitimately works in your business and is paid (W-2 wages or earned income from the business), they can participate in the same Solo 401k plan as a separate participant, contributing up to the full annual limits in their own name. This effectively doubles your household's potential contributions.

What's the difference between Solo 401k and SEP-IRA eligibility?

Both are designed for self-employed individuals, but the eligibility rules are stricter for a Solo 401k in one specific way: a Solo 401k requires you to have no full-time non-spouse employees. A SEP-IRA, by contrast, allows employees, but requires you to make proportional contributions for them — which becomes expensive quickly. If you're truly solo (or only employ a spouse), a Solo 401k is almost always the better choice because of higher contribution limits, the option to make Roth contributions, and the loan provision.

1. Verify Your Business Status

• Make sure your business formation and any employees are correctly classified.
• Confirm you meet the "no non-spouse full-time employee" rule.

2. Choose a Solo 401k Provider

If you're eligible, check out our Provider Comparisons to find a Solo 401k solution that fits your needs.

3. Review Contribution Limits

Visit our Contribution Limits page to learn how much you can set aside each year, or run your own numbers with the Solo 401k Contribution Calculator.

4. Consult an Expert

If you have questions about your unique situation—especially if you have a multi-member LLC, partnership, or plan to hire employees—consider talking to a CPA or financial advisor.

Your go-to overview of Solo 401ks, covering plan features, benefits, and how they differ from other retirement plans.

Dive into more detailed questions about specific Solo 401k scenarios, from rollovers to in-plan Roth conversions.