SEP IRA vs Solo 401(k) for Freelancers

A regular IRA caps out at $7,500 a year for 2026 — not much of a tax shelter once freelance income grows past a certain point. Both a SEP IRA and a Solo 401(k) let a self-employed freelancer with no full-time employees contribute far more, up to the same $72,000 overall 2026 limit set by the IRS. Where they differ is how you get there: a SEP IRA only allows one type of contribution, while a Solo 401(k) allows two, and that structural difference means the two accounts favor very different income levels.

Coming from a consulting background, pricing structure and long-term cost are usually what I look at first, ahead of feature lists — and for retirement accounts, the "cost" that matters most is which structure actually gets more money into tax-advantaged savings for a given income.

What actually matters when choosing between them

• Your income level — a Solo 401(k) generally allows a much larger contribution than a SEP IRA at the same income, especially below roughly $200-300k in net self-employment earnings
• Whether you want a Roth option — Solo 401(k)s commonly offer Roth contributions on the employee-deferral portion; Roth SEP IRAs exist but availability depends on the provider
• Setup deadline — a Solo 401(k) must generally be established by December 31 of the tax year you want it to count for; a SEP IRA can be opened as late as your business's tax filing deadline (including extensions), which matters if you're reading this after the new year
• Paperwork tolerance — a SEP IRA has essentially no ongoing filing requirement; a Solo 401(k) requires a one-time Form 5500-EZ once plan assets exceed $250,000

Quick comparison

SEP IRA — the simplest option, if you're comfortable with the ceiling it puts on lower incomes

A SEP IRA is funded entirely through a single employer-style contribution, capped at 25% of net self-employment compensation, up to the $72,000 overall 2026 limit. There's no separate employee-deferral portion, no age-based catch-up, and essentially no ongoing administration — which is genuinely appealing if your income fluctuates year to year and you want the flexibility to contribute 25%, 10%, or 0% depending on how the year went, decided as late as your filing deadline. The trade-off is that reaching a meaningful contribution requires a correspondingly high income: at $150,000 in net self-employment income, the SEP IRA maximum works out to $37,500.

Best for: freelancers who want the simplest possible account, fluctuating income, or who are deciding how much to contribute after the tax year has already ended.

Solo 401(k) — higher effective contributions at the same income, plus Roth

A Solo 401(k) splits the contribution into two pieces: an employee salary deferral (up to $24,500 in 2026, or more with catch-up past 50) plus an employer contribution of up to 25% of compensation, both counting toward the same $72,000 combined limit. At that same $150,000 income example, the math works out to roughly $24,500 (employee) plus $37,500 (employer) — about $62,000 total, versus $37,500 for a SEP IRA at identical income. The gap is real money: nearly $25,000 more sheltered from taxes in a single year at that income level. Most providers also allow the employee-deferral portion to go into a Roth account, funded with after-tax dollars for tax-free growth and withdrawals later — an option a SEP IRA rarely offers.

Best for: most freelancers below very high income who want to maximize how much gets into tax-advantaged savings each year, and anyone who wants a Roth contribution option.

Where to actually open one

Fidelity, Charles Schwab, and E*TRADE all offer Solo 401(k) accounts with no account-opening fee and no annual account fee for a typical individual investor, differing mainly in available fund lineups and whether they support Roth contributions in-house (Fidelity's version has historically been pre-tax only, requiring a workaround for Roth; check current provider details before assuming either way). SEP IRAs are even more widely available, since they're offered by nearly every major brokerage as a standard account type. In both cases, the account itself is usually free to open and hold — the only real cost is whatever the underlying investments charge.

Which one actually fits

If your net self-employment income is comfortably above $250,000-300,000, the gap between the two narrows considerably, since a SEP IRA's 25% can reach the same $72,000 ceiling on its own — at that point, the SEP IRA's simplicity becomes the more compelling factor. Below that, the Solo 401(k)'s employee-deferral piece consistently allows more money into tax-advantaged savings for the same income, which is why it's the better default for most freelancers. Getting the contribution amount right assumes you already know what to set aside for taxes in the first place — see our tax software guide if quarterly estimates are still a guessing game.

Bottom line

For most freelancers below roughly $250,000 in net self-employment income, a Solo 401(k) shelters meaningfully more money at the same income than a SEP IRA, and adds a Roth option most SEP IRA providers don't offer. Reach for a SEP IRA specifically if you want the simplest possible account, your income swings enough that flexibility matters more than maximizing the number, or you're opening an account retroactively after the Solo 401(k)'s earlier setup deadline has already passed for the year. Whichever you pick, the contribution only helps if the rate behind your freelance income actually supports setting money aside in the first place — see our guide to pricing freelance work if that's the part still worth revisiting.

This article is for general informational purposes and isn't tax, legal, or investment advice. Contribution limits shown are for 2026 and change annually with IRS cost-of-living adjustments; confirm current limits and eligibility with a qualified financial advisor or CPA for your specific situation.