Yes. SEP IRA contributions do reduce your taxable income, because they come off your gross income before your adjusted gross income is figured. For the 2026 tax year, the deduction is capped at the lesser of 25% of eligible compensation or $72,000.1Internal Revenue Service. COLA Increases for Dollar Limitations on Benefits and Contributions The tax isn’t erased — it’s deferred until you pull the money out in retirement — but in the year you contribute, your federal income tax bill goes down.
How the Deduction Actually Works
A SEP IRA contribution is an “above-the-line” deduction. That means it reduces your adjusted gross income directly, rather than being an itemized deduction on Schedule A.2Internal Revenue Service. Self-Employed Individuals: Calculating Your Own Retirement Plan Contribution and Deduction You get the benefit whether or not you itemize anything else.
Lowering AGI matters beyond the tax bracket itself. A number of credits, deduction phaseouts, and the net investment income tax key off AGI, so a large SEP contribution can keep you under thresholds that would otherwise strip away other tax benefits.
One limit worth knowing up front: a SEP IRA contribution does not reduce self-employment tax. The Social Security and Medicare portions are calculated on your net self-employment earnings before the SEP deduction is applied. The deduction only touches federal income tax. And if you are self-employed, your personal SEP contribution goes on Schedule 1 of Form 1040 as an adjustment to income, not on Schedule C as a business expense.2Internal Revenue Service. Self-Employed Individuals: Calculating Your Own Retirement Plan Contribution and Deduction Employer contributions made on behalf of employees are deducted on the business return.
The specific line on Schedule 1, Part II, reads “Self-employed SEP, SIMPLE, and qualified plans.” The total from Part II flows to Form 1040, line 10, where it reduces gross income to arrive at AGI.3Internal Revenue Service. 2025 Schedule 1 (Form 1040)
How Much You Can Deduct in 2026
The headline number is 25% of the employee’s compensation, up to $72,000. Compensation counted in the calculation is capped at $360,000, so higher earnings above that ceiling don’t produce a bigger contribution.1Internal Revenue Service. COLA Increases for Dollar Limitations on Benefits and Contributions
For self-employed filers, the math is not simply net profit multiplied by 25%. You first reduce net self-employment earnings by the deductible half of your self-employment tax, and then by the SEP contribution itself. Because the contribution is inside the formula that produces it, a nominal 25% plan rate works out to an effective rate of about 20% of adjusted net profit. The IRS gives a rate table in Publication 560: at a 25% plan rate, the reduced rate applied to adjusted net earnings is roughly 18.59%; at a 10% plan rate, it drops to about 9.09%.2Internal Revenue Service. Self-Employed Individuals: Calculating Your Own Retirement Plan Contribution and Deduction
Going over the limit is expensive. Excess contributions carry a 6% excise tax for each year they remain in the account until corrected.4Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities The excess portion is not deductible either way.5Internal Revenue Service. SEP Plan Fix-It Guide – Contributions to the SEP-IRA Exceeded the Maximum Legal Limits
When the Contribution Has to Be Made
The SEP IRA deadline is unusually generous. Contributions for a given tax year can be made up to the due date of your federal income tax return for that year, including extensions.6Internal Revenue Service. Simplified Employee Pension Plan (SEP) For a sole proprietor, that generally means April 15, or as late as October 15 with an extension. Corporate deadlines vary by entity type.
You can also establish a brand-new SEP as late as the extended due date of the business return for the year you want to deduct.7Internal Revenue Service. Retirement Plans FAQs Regarding SEPs That flexibility is one of the SEP’s most useful tax-planning features: if you finish your books in March and see the profit was bigger than expected, you can still open a plan and take the deduction against the prior year. Most other retirement plans don’t allow that.
Setup itself is light. Many employers adopt the plan using IRS Form 5305-SEP, a model agreement that requires no custom document and no IRS determination letter. Employers who use Form 5305-SEP and hand a copy to each eligible employee are not required to file Form 5500 or 5500-EZ for the plan.8Internal Revenue Service. Form 5305-SEP – Simplified Employee Pension Individual Retirement Accounts Contribution Agreement
What the SEP Deduction Costs You Elsewhere
Once you contribute to a SEP, the IRS treats you as “covered by a retirement plan at work” for traditional IRA purposes, even if you are self-employed. That can shrink or eliminate a separate traditional IRA deduction depending on your income.9Internal Revenue Service. IRA Deduction Limits
The 2026 phaseout ranges for the traditional IRA deduction, when the contributor is covered by a plan, are:10Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
- Single filers: $81,000 to $91,000 of modified AGI.
- Married filing jointly, contributing spouse covered: $129,000 to $149,000.
- Married filing jointly, contributing spouse not covered but other spouse is: $242,000 to $252,000.
- Married filing separately, covered by a plan: $0 to $10,000.
Below the low end of your range, the traditional IRA deduction is fully available. Above the high end, it’s gone. In between, a partial deduction applies. Nondeductible traditional IRA contributions and Roth IRA contributions are unaffected by this rule, though Roth IRAs have their own separate income limits.
The Roth SEP Exception
The SECURE 2.0 Act allows employers to let employees designate their SEP IRA as a Roth.11Internal Revenue Service. SECURE 2.0 Act Impacts How Businesses Complete Forms W-2 If you elect Roth treatment, the contribution is made with after-tax dollars, so it does not reduce your taxable income in the year you make it. The tradeoff is that qualified withdrawals in retirement, including all growth, come out tax-free. The Roth election has to be made before the contribution is deposited, and not every custodian currently supports the option.
The Tax Isn’t Erased, Just Deferred
A traditional SEP IRA contribution lowers your tax bill this year, but the same money will be taxed later. Withdrawals in retirement are taxed as ordinary income at whatever rate applies to you then.6Internal Revenue Service. Simplified Employee Pension Plan (SEP) For many people the retirement bracket is lower than the working bracket, which is where the net benefit comes from.
Pulling money out before age 59½ generally adds a 10% early withdrawal penalty on top of the ordinary income tax, subject to a set of statutory exceptions such as disability, substantially equal periodic payments, qualifying medical expenses, and first-time home purchases up to $10,000.12Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions So the deduction you take today is best thought of as a shift in when you pay, not whether.