Roth SEP vs Traditional SEP IRA: Which One Fits Your Business?

The question that shows up every year

It is November. Business has been good, and your accountant says you have room to put real money into a retirement plan before the year ends. You open your SEP IRA paperwork and see a choice that did not exist a few years ago: take the tax benefit now, or go Roth.

Both paths put the same dollars into the same kind of account. What changes is the day you send the IRS its share.

This post walks through three business owners who made different choices for good reasons. By the end, you will know which story sounds most like yours.

The one thing that does not change

A Roth SEP IRA is not a new kind of plan. It is a Roth IRA designated to receive employer contributions made through a SEP arrangement. That means the rules around the plan stay familiar:

• The regular SEP contribution limits apply, not the lower personal Roth IRA limits.
• For 2026, the maximum is the lesser of 25% of eligible compensation or $72,000, with compensation counted up to $360,000.
• Self-employed owners use a special calculation based on adjusted net earnings from self-employment.
• An employer that contributes for itself must contribute for eligible employees under the same allocation rules.

If you want the full rundown of how Roth SEP works, start with our guide to the Roth SEP IRA.

The one thing that does

Traditional SEP IRA: The contribution is generally excluded from your current taxable income. Your investments grow tax-deferred, and withdrawals are generally taxed as ordinary income.

Roth SEP IRA: The contribution is included in your taxable income for the year it is deposited. If the Roth IRA requirements are later satisfied, qualified withdrawals, including earnings, can be tax-free. Roth owners are also not required to take minimum distributions during their lifetime.

One timing detail is easy to miss. A contribution may relate to the business's prior tax year, but Roth income recognition generally happens in the tax year the contribution is deposited. Plan your cash flow around the deposit date, not just the year you are saving for.

Three example owners

The numbers below are illustrations, not predictions. We use a 6% annual return over 20 years, ignore state taxes and fees, and use a flat tax rate for each owner to keep the math readable. Your real results will differ.

Example 1: The owner in a lean year

A consultant started a design business two years ago. This year was slower than usual because of startup costs, so the owner sits in the 12% bracket. They expect the business to grow, and they expect to be in the 24% bracket by retirement. They put $30,000 into a SEP IRA.

• Roth path: About $3,600 in tax this year (12% of $30,000). If everything grows at 6% for 20 years, the account reaches about $96,200, and qualified withdrawals can be tax-free.

• Traditional path: No tax this year. The same $96,200 would be taxed as ordinary income at withdrawal. At 24%, that is about $23,100.

This owner is paying a low rate today to avoid a higher rate later. For a situation like this, Roth is worth a serious look.

Example 2: The owner at peak earnings

A contracting company owner is in the highest-earning stretch of their career and sits in the 35% bracket. They expect to scale back before retirement and land in the 24% bracket. They put $50,000 into a SEP IRA.

• Roth path: About $17,500 in tax this year (35% of $50,000). The account grows to about $160,400, with qualified withdrawals potentially tax-free.

• Traditional path: No tax this year, and the $17,500 stays available for the business or other uses. At 24%, the withdrawal tax on $160,400 is about $38,500.

This owner would be paying a high rate now to avoid a lower rate later. For a situation like this, the traditional SEP IRA often makes more sense.

Example 3: The owner who wants both options open

A small marketing agency owner has a few employees. Their rate today and their expected rate in retirement are both around 24%. They are considering the maximum $72,000 contribution and have plenty of cash on hand to cover taxes.

• Roth path: About $17,280 in tax this year (24% of $72,000). The account grows to about $230,900, with qualified withdrawals potentially tax-free.

• Traditional path: No tax this year. At 24%, the withdrawal tax on $230,900 is about $55,400.

When the rate today and the rate later match, the choice is less about a tax-rate bet and more about practical questions. Can this owner pay the Roth tax from outside funds without stress? Does tax-free money and no required minimum distributions later matter? Would a mix of traditional and Roth assets add flexibility? Those answers decide it.

The three examples side by side

A word of caution about reading this table. The traditional column shows a bigger tax number because it taxes the growth too. That does not make Roth the winner by default. The traditional owner also keeps the money that would have gone to taxes this year, and what they do with it matters. The comparison that counts is your rate now against your rate later, and where the tax money for a Roth contribution comes from.

What these examples leave out

Real life is messier than a flat-rate example. Before you choose, think through these:

• Your bracket may shift. A Roth contribution adds to your taxable income for the year. A $30,000 contribution could push part of your income into a higher bracket, so the real cost in Example 1 may be above $3,600.
• Other tax rules may be affected. Higher income can influence credits, deductions, and other income-based provisions.
• State taxes count. If you move to a state with a different income tax, the comparison can change.
• Estimated taxes. A larger income this year may call for adjusting your estimated tax payments.
• Time horizon. The longer the money stays invested, the more the tax-free growth of a Roth account can matter.
• Rates can change. Nobody knows what tax rates will look like in 20 years.

Because the added tax is due on a contribution that you never see as cash, it also helps to plan how you will pay it before you make the election.

A quick way to think it through

A Roth SEP IRA may be worth considering when:

• You expect your tax rate to be higher in the future.
• You have many years before retirement.
• You want both traditional and Roth assets for greater tax flexibility.
• You prefer not to take lifetime required minimum distributions from the Roth account.
• You have enough cash outside the retirement account to cover the current tax.

A traditional SEP IRA may remain attractive when:

• Reducing your current taxable income is a priority.
• Your business has a particularly profitable year.
• You expect to be in a lower tax bracket during retirement.
• Paying the tax on a large Roth contribution would strain your cash flow.

A reason to say no

Skipping the Roth option is a perfectly good decision. If this year's tax bill matters more than the tax you might pay decades from now, the traditional SEP IRA exists for exactly that reason. If you are not sure you can cover the added tax without dipping into the plan money, wait. You can revisit the choice next year.

The point is not to pick the fancier option. It is to pick the one you can live with.

Where to go from here

Most owners find the choice clearer once they see their own numbers beside someone else's. Take the three examples, swap in your own rates and your contribution, and see which one fits.

If you want a second set of eyes, WealthRabbit can help you set up either type of SEP IRA digitally, and a qualified tax professional can help you compare the immediate tax cost with the long-term benefit.

About the Author

Jason Ackerman, CPA, CFP®

Co-Founder & CEO at WealthRabbit

Jason Ackerman is a CPA, CFP®, and CGMA, and Co-Managing Partner at BNA CPAs & Advisors, where he has helped grow the firm several times over. He brings that same growth mindset, and a healthy skepticism of unnecessary complexity, to his work as Co-Founder of WealthRabbit. That combination of hands-on CPA experience and fintech innovation shapes the WealthRabbit blog's plan-comparison guides, so business owners can make a decision without needing a CPA in the room.