If you’re a freelancer or self-employed worker, choosing a Solo 401(k) over a SEP-IRA could save you $4,000 or more in taxes in 2026 — and most people are picking the wrong one. The Solo 401(k) lets you contribute as both an employee and an employer, dramatically increasing your deductible contributions at lower income levels. For most freelancers earning under $200,000, the Solo 401(k) is the clear winner. But the right answer depends on your income, your age, and how much paperwork you’re willing to handle.

What’s the difference between a Solo 401(k) and a SEP-IRA?

Both accounts are designed for self-employed people and small business owners with no full-time employees (other than a spouse). Both grow tax-deferred, meaning you don’t pay taxes on the money until you withdraw it in retirement. But the way you calculate your maximum contribution is very different.

A SEP-IRA (Simplified Employee Pension) lets you contribute up to 25% of your net self-employment income, capped at $70,000 in 2026. It’s dead simple to open — most brokerages set one up in minutes — and there’s almost no ongoing paperwork.

A Solo 401(k) (also called an Individual 401(k) or Self-Employed 401(k)) works in two layers. You can contribute up to $23,500 as the “employee” (that’s you wearing your worker hat), plus up to 25% of net self-employment income as the “employer” (that’s you wearing your boss hat). The combined limit is also $70,000. If you’re 50 or older, you get an extra $7,500 catch-up contribution on top of that.

Why does the Solo 401(k) win for most freelancers?

Here’s the $4,000 mistake hiding in plain sight. Say you’re a freelance designer who netted $80,000 in 2026.

  • With a SEP-IRA, you can contribute roughly $14,842 (25% of net self-employment income after the self-employment tax deduction).
  • With a Solo 401(k), you can contribute that same ~$14,842 as the employer portion — plus up to $23,500 as the employee portion. Total: about $38,342.

At a 22% federal tax bracket, the difference in deductions is roughly $5,170 in tax savings. That’s real money staying in your pocket — or better yet, compounding in your retirement account for the next 20 years.

The SEP-IRA only catches up to the Solo 401(k) at higher income levels (roughly $250,000+ in net self-employment earnings), because the 25% employer contribution eventually becomes large enough to max out the $70,000 annual limit on its own.

Who should still choose a SEP-IRA?

The SEP-IRA isn’t a bad plan — it’s just the wrong plan for most freelancers who aren’t maximizing it. It makes sense if:

  • You have part-time employees. A Solo 401(k) is only available to self-employed individuals with no full-time W-2 employees other than a spouse. If you hire help, the Solo 401(k) door closes.
  • You want zero administrative hassle. A Solo 401(k) requires a written plan document, and if your balance exceeds $250,000, you must file an annual Form 5500-EZ with the IRS. Not complicated, but it’s more than a SEP-IRA demands.
  • You earn a very high income. If your net self-employment income is high enough that 25% alone gets you near $70,000, the SEP-IRA is just as effective and simpler.

How do I open a Solo 401(k) before the deadline?

This is where people lose money every year: the account must be established by December 31 of the tax year you want to use it for. You can’t open a Solo 401(k) in April when filing your taxes and apply it retroactively (unlike a SEP-IRA, which you can open up until your tax filing deadline including extensions).

For 2026, your Solo 401(k) must be open by December 31, 2026. Employee contributions are due by your tax filing deadline. Employer contributions can be made up to the filing deadline including extensions.

Most major brokerages — Fidelity, Schwab, Vanguard, and E*TRADE — offer Solo 401(k) plans at no cost. Fidelity is popular because it allows contributions in both traditional (pre-tax) and Roth formats, giving you even more flexibility.

What about Roth contributions inside a Solo 401(k)?

This is one of the most underused features of the Solo 401(k). Unlike a SEP-IRA, which is always pre-tax (traditional), many Solo 401(k) plans let you designate some or all of your employee contributions as Roth. You pay taxes on that money now, but it grows completely tax-free and you won’t owe a penny in taxes when you withdraw it in retirement.

For freelancers who expect to be in a higher tax bracket later — or who simply want tax diversification — making Roth Solo 401(k) contributions alongside traditional pre-tax contributions is a powerful strategy.

How does this fit into a broader retirement plan for freelancers?

Choosing between a Solo 401(k) and SEP-IRA is just one piece of your retirement puzzle. Here’s a simple framework:

  1. Maximize your retirement account first. Every dollar you contribute reduces your taxable self-employment income today.
  2. Build a cash emergency fund separately. Retirement accounts should be last-resort funds. Aim for 3–6 months of expenses in a high-yield savings account before aggressively funding retirement accounts.
  3. Think about the 4% withdrawal rule. This rule of thumb suggests you can withdraw 4% of your portfolio annually in retirement without running out of money over 30 years. If you want $50,000 per year from investments, you need roughly $1.25 million saved. The earlier you start and the more you contribute, the closer you get.
  4. Diversify your investments inside the account. A low-cost target-date fund or a simple three-fund portfolio (U.S. stocks, international stocks, bonds) keeps things manageable without requiring constant attention.

Freelancing gives you income flexibility — your retirement account should give you tax flexibility to match.

FAQ

Frequently Asked Questions

Frequently Asked Questions

Frequently Asked Questions

Can I have both a Solo 401(k) and a SEP-IRA at the same time?

Technically yes, but your combined contributions across all plans cannot exceed the annual IRS limits ($70,000 in 2026, plus catch-up if you’re 50+). In practice, most freelancers choose one or the other to keep things simple. Having both adds complexity without adding extra contribution room.

What is the 4% withdrawal rule and does it still work in 2026?

The 4% rule suggests retirees can withdraw 4% of their savings in year one, then adjust for inflation each year, without running out of money over a 30-year retirement. It still works as a general guideline, but some financial planners now recommend 3.3%–3.5% given today’s longer life expectancies and market volatility. It’s a starting point, not a guarantee.

How should a retiree or near-retiree freelancer invest inside a Solo 401(k)?

Near-retirees (within 10–15 years of retirement) often do well with a balanced mix of low-cost index funds — roughly 60% stocks and 40% bonds — gradually shifting more conservative as retirement approaches. Target-date funds automate this shift for you. The key is keeping investment fees low, ideally under 0.2% annually.

How do I build an emergency fund if I’m self-employed with irregular income?

Self-employed workers should aim for a larger emergency fund than traditional employees — ideally 6 months of expenses rather than 3 — because income can be unpredictable. Keep this money in a high-yield savings account, completely separate from your retirement accounts and business funds, and treat it as untouchable except for genuine emergencies.

What is the deadline to open a Solo 401(k) for the 2026 tax year?

Your Solo 401(k) must be established (opened and documented) by December 31, 2026 to use it for the 2026 tax year. Employee contributions are due by your tax filing deadline (typically April 15, 2027), and employer contributions can be made as late as your extended filing deadline. Don’t wait until tax season — the account must exist before year-end.