Retirement Contributions as a Tax Deduction: SEP IRA and Solo 401(k) for Freelancers

Freelancers and self-employed workers face higher tax bills than W-2 employees—but you also have access to powerful retirement account options that can cut your taxable income dramatically. Contributing to a SEP IRA or Solo 401(k) not only builds your nest egg but also delivers an immediate tax deduction that lowers both income and self-employment tax. This guide shows you exactly how retirement contributions work as a deduction, how much you can save, and which account fits your situation.

Key Takeaways

• SEP IRA and Solo 401(k) contributions are deductible on your Form 1040, reducing both income tax and self-employment tax.
• 2026 contribution limits: SEP IRA allows up to 25% of net self-employment income (max $69,000); Solo 401(k) allows up to $23,500 employee deferral plus 25% employer contribution (total max $69,000, or $76,500 if 50+).
• You claim the deduction on Form 1040, line 16 (self-employed retirement plans), not on Schedule C.
• Contributions must be made by your tax filing deadline (including extensions) for the prior tax year.
• A Solo 401(k) offers higher contribution potential for high earners and the option for a Roth component.

How Retirement Contributions Reduce Your Tax Bill

When you contribute to a qualified self-employed retirement plan, you get an "above-the-line" deduction. This means you report it on Schedule 1 (Form 1040), which reduces your adjusted gross income (AGI) before you take the standard or itemized deduction.

Lower AGI means:

• Lower income tax: you keep more dollars out of federal (and state) tax brackets.
• Lower self-employment tax: your net self-employment income drops, cutting your Social Security and Medicare tax by roughly 14.1% of the contribution amount (after accounting for the deduction adjustment).
• Eligibility for other tax breaks: lower AGI can help you qualify for deductions and credits that phase out at higher income levels.

Unlike contributions to a traditional IRA (which have income limits if you or a spouse have a workplace plan), SEP IRA and Solo 401(k) contributions have no income phase-outs for self-employed individuals. If you have self-employment income, you can contribute and deduct.

SEP IRA: Simple Setup, Big Deduction

A Simplified Employee Pension (SEP) IRA is the easiest self-employed retirement plan to set up and administer. You open an account, contribute cash, and deduct the contribution—no annual filing requirements.

Contribution Limits for SEP IRA (2026)

• Up to 25% of your net self-employment income, after subtracting half of your self-employment tax.
• Maximum contribution: $69,000 for 2026.

The calculation is trickier than it sounds because "net self-employment income" is your Schedule C profit minus the deductible half of your self-employment tax. The effective contribution rate works out to about 20% of your Schedule C profit for most freelancers.

Example: You earned $100,000 net profit on Schedule C in 2026. Your self-employment tax is roughly $14,130, and you deduct half ($7,065) on Form 1040. Your net self-employment income is $100,000 − $7,065 = $92,935. Multiply by 25%: $92,935 × 0.25 = $23,234. You can contribute and deduct $23,234 to your SEP IRA.

Pros and Cons

Pros:

• Dead simple to open and fund (most brokerages offer SEP IRAs).
• No annual IRS filing (Form 5500) required.
• Contributions are flexible year to year—contribute a lot in high-income years, skip in lean years.

Cons:

• If you have employees, you must contribute the same percentage for them (can get expensive).
• Lower contribution limit than Solo 401(k) for the same income level.

Solo 401(k): Maximum Contributions for High Earners

A Solo 401(k) (also called an Individual 401(k) or Self-Employed 401(k)) is designed for business owners with no employees other than a spouse. It works like a corporate 401(k) but you act as both employer and employee, unlocking two contribution streams.

Contribution Limits for Solo 401(k) (2026)

1. Employee deferrals: up to $23,500 (or $31,000 if you're 50 or older) from your compensation.
2. Employer profit-sharing: up to 25% of net self-employment income (same calculation as SEP IRA).
3. Total combined limit: $69,000 (or $76,500 age 50+).

Example: Same $100,000 Schedule C profit. You can contribute:

• Employee deferral: $23,500
• Employer contribution: $23,234 (25% of net self-employment income, as calculated above)
• Total: $46,734 deductible contribution

If you're 50+, you can add a $7,500 catch-up for a total of $54,234.

Pros and Cons

Pros:

• Highest possible contribution for self-employed individuals.
• Option to make Roth contributions (pay tax now, grow tax-free).
• Can take a loan from the plan if structured properly.

Cons:

• More paperwork to set up (requires a plan document).
• Once assets exceed $250,000, you must file Form 5500-EZ annually.
• Slightly more complex administration than SEP IRA.

SEP IRA vs. Solo 401(k): Which Is Right for You?

Rule of thumb: If your Schedule C profit is under $50,000 and you want zero hassle, choose a SEP IRA. If you clear $75,000+ and want to contribute the maximum, go Solo 401(k).

How to Claim the Deduction

1. Calculate your contribution: Use the worksheets in IRS Publication 560 (Retirement Plans for Small Business) or your tax software.
2. Make the contribution: Send funds to your SEP IRA or Solo 401(k) custodian. Deadline is your tax return due date including extensions (October 15 for most calendar-year filers).
3. Report on Form 1040: Enter the deduction on Schedule 1, line 16 ("Self-employed SEP, SIMPLE, and qualified plans"). This flows to Form 1040, line 10, reducing your AGI.
4. Do not put it on Schedule C: Retirement contributions for yourself are not a business expense on Schedule C; they're a personal deduction on Form 1040.

The deduction reduces your income tax and, indirectly, your self-employment tax (because it lowers net earnings). You'll calculate self-employment tax on Schedule SE based on your Schedule C profit, but the retirement deduction on Form 1040 reduces the taxable income subject to income tax.

Worked Example: Real Tax Savings

Scenario: You're a freelance designer, single, and earned $80,000 net profit on Schedule C in 2026.

Without retirement contribution:

• Schedule C profit: $80,000
• Self-employment tax (Schedule SE): ~$11,304
• Adjusted gross income (AGI): $80,000 − $5,652 (half SE tax) = $74,348
• Taxable income (after $14,600 standard deduction): $59,748
• Federal income tax (2026 rates, approximate): ~$8,500
• Total tax: $11,304 + $8,500 = $19,804

With $16,000 Solo 401(k) contribution:

• Schedule C profit: $80,000 (unchanged)
• Self-employment tax: ~$11,304 (same)
• Retirement deduction: $16,000
• Adjusted gross income: $74,348 − $16,000 = $58,348
• Taxable income: $58,348 − $14,600 = $43,748
• Federal income tax: ~$6,150
• Total tax: $11,304 + $6,150 = $17,454

Tax savings: $2,350 in the first year alone, plus $16,000 growing tax-deferred for retirement. Your effective federal tax rate on that $16,000 contribution was about 15%.

Common Mistakes to Avoid

• Missing the deadline: Contributions must be made by your tax filing deadline (with extensions). If you file in April without an extension and haven't funded the account, you can't claim the deduction.
• Overfunding: Contributing more than the limit triggers a 6% excise tax on the excess every year it remains in the account. Double-check your calculations or use Publication 560 worksheets.
• Putting it on Schedule C: Self-employed retirement deductions go on Form 1040, not Schedule C. Your tax software should handle this, but manual filers often get it wrong.
• Forgetting to reduce by half of SE tax: The contribution limit is based on net self-employment earnings, which is your Schedule C profit minus half your self-employment tax. Skipping that step inflates your allowed contribution.
• Not setting up the plan before year-end (Solo 401k): A Solo 401(k) must be established by December 31 of the tax year (though you can fund it until the filing deadline). A SEP IRA can be opened and funded up to the filing deadline.
• Contributing as both W-2 employee and self-employed without coordination: If you max out a 401(k) at a day job ($23,500), you can't also defer $23,500 in a Solo 401(k). The employee deferral limit is per person across all plans, though the employer contribution portion is separate.

Can You Contribute to Both an IRA and a Self-Employed Plan?

Yes. You can contribute to a traditional or Roth IRA in addition to a SEP IRA or Solo 401(k). For 2026, the IRA contribution limit is $7,000 ($8,000 if 50+). However, if you (or your spouse) are covered by a retirement plan at work—including your own SEP or Solo 401(k)—the deduction for a traditional IRA phases out at higher income levels. Roth IRA contributions also phase out based on income. Check IRS Publication 590-A for current phase-out ranges.

Traditional vs. Roth Solo 401(k): Should You Pay Tax Now?

Solo 401(k) plans can offer a Roth option. With Roth contributions, you don't get an up-front deduction (no tax savings this year), but qualified withdrawals in retirement are 100% tax-free.

Choose traditional (deductible) if:

• You're in a high tax bracket now and expect to be in a lower bracket in retirement.
• You need to reduce this year's tax bill.

Choose Roth if:

• You're early in your freelance career with lower income now, but expect higher income (and higher tax rates) later.
• You want tax diversification in retirement.

Many freelancers split contributions: maximize the employer profit-sharing portion (always traditional) and choose Roth for part or all of the employee deferral.

Next Steps: Start Saving (and Deducting) Today

Retirement contributions are one of the single best tax moves for freelancers. You cut your tax bill now and build wealth for later—win-win. If you earned self-employment income in 2025, you still have until April 15, 2026 (or October 15 with an extension) to open a SEP IRA and make a deductible contribution for tax year 2025.

Ready to estimate your contribution and deduction? Use our Self-Employment Tax Calculator to see how a retirement contribution affects your bottom line, or read our guide on How to Pay Estimated Taxes to factor retirement savings into your quarterly payments. If your situation is complex—multiple income streams, employees, or entity choice questions—talk to a CPA who specializes in self-employed clients.

Related guides

• Self-Employment Tax Explained: The 15.3% You Can't Avoid
• How Much Should Freelancers Set Aside for Taxes?
• Self-Employed Health Insurance Deduction: How Freelancers Can Cut Their Tax Bill
• Roth IRA for Freelancers: Backdoor Strategy Explained (2026)
• How Much Should Freelancers Save for Retirement?

Run the numbers

• Self-Employment Tax Calculator