Part of the Retirement Planning guide.
The main guide compares SEP IRA and Solo 401(k) as the two primary options for a true solo freelancer. This covers the third option you’ll see mentioned everywhere — the SIMPLE IRA — and gives an honest answer on when it actually fits, since for most of this guide’s audience, it doesn’t.
What a SIMPLE IRA Actually Is
A SIMPLE IRA is built for small employers who want to offer a retirement plan to real employees without taking on the cost and complexity of a full 401(k). It allows genuine employee salary-reduction contributions — the standard 2026 cap is $17,000, but SECURE 2.0 created an enhanced tier specifically for small employers: if you have 10 or fewer employees, the deferral limit rises automatically to 110% of the standard cap — $18,700 for 2026 — with a correspondingly higher catch-up limit for participants 50 and older. Since this guide’s audience is almost entirely freelancers and micro-businesses, this enhanced tier is the number that actually applies to most readers here, not the base $17,000 figure.
That $18,700 ceiling is still the entire story for most freelancers reading this guide: it’s dramatically lower than the $72,000 combined limit a Solo 401(k) allows.
One other update worth knowing: SIMPLE IRAs were historically pre-tax only, but under SECURE 2.0 they can now accept Roth (after-tax) contributions as well — provided your specific custodian’s platform actually supports it, which isn’t universal yet across providers.
The Honest Answer for a True Solo Freelancer
If you have no employees — just you, possibly with a spouse — a SIMPLE IRA is very rarely the right choice. Both the SEP IRA and Solo 401(k), already covered in the main guide, allow substantially higher contributions at every income level a freelancer is likely to be working with. There’s no scenario where a solo operator with no staff should default to a SIMPLE IRA over those two options based on contribution capacity alone.
Where It Actually Fits
The SIMPLE IRA earns its place specifically once you have, or are about to have, real employees you want to offer a retirement benefit to — and you want something simpler and cheaper to administer than a standard 401(k), while still giving those employees the ability to contribute their own money, not just receive an employer contribution.
This is the genuine trade-off against a SEP IRA in that scenario: a SEP IRA is employer-contributions only, and every eligible employee has to receive the same percentage of their compensation as you contribute for yourself — which gets expensive fast once you have staff and want to maximize your own contribution. A SIMPLE IRA lets employees fund their own accounts through salary deferral, which can make it more cost-effective for the business once headcount grows beyond just you.
Setup Deadlines Have Converged More Than People Realize
While this piece is about SIMPLE IRAs, it’s worth correcting something the rest of this pillar could easily leave you assuming: a SEP IRA’s late-establishment flexibility isn’t as unique as it used to be. Under SECURE 2.0, a Solo 401(k) can now also be adopted as late as your tax filing deadline, including extensions — the old hard December 31 plan-establishment deadline was extended for the employer profit-sharing portion specifically. The catch is narrower than it sounds: if you want to make an employee deferral for that same year, the plan still needs to be active before year-end, since you can’t defer salary you’ve already received. But if you’re only funding the employer side, or deciding late in the year with limited income visibility, a Solo 401(k) is no longer automatically ruled out the way it once was.
A SIMPLE IRA, by contrast, still has to be established by October 1 of the plan year for new plans — the tightest deadline of the three options covered across this pillar.
Quick Reference
| SIMPLE IRA | SEP IRA | Solo 401(k) | |
| Best for | Small business with real employees | Uneven income, late decisions | Solo freelancer, no employees |
| 2026 contribution ceiling | $18,700 employee deferral (≤10 employees) | $72,000 (25% of comp) | $72,000 combined |
| Employee contributions allowed | Yes | No | Yes (as the “employee” role) |
| Setup deadline | Before October 1 of the plan year | Tax filing deadline + extensions | Tax filing deadline + extensions (employer portion); before year-end if making an employee deferral |
The Bottom Line
For the vast majority of this guide’s readers — solo freelancers with no staff — this comparison exists mainly to close the loop, not to change your decision. The SEP IRA vs. Solo 401(k) framework in the main guide remains the real choice for you. The SIMPLE IRA becomes relevant only at the specific moment your business shape changes to include real employees you’re trying to offer a benefit to.
Sources: IRS SIMPLE IRA contribution limits and eligibility rules; IRS SEP IRA establishment deadline guidance; comparative employer-contribution requirements for SEP vs. SIMPLE plans.
This article is educational content, not individualized tax or legal advice. Consult a qualified professional about your specific situation.