Retirement Plans for the Self-Employed (SEP IRA, Solo 401(k) and More)

The part nobody tells you: self-employment is a retirement upgrade

Here's the reframe that changes everything. In an employer plan, you play one role — employee — so your main lever is the employee deferral limit: $24,500 in 2026. When you're self-employed, the IRS treats you as both the employee and the employer. You can make the employee contribution and the employer contribution, into the same account, from the same business income. That's why the overall cap on "annual additions" to a defined contribution plan — $72,000 for 2026 under the IRS cost-of-living adjustments — is realistically reachable for a self-employed person in a way it almost never is for a regular employee without a very generous employer.

And this isn't only for full-time freelancers. Any net self-employment income opens the door: a $6,000-a-year Etsy shop, weekend consulting, 1099 delivery driving. You don't need an LLC or a business bank account — a sole proprietor filing Schedule C qualifies. Even if your day job already has a 401(k), your side hustle can fund its own retirement accounts on top (more on how those limits interact below). The room is sitting there; most people just never claim it.

The four accounts, one line each

These are the options the IRS lists for self-employed people, plus the plain IRA everyone with earned income can use. All 2026 figures are from the IRS 2026 cost-of-living announcement.

• •Traditional or Roth IRA — best for: everyone as a starting point, and anyone saving up to about $7,500 a year · 2026 room: $7,500, or $8,600 if you're 50 or older · effort: five minutes at any broker, no business paperwork at all.
• •SEP IRA — best for: solo earners with variable income who want one simple, skippable contribution · 2026 room: up to 25% of net self-employment earnings (about 20% of net profit — see below), capped at $72,000 · effort: one form to set up, no annual IRS filing, and you can contribute nothing in a lean year.
• •Solo 401(k) — best for: maximizing savings at modest profit levels, and anyone who wants a Roth option · 2026 room: $24,500 employee deferral ($32,500 if 50+, $35,750 at ages 60–63) plus an employer contribution of about 20% of net profit, up to $72,000 combined before catch-ups · effort: more setup paperwork, and Form 5500-EZ once plan assets pass $250,000.
• •SIMPLE IRA — best for: small businesses with a few employees; rarely the winner for a true solo operation · 2026 room: $17,000 in deferrals ($21,000 if 50+) plus a small employer match or 2% contribution · effort: moderate; must be set up between January 1 and October 1.

A plain-language decision path

1. 1

   Just starting, or saving a modest amount? Use an IRA.

   If your side income is new or you won't save more than $7,500 this year, a traditional or Roth IRA does the job with zero business paperwork. You can open one today, and it remains useful later — the IRA limit is separate from all the business plans below.

2. 2

   Want simplicity with an income that swings? Open a SEP IRA.

   A SEP IRA is one decision a year: contribute anywhere from nothing up to about 20% of your net profit, and you can make that call at tax time, after you know exactly what you earned. The IRS explicitly allows skipping years entirely. It's the lowest-maintenance way to save a meaningful percentage of a variable income.

3. 3

   Want maximum room or a Roth option? Open a solo 401(k).

   Because a solo 401(k) includes the employee deferral, it beats a SEP at modest incomes: on $30,000 of net profit, a SEP allows roughly $5,500–$6,000, while a solo 401(k) lets you defer up to $24,500 of that same profit, plus the employer piece. It's also the only self-employed plan where Roth contributions are widely available today. A spouse who earns income from the business can join too, doubling the household's room.

What "25% of net earnings" really means

The SEP and the employer half of a solo 401(k) both allow contributions of up to 25% of your compensation. For the self-employed there's a twist: your compensation isn't your gross revenue or even your Schedule C profit. Per the IRS, it's your net earnings from self-employment minus the deduction for one-half of your self-employment tax, and minus the contribution itself. Because the contribution reduces its own base, the practical result is that the 25% rate works out to roughly 20% of your net profit. IRS Publication 560 has the exact worksheet, and any decent tax software runs the calculation for you.

One honest caveat on Roth. A solo 401(k) can include a designated Roth option for your employee deferrals, and many providers offer it. For SEP and SIMPLE IRAs, the SECURE 2.0 Act has permitted Roth contributions since 2023 and IRS Publication 560 confirms it — but a plan or provider isn't required to offer it (the IRS phrasing is that you "may choose" to allow Roth contributions), and in practice many SEP custodians still handle only pre-tax money. If Roth matters to you, ask the provider before you open the account — or just use the solo 401(k), where Roth is standard. And once real money starts flowing through your business, an hour with a tax professional is genuinely worth the fee; the contribution math above is exactly the kind of thing they do daily.

Deadlines: when each account can be opened and funded

The deadlines are surprisingly forgiving — two of these accounts can be opened after the year is already over.

• •IRA — contribute for a given year until that year's tax filing deadline, not including extensions (mid-April).
• •SEP IRA — the most flexible by far: per the IRS, you can set one up and fund it "as late as the due date (including extensions) of your income tax return" for that year. You could open a SEP in October 2027 and still make a 2026 contribution.
• •Solo 401(k) — a sole proprietor with no employees can adopt the plan after year-end, up to the tax filing deadline without extensions. But employee deferrals must generally be elected by December 31 of the year they're for (the money itself can be deposited by the filing deadline, including extensions), and the employer profit-sharing piece can also wait until then. Practical rule: open it before New Year's Eve.
• •SIMPLE IRA — must be set up between January 1 and October 1 of the year, with deferrals made during the year. Not a plan you can start retroactively.

Side hustle + day job: how the limits actually interact

This is where most online advice gets sloppy, so here's the rule exactly as the IRS states it. The elective deferral limit — $24,500 in 2026 — is per person, not per plan: you aggregate everything you defer into all 401(k), 403(b) and SIMPLE plans across all employers. If you put $20,000 into your day job's 401(k), you can only defer $4,500 more into your solo 401(k) that year.

But the overall $72,000 annual additions limit works differently: per the IRS, it applies to each unrelated employer's plan separately. Your day job's plan has its own $72,000 ceiling, and your solo 401(k) has another. So even if you max out your day-job deferrals, your business can still make employer contributions of roughly 20% of its net profit into your solo 401(k) — and a SEP IRA contribution is entirely employer-side, so it doesn't touch your deferral limit at all. A maxed-out 401(k) at work plus a SEP or employer-funded solo 401(k) from your side hustle is a completely legitimate, IRS-sanctioned combination.

The Saver's Credit: getting paid to contribute

If your income is modest — common in the early side-hustle years — the Retirement Savings Contributions Credit (Saver's Credit) can refund 50%, 20% or 10% of your first $2,000 in contributions ($4,000 married filing jointly) as a credit against your tax bill, worth up to $1,000 per person. For 2026, the credit phases out at adjusted gross income above $40,250 for singles, $60,375 for heads of household and $80,500 for married couples filing jointly.

Self-employed savers qualify on the same terms as employees. Your IRA contributions and your elective deferrals into a solo 401(k) or SIMPLE IRA all count as eligible contributions. One nuance: employer-side money — like a SEP contribution or your solo 401(k) profit-sharing piece — is not an elective deferral, so it doesn't count toward the credit. If you're in the income range, route at least the first $2,000 through an IRA or solo 401(k) deferral to collect it.

Why the self-employed actually win here

Look at the asymmetry. An employee's retirement plan is decided by someone else: which provider, which funds, whether there's a match, whether there's a Roth option, whether there's a plan at all. A self-employed person gets to choose every one of those things — and gets nearly three times the contribution ceiling while doing it, because the IRS lets you wear both the employee and employer hats. Even the deadlines favor you: no employee can walk into HR in April and contribute to last year's 401(k), but a freelancer can open a SEP IRA at tax time and fund the year that already ended.

The catch has never been the rules. It's that nobody sets this up for you. There's no auto-enrollment email, no default target-date fund, no payroll deduction that starts without your signature. The entire gap between self-employed people who retire well and those who don't is a one-time hour of setup and a habit of moving a percentage of every payout into the account. Your side hustle is already generating the one ingredient — earned income — that all of these accounts require. Claim the room the IRS is holding open for you.

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