A backdoor Roth IRA does not replace a pension

The individual return was due April 15, 2026, unless you extended it. In the week after that date, the conversation that shows up is always the same. Someone at a dinner says they "did a backdoor Roth," and an owner who just wrote a large check to the Treasury asks whether that technique is the sophisticated version of a retirement plan. It is not. A backdoor Roth IRA is a personal contribution to an individual retirement account, followed by a conversion. For 2026 the IRA dollar limit is $7,500, plus a catch-up of $1,100 if you are age 50 or older. A cash balance or defined benefit plan is an employer plan whose ceiling is a retirement benefit, not a $7,500 deposit. They are not substitutes. Doing the first does not mean you have outgrown the need to look at the second. Skipping the second because the first has a clever name is how high earners stay inside a small account.

Sterling Pension Group LLC in West Hartford is a third-party administrator of employer plans. We are not an actuarial firm, and we do not custody IRAs. Independent Enrolled Actuaries certify pension valuations. This briefing is not tax, legal, or actuarial advice. Your CPA decides whether a conversion is taxable. We decide nothing about your Form 8606.

What the backdoor actually is

A Roth IRA has an income limit on direct contributions. Above that income, a direct Roth contribution is not available. The workaround people call a backdoor Roth is mechanical. You contribute to a traditional IRA without claiming a deduction, which is all you can do when your income is too high for a deductible IRA or a direct Roth. You then convert that traditional IRA to a Roth IRA. If you have no other pre-tax money in any traditional, SEP, or SIMPLE IRA, the conversion of a nondeductible contribution is often close to tax-neutral, aside from earnings between the contribution and the conversion. The account then grows as a Roth, and qualified distributions can come out tax-free under the Roth rules.

That paragraph is the entire technique. It is useful. It is also small. The 2026 IRA limit of $7,500 was announced in IR-2025-111 on November 13, 2025, in Notice 2025-67. The catch-up, newly indexed, is $1,100. A 55-year-old can put $8,600 into the maneuver. Last year the IRA limit was $7,000 and the catch-up was $1,000, which is why a 2025 article you saved is already a year out of date. The IRS cost-of-living page is the table. Nothing on it turns $8,600 into a business deduction of several hundred thousand dollars.

The pro-rata rule is the part the dinner conversation skips. All of your traditional, SEP, and SIMPLE IRAs are aggregated. A conversion cannot cherry-pick the nondeductible dollars and leave the pre-tax dollars behind if those pre-tax dollars sit in any IRA in your name. If you rolled an old 401(k) into an IRA, if you have a SEP IRA from a plan you have not touched since 2019, or if a SIMPLE IRA is still open, a large share of the conversion is taxable. Basis is tracked on Form 8606. Guessing the basis is how people pay tax twice or not enough. A backdoor Roth in the presence of a large pre-tax IRA is often just a taxable conversion with extra steps.

SEP IRAs and SIMPLE IRAs count. That is the fact that ties this subject to employer plans. An owner who has been funding a SEP for years has been filling the very bucket that makes the backdoor Roth taxable. Ending the SEP, and where the document allows it, rolling the SEP IRA into a qualified plan that accepts rollovers, is sometimes how the pro-rata problem gets smaller. It is not automatic, and it is not something to do in the same week as a conversion without the CPA. The comparison of SEP, 401(k), and pension designs is the map. Read it before you convert a SEP balance "to clean things up."

What a pension actually is

A cash balance plan is a defined benefit plan. The document promises a benefit. The benefit is communicated as a hypothetical account, grown by a pay credit and an interest credit. The employer funds a trust so the promise can be paid. The legal ceiling is not the IRA limit and not the 401(k) deferral. Under section 415(b) the annual benefit at retirement age is limited to the lesser of a dollar amount and 100 percent of average compensation. For 2026 the dollar amount is $290,000. The IRS describes the reductions for early payment and for short service on its defined benefit benefit-limits page.

The contribution is whatever an independent Enrolled Actuary determines is needed to fund the benefit under the plan's formula and the funding rules. There is no flat IRS cash-balance contribution cap. A figure you saw for "age 52" was illustrative. It depended on compensation, the interest crediting rate, the retirement age, prior accruals, and whether anyone else is in the plan. It was not a published limit sitting just above the IRA limit, waiting for you to choose it instead.

The defined contribution world is the middle tier, and it is still not the backdoor Roth. The 401(k) elective deferral for 2026 is $24,500. Catch-up is $8,000, or $11,250 at ages 60 through 63. Annual additions to a defined contribution plan are limited to $72,000, and catch-up contributions sit outside that additions limit. Compensation the plan may count stops at $360,000. Publication 560 walks through these as plan limits for small businesses. A backdoor Roth uses none of them. It uses the IRA limit. Stacking a $7,500 IRA contribution on top of a maxed 401(k) is coherent. Calling the IRA contribution "my pension" is not.

Roth catch-up, which is operational in 2026, is a third Roth rule and it is not the backdoor. If your FICA wages from the employer in 2025 exceeded $150,000, your 401(k) catch-up generally has to be designated Roth. That rule applies to the 401(k) catch-up. It does not apply to cash balance pay credits, and it does not describe the IRA conversion. Final regulations tighten in 2027. This year is good-faith operational compliance. Ask the 401(k) recordkeeper whether your catch-up is running as Roth. Do not ask the pension administrator to "make the cash balance Roth" because a podcast used the word.

The dollars, side by side, without a fairy tale

Take an owner of 57 with wages at the $360,000 compensation cap and no employees, which is the cleanest picture and the one least likely to be your picture. The backdoor Roth, if it works, moves $8,600 of personal after-tax money into a Roth IRA. The 401(k) deferral can move $24,500, plus a catch-up of $8,000 because this owner is not yet in the 60-through-63 band. Employer profit sharing inside the defined contribution plan can use part of the remaining room under $72,000, subject to the document, to testing, and to the deduction rules if a pension exists alongside it. A cash balance credit is a further employer deposit, actuarially set, often illustratively in a six-figure band at this age and often not. The band is not a quotation. Staff, a lower wage, or a different interest credit moves it or erases it.

The tax character does not match either. The backdoor Roth, when the pro-rata rule is not inflaming it, is after-tax money buying Roth treatment. The cash balance contribution, when it is deductible, is an employer deduction. The benefit is taxed later as ordinary income when it is paid, unless some later rollover rule changes the character, which is a distribution question for a different year. You do not "get Roth treatment" on the pension contribution by also doing a backdoor Roth. You did two different things.

You can do both in the same year. Nothing in the IRA limit repeals the pension, and nothing in the pension repeals the IRA limit. The interaction is practical. A cash balance or defined benefit distribution that you roll into a traditional IRA becomes pre-tax IRA money. From that day, the pro-rata rule follows you into every future conversion. Owners who care about keeping the backdoor Roth clean often leave pension money in a qualified plan, or roll it to a plan that accepts rollovers, rather than into an IRA. That is a distribution-year decision. It is not a reason to skip the pension at 57 because you like the Roth at 67. Tell the CPA which accounts you already have before anyone converts anything in 2026.

A worked illustration that pretends every owner can deduct $300,000 because a table said so is the sort of result this firm will not publish. Age changes the funding math because the $290,000 benefit is an annuity ceiling and the deposit is the cost of funding it. Younger owners generally cannot support the same deposit as older owners. Employees change the test. The illustrations page is where that slope is discussed without being dressed up as a limit. The limits page is where the three statutory ceilings stay in their lanes: deferral, annual additions, and the defined benefit annuity.

Who should stop after the backdoor, and who should not

Stop after the backdoor Roth if the business cannot fund a promise for several years, if employees make a tested plan unattractive once the cost is honest, or if the compensation the plan can see is too small to support a benefit worth the administration. A sole proprietor with uneven income, or an S corporation owner whose W-2 is a fraction of the profit, often learns that the pension was never going to see the number they call "what I made." The note on when a plan is not a fit is the respectful version of no. A $7,500 Roth contribution may be the right entire answer. There is no medal for sponsoring a pension you will freeze in anger next spring.

Do not stop after the backdoor Roth merely because the IRA felt sophisticated. High W-2 wages, a stable practice, an owner in the fifties or sixties, and a staff cost you have actually seen on paper are the ordinary facts behind a cash balance conversation. The backdoor Roth can remain in the personal column while that conversation happens. Owners who already max the 401(k) and then use the IRA because "there is nowhere else to put money" have skipped the employer-plan tier in the middle. That tier is the combo of a 401(k) and a cash balance plan, and it is subject to deduction coordination. It is not a second backdoor.

One more confusion, because April produces it. A Roth 401(k) deferral inside the plan is not a backdoor Roth. It is an elective deferral, counted against $24,500, that the plan document allows to be designated Roth. It does not use the IRA limit. It does not fix a pro-rata problem in your SEP IRA. And a mega-backdoor Roth, which is after-tax employee money inside a 401(k) converted to Roth, exists only if that specific 401(k) document and recordkeeper allow after-tax contributions and the tests pass. Most small professional-practice 401(k) plans are not built that way. Do not assume yours is because a technology-company article described it.

What to do in the next two weeks

List every IRA you own. Separate Roth IRAs from traditional, SEP, and SIMPLE IRAs. Write down the pre-tax balance and the nondeductible basis you have actually reported. If you cannot find the basis, that is the first call to the CPA, before any 2026 conversion.

Then write the employer-plan column on a different page. What is the 2026 W-2 or earned income the plan can see. Did you already defer $24,500, and is any catch-up running as Roth because 2025 FICA wages exceeded $150,000. Is there a SEP still in force whose document forbids another plan. Those questions decide whether a pension is even eligible to be discussed. The IRA questions do not.

If both columns are real, bring them in together. The useful note is short: ages, entity type, IRA balances by type, current plans, and whether you want a deduction or a Roth or you have been told you cannot have both. You can often have a small Roth IRA maneuver and a pension. You cannot have the maneuver instead of the pension and call it the same thing.