SEP-IRA vs Solo 401(k) vs SIMPLE IRA: self-employed retirement, compared

Being self-employed means you're your own HR department — including the retirement plan nobody sets up for you. The good news is that the accounts built for the self-employed let you shelter far more than a regular IRA, often tens of thousands a year. The three main options — SEP-IRA, Solo 401(k), and SIMPLE IRA — differ in how much you can contribute, how much paperwork they demand, and whether you have employees. Here's the comparison, as general education; a CPA or financial advisor should confirm the specifics for your business and income.

SEP-IRA: dead simple, high ceiling

A SEP-IRA is the easiest to open and run — minimal paperwork, no annual filing, contribute a percentage of your net self-employment income up to a high cap. Its simplicity makes it a favorite for solo freelancers and consultants who want to shelter a lot without administrative fuss. The catch shows up if you have employees: you must contribute the same percentage for them as for yourself, which gets expensive fast. For a true solo operator with strong income, it's a clean, powerful choice.

Solo 401(k): the contribution champion

A Solo 401(k) (also called an individual or one-participant 401(k)) is usually the winner for a self-employed person with no employees, because you contribute in two capacities — as the 'employee' (a salary-deferral amount) and as the 'employer' (a percentage of profit) — which lets you reach the same high total ceiling as a SEP at much lower income, and often shelter more. It typically offers a Roth option and the ability to take a loan. The trade-off is more setup and, once the balance crosses a threshold, an annual IRS filing. For solo owners maximizing savings, it's the strongest tool.

SIMPLE IRA: for small businesses with staff

A SIMPLE IRA is built for small businesses (roughly up to 100 employees) that want to offer a plan without 401(k)-level cost and administration. Employees can contribute and the employer makes a required matching or fixed contribution. Its contribution limits are lower than the SEP or Solo 401(k), so it's rarely the pick for a solo operator trying to max savings — it's the answer when you have a small staff and need a real, low-overhead group plan. If you're a team of one, the other two almost always let you save more.

The verdicts

• Solo operator maximizing contributions: Solo 401(k) — the highest effective savings, plus Roth and loan options.
• Solo operator who wants zero admin and has strong income: SEP-IRA.
• Small business with employees, low overhead: SIMPLE IRA.
• Growing team, want the fullest features: consider a full 401(k) plan.
• Everyone: check the current-year IRS contribution limits — they change annually.

The bottom line

For the self-employed, the retirement account you don't open is the raise you don't take — these plans shelter far more than a standard IRA and cut your tax bill doing it. Solo operators chasing maximum savings usually land on the Solo 401(k); those prizing simplicity pick the SEP; small teams reach for the SIMPLE. Confirm the current limits and your specific eligibility with a CPA or advisor, then actually fund the thing — the tax-advantaged space is only valuable if you use it.