You have been freelancing for a couple of years, the income is finally steady, and someone tells you to open a SEP IRA before year end to cut your tax bill. You nod, then quietly search the term later and hit a wall of jargon. So what is a SEP IRA, in language that does not require a finance degree?
After helping dozens of freelancers, consultants, and solo agency owners sort out their retirement setup, I can tell you this account is usually the simplest place to start. It is not the best fit for everyone, and I will be specific about when it is not. But for a solo operator with real profit and no employees, it is hard to beat on effort-to-benefit.
This guide covers what the account actually is, who qualifies, the 2026 contribution math, how the tax deduction really works, and the mistakes I see people make in their first year.
What is a SEP IRA, in plain English?
SEP stands for Simplified Employee Pension. A SEP IRA is a retirement account built for self-employed people and small business owners, funded entirely by the business rather than by employee payroll deferrals.
Contributions are tax deductible, the money grows tax deferred, and you pay ordinary income tax when you withdraw it in retirement. In that sense it behaves like a traditional IRA. The difference is scale, because the annual limit is roughly ten times higher.
The “simplified” part is not marketing. There are no annual IRS filings, no plan documents to maintain, and no testing requirements. You open the account at a brokerage, contribute before your tax deadline, deduct it, and invest the balance.
Who can open one?
Any self-employed person with net profit from their business qualifies. That covers sole proprietors, freelancers, independent contractors, single-member LLC owners, and partners in a partnership.
You do not need a formal entity, a minimum income, or a track record. If you turned a profit from self-employment in a given tax year, you can fund a SEP IRA for that year.
There is one real constraint. If you have employees who meet the eligibility rules, you generally must contribute the same percentage of compensation for each of them that you contribute for yourself. That is why this account is a natural fit for solo operators and an expensive one for a business with a payroll.
Eligible employees are generally those age 21 or older who worked for you in at least three of the last five years and earned at least the annual threshold set by the IRS SEP plan rules. If you are a one-person shop, none of this applies to you.
How much can you contribute in 2026?
This is where the account earns its reputation. For 2026, you can contribute up to 25% of compensation, capped at $72,000, and only the first $360,000 of compensation counts toward the calculation.
Compare that to the 2026 traditional IRA limit of $7,500, or $8,600 if you are 50 or older. The gap is the entire argument for opening one.
Here is the part that trips people up. For a sole proprietor, the 25% applies to net earnings from self-employment, which is your net profit minus half of your self-employment tax. That circular adjustment works out to roughly 20% of net profit in practice.
Two examples using real math:
- $50,000 net profit: maximum contribution of about $9,294.
- $100,000 net profit: maximum contribution of about $18,587.
To hit the full $72,000, you need roughly $360,000 in net profit. Most freelancers I work with are contributing somewhere between $6,000 and $25,000, which is still a serious deduction.
One more detail worth knowing: there is no catch-up contribution for savers age 50 and over in a SEP IRA. The limit is the limit regardless of age.
The deadline advantage
This is my favorite feature and the one almost nobody mentions. Unlike a 401(k) employee deferral, which must be elected during the calendar year, SEP IRA contributions can be made up to your tax filing deadline including extensions.
For a sole proprietor filing an extension, that means you have until October 15 of the following year to fund the prior tax year. You get to see your finished numbers before deciding how much to shelter.
I have had clients open and fund an account in September for the previous tax year after their accountant flagged a bigger-than-expected bill. Try doing that with a 401(k) deferral.
The tax benefits, and one common misunderstanding
A SEP IRA contribution is deducted on Schedule 1 as an adjustment to income, which lowers your adjusted gross income and your federal income tax. At a 22% marginal rate, an $18,000 contribution saves roughly $3,960 in federal income tax, plus whatever your state charges.
Now the correction I end up making in almost every conversation. The contribution does not reduce your self-employment tax. That 15.3% is calculated on net profit from Schedule C before any retirement plan deduction, so the savings are on income tax only.
There is a second wrinkle. Because the deduction lowers your qualified business income, it also shrinks your 20% QBI deduction slightly, which trims the net benefit. Your accountant should model this rather than assume the headline number.
Inside the account, dividends, interest, and capital gains compound with no annual tax drag. Withdrawals in retirement are taxed as ordinary income, required minimum distributions begin at age 73, and money pulled before age 59.5 generally triggers a 10% penalty on top of income tax.
SEP IRA vs Solo 401(k) for 2026
These are the two accounts worth comparing for most solo businesses. Both are deductible, both allow far more than a traditional IRA, and both cap total additions at $72,000 for 2026.
| Feature | SEP IRA | Solo 401(k) |
|---|---|---|
| 2026 total limit | $72,000 | $72,000 |
| Employee deferral | Not available | Up to $24,500 |
| Catch-up at 50+ | None | $8,000 additional |
| Setup deadline | Tax filing deadline plus extensions | Generally by year end for deferrals |
| Annual IRS filing | None | Form 5500-EZ once assets top $250,000 |
| Roth option | Limited | Commonly available |
The practical takeaway: at lower income, the Solo 401(k) wins. A freelancer with $50,000 in net profit can put roughly $9,294 into a SEP IRA, but close to $33,800 into a Solo 401(k) by stacking the $24,500 deferral on top of the employer contribution.
At higher income the two converge, and the SEP IRA wins on simplicity because there is no plan document, no Form 5500-EZ, and no year-end election to remember. If your income is under roughly $150,000 and you want to maximize savings, run the Solo 401(k) numbers first. For a wider view of every option, our guide to retirement savings for the self-employed walks through SIMPLE IRAs and defined benefit plans too.
What about a Roth IRA?
Different job, different tool. A SEP IRA gives you a deduction now and taxable income later, while a Roth IRA gives you no deduction now and tax-free withdrawals later.
Plenty of freelancers I work with fund both, using the SEP IRA to knock down a high-income year and the Roth for tax diversification. We break the tradeoffs down properly in our SEP IRA vs Roth IRA comparison, including the income limits that apply to Roth contributions.
How to open a SEP IRA
Opening one takes about 20 minutes at any major brokerage. Fidelity, Vanguard, and Charles Schwab all offer them with no account minimum and no annual maintenance fee.
The steps are short:
- Choose a brokerage and select the SEP IRA account type during signup.
- Adopt a written plan, usually by signing IRS Form 5305-SEP, which you keep in your records rather than mailing anywhere.
- Fund the account by your filing deadline, coding the deposit to the correct tax year.
- Invest the cash, because an unfunded balance sitting in a money market does nothing for you.
That last step matters more than people expect. I have reviewed accounts where two years of contributions were still sitting in cash because the client assumed depositing money was the same as investing it.
Most solo savers do fine with a single low-cost total market index fund as a starting position. You can add complexity later once the habit is established.
Mistakes I see in the first year
The most expensive one is guessing at the contribution instead of calculating it. Over-contributing triggers a 6% excise tax for every year the excess stays in the account, so run the number with tax software or your accountant before you send money.
The second is tagging the deposit to the wrong tax year. Brokerages ask which year a contribution applies to, and a mis-tagged January deposit is annoying to unwind.
The third is treating the account as a substitute for tax planning. A SEP IRA lowers income tax, not self-employment tax, so you still need to make quarterly estimated tax payments on schedule. Pair it with disciplined expense tracking, since every deduction you capture on Schedule C compounds with the retirement deduction.
The fourth is skipping a bookkeeping system entirely. You cannot calculate net profit accurately without clean books, and the contribution math depends on it. Our step-by-step bookkeeping guide covers a setup that takes about an hour.
When a SEP IRA is the wrong choice
If you have eligible W-2 employees, the matching-percentage requirement can make this the most expensive plan on the menu. A SIMPLE IRA or a traditional 401(k) usually costs less per dollar saved.
If your income is modest and you want the largest possible deduction, the Solo 401(k) deferral will beat it. And if you expect to be in a higher tax bracket in retirement than you are now, a Roth account may serve you better.
The SBA guide to small business taxes is a reasonable second opinion if you want a neutral source before committing.
Do this week
- Pull your year-to-date net profit and multiply by 0.20 for a fast estimate of your maximum contribution.
- Compare that figure against a Solo 401(k) projection if your net profit is under $150,000.
- Open the account at Fidelity, Vanguard, or Schwab if you do not already have one.
- Ask your accountant to model the deduction against your bracket and your QBI deduction.
- Automate a percentage of each client payment into a savings account earmarked for the contribution.
- Put your filing and extension deadlines on the calendar as funding windows.
- Confirm any cash already in the account is actually invested.
Final thoughts
A SEP IRA will not solve every retirement problem, but it is the least demanding way for a profitable solo business to move real money out of the taxable column. High limits, a late deadline, and almost no paperwork is a rare combination.
Start with whatever you can fund this year, raise it as profit grows, and revisit the Solo 401(k) comparison every January. The compounding does the rest.
What is a SEP IRA in simple terms?
It is a retirement account funded by your business rather than by payroll deferrals. You deduct the contribution now, the balance grows tax deferred, and you pay ordinary income tax when you withdraw in retirement.
What is a SEP IRA contribution limit for 2026?
For 2026 the limit is 25% of compensation up to $72,000, with only the first $360,000 of compensation counted. Sole proprietors calculate 25% of net earnings from self-employment, which works out to roughly 20% of net profit.
Can I open a SEP IRA if I also have a full-time job?
Yes. As long as you have net profit from self-employment, you can fund a SEP IRA on that income even if you also participate in an employer 401(k), though combined limits can apply.
Does a SEP IRA reduce self-employment tax?
No. The deduction is taken as an adjustment to income and lowers your federal income tax only. Self-employment tax is calculated on net profit before the retirement deduction.
When is the deadline to contribute?
You have until your tax filing deadline including extensions, which can be as late as October 15 of the following year for a sole proprietor who files an extension.
What happens if I contribute too much?
Excess contributions are subject to a 6% excise tax for each year they remain in the account. You can correct the excess by withdrawing it, along with any earnings, before your filing deadline.
Can I have both a SEP IRA and a Roth IRA?
Yes, and many self-employed savers do. The SEP IRA handles the current-year deduction while the Roth builds a pool of tax-free retirement income, subject to the usual Roth income limits.
