Are SEP IRA Contributions Pre-Tax or Post-Tax?

Yes, SEP IRA contributions are pre-tax by default. The employer deducts the contribution as a business expense, the employee owes no income tax on it in the year it’s made, and the money grows tax-deferred until it comes out in retirement.¹ The SECURE 2.0 Act added one exception: participants can now elect to treat contributions as after-tax Roth contributions instead, paying tax now in exchange for tax-free withdrawals later.²

How the Pre-Tax Treatment Works

When an employer funds a traditional SEP IRA, the contribution never touches the employee’s paycheck and never shows up as taxable wages for the year. The business writes the check, deducts the amount from its taxable income, and the employee’s W-2 wages are unaffected.¹ Inside the account, dividends, interest, and capital gains accumulate without annual tax. The IRS collects when you take distributions.

Where the deduction lands on the return depends on the business. Corporations and partnerships deduct SEP contributions on the business return itself. A sole proprietor or single-member LLC deducts contributions to their own SEP on Schedule 1 of Form 1040, which reduces adjusted gross income directly. The deduction does not belong on Schedule C alongside other business expenses.³ Either way, the tax outcome is the same: the contribution reduces taxable income for the year it’s made.

The pre-tax deduction has a ceiling. For 2026, the employer can contribute up to the lesser of 25% of compensation or $72,000 per participant, and the 25% calculation counts only the first $360,000 of compensation.⁴⁵ Amounts above that cap are not eligible for the pre-tax treatment described here and can trigger the excise taxes discussed below.

One boundary to keep in mind: when an employer sets a contribution percentage, it must apply to every eligible employee at that same rate, not just to the owner.⁶ The pre-tax deduction the business claims for the owner’s contribution is tied to funding everyone else at the same rate.

The Roth SEP Election Flips the Timing

Since SECURE 2.0, SEP plans may offer a Roth option, and this is the one situation where SEP contributions are not pre-tax.² The mechanics reverse: the employer still routes the money to the participant’s IRA, but the contribution is included in the employee’s gross income for that year. Tax is paid now. Later, qualified withdrawals of contributions and earnings come out tax-free.

Roth treatment isn’t automatic. The employee has to affirmatively elect it; the employer can’t make the designation for them. And there’s a quirk worth planning around: Roth SEP contributions count as taxable income but are not subject to FICA or FUTA withholding, so the extra tax owed never shows up on a paycheck. Anyone electing Roth should adjust withholding or make estimated payments to avoid a bill at filing time.

For a self-employed person, the trade-off is the same one every Roth conversion presents. Pay tax on the contribution at today’s rate, or defer and pay at your rate in retirement. If your current bracket is low relative to what you expect later, the Roth election tends to win; if the reverse, the traditional pre-tax route usually does.

When the Tax Comes Due

Because traditional SEP contributions escape tax on the way in, they’re fully taxed on the way out. Distributions from a pre-tax SEP IRA are ordinary income in the year you receive them.⁷ No capital gains rate applies, no matter how the account grew. Every dollar withdrawn is added to that year’s taxable income at your ordinary rate.

Take money out before age 59½ and the tax gets worse. A 10% additional tax stacks on top of ordinary income tax on the distribution.⁸ The IRS lists exceptions that waive the 10% penalty (disability, death, substantially equal periodic payments, unreimbursed medical costs above 7.5% of AGI, health insurance premiums after extended unemployment, higher education, up to $10,000 for a first home, IRS levy, reservist call-up, up to $5,000 for birth or adoption, domestic abuse victim distributions, and a $1,000 annual emergency personal expense), but the underlying income tax on a pre-tax distribution is still owed.⁹

You also can’t defer forever. Once you reach age 73, required minimum distributions must start. Your first RMD is due by April 1 of the year after you turn 73; every one after that is due by December 31.¹⁰ Delaying that first RMD into the following calendar year means two taxable distributions land in the same tax year, which can push you into a higher bracket. Roth IRAs, by contrast, carry no lifetime RMDs for the account owner, so participants who convert SEP funds to a Roth IRA eliminate the RMD obligation on the converted amount (though the conversion itself is taxable in the year it happens).¹¹

When Contributions Exceed the Pre-Tax Limit

The pre-tax treatment only shelters contributions up to the annual cap. Anything above it is an excess contribution, and the IRS imposes a 6% excise tax on the excess for every year it stays in the account.¹² That 6% recurs annually until you fix it.

The clean fix is to withdraw the excess plus any earnings on it before the due date of your federal return (including extensions).¹ The employer can also face a separate 10% excise tax on nondeductible contributions, so running the contribution math carefully before funding matters on both sides of the transaction.

1
Internal Revenue Service. Retirement Plans FAQs Regarding SEPs
2
Internal Revenue Service. SECURE 2.0 Act Changes Affect How Businesses Complete Forms W-2
3
Internal Revenue Service. Self-Employed Individuals – Calculating Your Own Retirement Plan Contribution and Deduction
4
Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs)
5
Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living
6
Internal Revenue Service. Simplified Employee Pension Plan (SEP)
7
Office of the Law Revision Counsel. 26 USC 408 – Individual Retirement Accounts
8
Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts
9
Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
10
Internal Revenue Service. Retirement Topics – Required Minimum Distributions (RMDs)
11
Internal Revenue Service. Rollover Chart
12
Office of the Law Revision Counsel. 26 USC 4973 – Tax on Excess Contributions to Certain Tax-Favored Accounts and Annuities