Quick answer: Traditional SEP IRA employer contributions are generally deductible within annual limits. A sole proprietor or partner deducts the contribution for self on Schedule 1 rather than Schedule C, while contributions for common-law employees are business deductions. Roth SEP employer contributions are generally taxable to the participant and use different reporting.
This guide translates the controlling rule into filing and recordkeeping steps. It reflects official material available on August 17, 2026. Tax-year forms, software features, state rules and agency procedures can change, so use the instructions for the exact year and transaction involved.
At a glance
| Question | Practical answer |
|---|---|
| Who this applies to | Employers and self-employed people maintaining a SEP |
| What this does not cover | Regular IRA deductions, employee elective deferrals in a new SARSEP, or unlimited owner-only contributions |
| Where it is handled | The business return for employee contributions and Schedule 1 for a sole proprietor's or partner's own contribution |
How the rule works
Start by identifying the legal character of the payment, account, credit, deduction, benefit or loan. A marketing label does not control the tax result. Dates, ownership, business purpose, filing status, income limits, residency and documentation can turn a superficially similar situation into a different answer.
- For 2026, the SEP contribution limit is generally the lesser of 25% of eligible employee compensation or $72,000, with a $360,000 compensation cap.
- A self-employed person's effective maximum rate is generally 20% of adjusted net earnings because the contribution calculation is circular.
- If an employer contributes, most SEP documents require the same percentage of compensation for every eligible participant.
- Contributions for a year can generally be made by the business return due date, including extensions.
- Nondeductible excess contributions can trigger a 10% excise tax and a later-year deduction carryover analysis.
Practical example
A sole proprietor has no employees and calculates adjusted net earnings under Publication 560. A stated 25% SEP formula does not mean 25% of Schedule C net profit; the reduced-rate worksheet generally produces a 20% self-employed rate before the annual dollar limit. The deduction goes on Schedule 1.
This example isolates the principal rule. It is not a complete return calculation: phaseouts, other credits, state conformity, related-party rules, passive-loss limits and prior-year carryovers may change the outcome.
Step-by-step checklist
- Confirm the SEP document and eligible employees.
- Calculate compensation and adjusted self-employment earnings.
- Apply the percentage and annual dollar limits.
- Fund by the applicable extended due date.
- Report traditional, Roth and excess amounts correctly.
Reconcile the result to the actual return, notice, lender disclosure or benefit statement before signing. Preserve the source documents, calculations and proof of submission; a software interview or account screen is not a substitute for evidence.
Records to keep
Keep the filed forms and schedules together with receipts, statements, contracts, account records and correspondence that establish amount, date, ownership and purpose. For an asset, credit or carryforward that affects later years, retain the origin-year worksheet through the final disposition or use year and the applicable limitation period.
Common mistakes to avoid
- Deducting the owner's SEP on Schedule C.
- Contributing only for the owner while excluding an eligible employee.
- Using 25% of raw Schedule C profit for the owner's maximum.
Correct an issuer or agency error through the documented correction process rather than silently changing a reported amount. When the dollars are material, a notice deadline is close, or the facts involve more than one jurisdiction, obtain advice from a credentialed professional who can review the complete record.
Related NavajoTax guides
Continue with employer contribution carryforward, QBI guaranteed payments. These related pages explain connected rules, but the current official form or agency instruction controls the transaction you actually report.
Frequently asked questions
What is the 2026 SEP maximum?
The maximum contribution is generally $72,000, also limited by compensation and plan rules.
Can a SEP be funded after December 31?
Yes, employer SEP contributions for the prior year can generally be made by the return due date including extensions.
Does a SEP contribution reduce self-employment tax?
An owner's Schedule 1 deduction reduces income tax but does not reduce Schedule C net earnings used for self-employment tax.
Sources reviewed
Last reviewed: August 17, 2026. This article provides general educational information, not individualized tax, legal, investment, lending or benefits advice.