When you work for yourself, nobody sets up your retirement for you. There is no HR email, no automatic enrollment, no employer match landing in an account you forgot you had.
Which is exactly why so many self-employed people reach their fifties with a thriving business and almost nothing saved.
The good news is that self-employment actually gives you access to some of the most generous retirement accounts in the tax code. You can shelter far more than a salaried employee can — often $70,000 or more a year.
The two that matter most are the SEP IRA and the Solo 401(k). Let us work through which one fits you, using the actual 2026 numbers.
One note first: this is general information, not tax or investment advice. The right choice depends on your specific income and situation, and a CPA can price it exactly. I am not a financial advisor.
Why This Matters More Than You Think
These accounts do two jobs at once, and the second one is the part people miss.
The obvious job is building retirement savings. The less obvious one is cutting this year’s tax bill — contributions to a traditional SEP or Solo 401(k) come off your taxable income directly.
Contribute $50,000 and you are not just saving $50,000. You are also reducing your modified adjusted gross income, which lowers your income tax and, if you buy your own coverage, can even affect your health insurance subsidies.
So this is not only a savings decision. It is one of the largest tax levers a self-employed person has.
The SEP IRA: Simple and Solid
A SEP IRA is the low-effort option. Easy to open, easy to run, almost no paperwork.
How much you can put in for 2026: up to 25% of compensation, capped at $72,000.
There is a catch buried in that sentence, though, and it trips people up constantly. If you are self-employed rather than incorporated, that “25%” effectively works out to about 20% of your net self-employment income after the self-employment tax adjustment.
So the headline sounds like a quarter of your income. The real figure for a sole proprietor is closer to a fifth.
What makes it appealing: you can open one at almost any brokerage in minutes, there is no annual filing, and you can decide how much to contribute after the year ends — even at tax time. That flexibility is genuinely useful when your income is unpredictable.
The main limitation: a SEP only allows employer-side contributions. There is no employee deferral, and no catch-up contribution if you are 50 or older. That single gap is what the Solo 401(k) closes.
The Solo 401(k): Higher Ceiling, More Moving Parts
A Solo 401(k) is for a business with no employees other than you and possibly a spouse. It is slightly more work to run, and it usually lets you save considerably more.
The reason is that you wear two hats. You contribute as the employee and again as the employer.
The 2026 numbers:
- Employee deferral: up to $24,500
- Employer profit-sharing: up to 25% of compensation
- Combined total: up to $72,000
- Age 50+ catch-up: brings the total to $80,000
- Ages 60–63 enhanced catch-up: up to $83,250
That employee deferral is the whole advantage. It lets you reach the maximum at a much lower income than a SEP would require.
Two more perks worth knowing: most Solo 401(k) plans offer a Roth option, so you can make contributions post-tax and withdraw tax-free later. And many allow a plan loan of up to $50,000 against your own balance — not something you want to rely on, but a genuine safety valve a SEP does not have.
The trade-off: once your balance passes $250,000, you have to file a short annual form (a 5500-EZ) with the IRS. Not difficult, but it is a step the SEP does not require.
The Number That Settles It
Here is the comparison that makes the decision obvious for most people.
Take a self-employed person earning $200,000 in net income in 2026.
- SEP IRA: about $37,174
- Solo 401(k): about $61,674
Same income. Same person. A $24,500 difference — and that gap is exactly the employee deferral the SEP does not allow.
At $24,500 more sheltered, in a decent tax bracket, that is several thousand dollars of tax saved this year alone. Every year.
The gap is even more dramatic at lower incomes, because the SEP’s percentage cap bites harder when you earn less, while the Solo 401(k)’s flat employee deferral does not.
So Which One Should You Pick?
A few clear cases.
Choose a Solo 401(k) if you have no employees, want to save as much as possible, are over 50 and want catch-up contributions, or want a Roth option. For most self-employed people earning over roughly $60,000, this is the stronger account.
Choose a SEP IRA if you value maximum simplicity, your income is highly unpredictable and you want to decide contributions after year-end, or you have employees. (A SEP requires you to contribute the same percentage for eligible employees as for yourself, which matters once you hire.)
The honest summary: if you are a solo operator without staff, the Solo 401(k) usually wins on pure numbers. The SEP wins on effort and on flexibility of timing. For a lot of people the extra $24,500 of room is worth the small amount of additional admin.
How to Actually Set One Up
Neither is complicated, and you do not need to pay anyone to do it.
Pick a provider. Major brokerages offer both accounts free of account fees. Look for one with no setup cost, low-cost index funds, and Solo 401(k) plan documents included if you go that route.
Mind the deadlines. A SEP can be opened and funded right up to your tax filing deadline, including extensions — which means you can still open one for last year. A Solo 401(k) generally must be established by December 31 of the tax year, though you can often fund it later. That deadline difference matters.
Automate it. Set a recurring transfer rather than waiting for a lump sum you may not have in April. Steady beats heroic.
Actually invest the money. Contributing is only half the job. Cash sitting uninvested in the account does nothing — pick a low-cost, diversified fund so it actually grows.
The IRS guide to retirement plans for the self-employed lays out the current rules and limits if you want the primary source.
The Options You Might Also Consider
SEP and Solo 401(k) are the heavy hitters, but they are not the only tools. A couple of others are worth knowing, especially early on or alongside.
The plain IRA — Roth or traditional
Anyone with earned income can use a regular IRA, and it stacks on top of a SEP or Solo 401(k). The 2026 contribution limit is far smaller than the business accounts, but a Roth IRA in particular is worth having.
Money in a Roth grows and comes out completely tax-free in retirement. There are income limits on who can contribute directly, so higher earners should check whether they qualify — but for many self-employed people in their early years, a Roth IRA is an easy first account.
The SIMPLE IRA
A middle option for a small business with a few employees. It allows employee deferrals like a 401(k) but with lower limits and less paperwork, and it requires an employer contribution for staff.
Most true solo operators will do better with a Solo 401(k). The SIMPLE becomes relevant once you have a handful of employees and want something lighter than a full 401(k) plan.
The HSA as a stealth retirement account
If you have a high-deductible health plan, a Health Savings Account is quietly one of the best retirement vehicles that exists. Contributions are pre-tax, growth is tax-free, and withdrawals for medical costs are tax-free too.
After 65 you can withdraw for any purpose, paying only ordinary income tax — so it behaves like a traditional IRA with an extra tax advantage for health spending. If you qualify, it is worth using alongside your main retirement account rather than instead of it.
How the Tax Saving Actually Compounds
It is easy to treat the deduction as the whole benefit. It is not — it is the smaller half.
Say you contribute $40,000 to a traditional Solo 401(k) in a 24% bracket. You save roughly $9,600 in tax this year. That alone is a strong return on a decision that took an afternoon to set up.
But the bigger story is what that $40,000 does over time. Invested and left alone for decades, it compounds — and because you were never taxed on the way in, the entire amount goes to work, not just the after-tax remainder.
Do that for even ten or fifteen years and the account becomes the largest asset most self-employed people own outside their home or business. The tax break is the hook; the compounding is the prize.
Which loops back to the one thing that matters more than picking the perfect account: starting. An imperfect account funded for fifteen years beats a perfect one you open at sixty.
A Common Order of Operations
If you are not sure where to begin, this sequence works for a lot of self-employed people.
First, build a small emergency fund so you are never forced to raid retirement money in a slow month. Three to six months of expenses is the usual target.
Then open the retirement account that fits — Solo 401(k) for most solo operators — and start contributing what you comfortably can, even if it is small.
Increase the contribution whenever your income steps up, rather than letting lifestyle absorb every raise. A good rule is to bank half of any income increase into the account before you get used to spending it.
And revisit the whole setup once a year, ideally near tax time when your numbers are in front of you. That yearly check is when you catch a bracket change, a better account fit, or simply the fact that you can now afford to contribute more.
Frequently Asked Questions
Can I have both a SEP IRA and a Solo 401(k)?
Technically yes, but the contribution limits are largely shared, so running both rarely lets you save more than picking the better one. For nearly everyone, choosing one and funding it fully is simpler and just as effective.
What if my income varies a lot year to year?
Both accounts let you skip or reduce contributions in a lean year, so you are never locked into a fixed amount. The SEP has a slight edge here because you can decide the whole contribution after the year closes, which suits genuinely unpredictable income.
Should I choose Roth or traditional?
Traditional gives you the deduction now; Roth gives you tax-free withdrawals later. If you expect to be in a higher bracket in retirement, Roth can win; if you want to cut this year’s tax bill, traditional does that. Many people split. The Roth option is only available in a Solo 401(k), not a SEP.
What happens if I hire employees later?
A Solo 401(k) is only for owner-and-spouse businesses, so hiring a non-spouse employee means you must move to a different plan. A SEP can cover employees, but you must contribute the same percentage of pay for them as for yourself, which gets expensive. Plan for this before you hire.
Is it too late to start if I am in my fifties?
No — and this is exactly when the Solo 401(k) shines. The age-50 catch-up and the enhanced catch-up for ages 60–63 let you contribute significantly more precisely when you may be trying to close a gap. Late is far better than never here.
The Bottom Line
If you are a solo operator earning a decent income and you want to save the most while cutting your tax bill, open a Solo 401(k). The employee deferral is worth the small amount of extra paperwork.
If you value simplicity above all, or your income swings wildly, a SEP IRA is a perfectly respectable choice you can set up in an afternoon.
The genuinely wrong answer is neither. Every year you go without one, you are handing the IRS money you could have kept and turning down decades of compounding.
Open something this month. You can always optimise later — but you cannot get back the years you did not start.
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