A cash balance plan is not a weekend form

Sunday, September 28, 2025, is a reasonable day to decide that a cash balance plan might belong beside the practice. It is a poor day to believe the plan can be finished by Monday. The adoption paperwork is not the work. The work is the census, the entity, the compensation definition, the staff question, the interest crediting rate, the trust, and a contribution range an independent Enrolled Actuary can actually certify. None of that is a weekend form.

Sterling Pension Group is a third-party administrator and pension consultant. We are not an actuarial firm. When a number has to be signed — the minimum required contribution, the deductible maximum, Schedule SB — an independent Enrolled Actuary certifies it. This briefing is not tax, legal, or actuarial advice. It is a description of why the calendar between today and a real 2025 plan is measured in weeks.

What you would actually be adopting

A cash balance plan is a defined benefit plan that states each participant's benefit as a hypothetical account. Each year the formula credits pay, and the document credits interest. The account statement looks familiar if you have lived with a 401(k). The legal object underneath is not a 401(k). The plan promises a benefit defined by the formula. The trust's investment return can be higher or lower than the interest credit. The employer stands behind the difference. That is why the annual deposit is calculated, not elected the way a profit-sharing check is elected.

Owners look at these plans because the defined contribution ceiling is already in sight. For 2025, the elective deferral limit is $23,500. The catch-up for a participant age 50 or older is $7,500. A participant who is age 60, 61, 62, or 63 can use the higher catch-up of $11,250 instead of $7,500. The defined contribution annual-additions limit is $70,000, and catch-up contributions sit outside that dollar limit. Compensation the plan is allowed to count is capped at $350,000. The IRA dollar limit, which is a personal account and not this plan, is $7,000. Those are the figures in IRS news release IR-2024-285. They are the 2025 limits. They are already in force. They are not a worksheet you fill in on Sunday night and hand to a payroll company on Monday.

The defined benefit dollar limit for 2025 is $280,000. Read that sentence again before you treat it as a deposit. It is a cap on the annual benefit, generally expressed as a life annuity beginning at retirement age, and it is the lesser of that dollar amount and 100 percent of average compensation, with further reductions when the law requires them. The IRS explains the shape of the limit on its defined benefit limits page. There is no line on that page, and no line in the cash balance document, that says every owner may contribute one flat pension amount. Age, compensation, the interest crediting rate, years of participation, and the staff census all move the deposit. A cash balance plan is how that benefit is written so an owner can see a hypothetical balance. It is not a second 401(k) with a larger official cap.

Why the design itself takes weeks

Start with the census, because everything else waits on it. The actuary and the administrator need names, dates of birth, dates of hire, hours, ownership, family relationships, and compensation paid so far in 2025, plus a sober estimate of compensation still to be paid. "Just me" is sometimes true. It is often incomplete. A spouse on payroll, a child with summer hours, an associate who crossed 1,000 hours, a staff member you meant to keep part-time and did not: each of those facts can change coverage, the minimum participation rule that applies to defined benefit plans, and the contribution the business owes other people. If you also own, or your spouse also owns, another trade or business, the controlled-group and affiliated-service-group questions are part of the same census. They are not a footnote you add after the document is signed.

Entity type is the next week, not a checkbox. A sole proprietor is designed off earned income, and the contribution itself is part of the earned-income calculation, so the CPA and the actuary have to iterate. A partner is not designed off draws. A shareholder of an S corporation is designed off W-2 wages, not off distributions and not off the K-1. A C corporation is a different taxpayer again. If the practice is an LLC, the plan follows the tax classification, not the letters on the door. Owners lose time here by sending a broker statement and a profit-and-loss draft and assuming someone can infer the right compensation. Publication 560 is the IRS overview of small-business retirement plans, and it is worth handing to the CPA so you share a public vocabulary. It will not tell you your number.

The formula is a decision, not a default. The interest crediting rate is written into the document. It can be a fixed rate within the market-rate rules, or a rate tied to an outside index, or in some designs the actual return of plan assets. That choice changes the contribution pattern for years. It is not the same sentence as "what do we think the portfolio will earn." The portfolio is the trustee's problem. The crediting rate is the plan's promise. Choosing it casually, because a friend used five percent, is how plans become either timid or difficult to fund in a bad year.

Then there is the staff formula, if there is staff. A combo — a cash balance plan beside a 401(k) profit-sharing plan — is often the structure that lets the owner use both the defined benefit limit and the defined contribution limit. It is also a structure that has to pass coverage and nondiscrimination testing in real life, not in a brochure. The gateway, the grouping, and who is benefiting are design work. If you have no common-law employees, the testing conversation is shorter, and a self-employed cash balance plan may be the right page to start from. Shorter is not the same as instant. The document, the trust, and the actuary's first valuation still have to exist before anyone should talk about a deduction.

What cannot be repaired on the filing deadline

The SECURE Act lets many employers adopt a qualified plan as late as the due date of the employer's return for that year, including extensions, and treat the plan as adopted on the last day of the year. That rule is real. It is also the sentence people misuse when they want to start thinking about a pension in the week they file. Adoption can run that late. Design cannot start then. By the time the return is due, compensation has been paid, hours have been worked, and the facts the formula needed are already history. A document signed in that final week, with no census and no actuarial feasibility work behind it, is a signature. It is not a plan you should rely on.

Elective deferrals are the hard edge of that distinction. A 401(k) deferral election generally has to be in place before the compensation is currently available. You cannot look back in March at wages already paid in 2025 and declare that some of them were deferred. If a 401(k) and cash balance combo is part of what you want for this year, the deferral piece has to be turned on for payrolls that have not yet been paid. On September 28, there are still payrolls left in 2025 for many owners. There are not as many as there were in June. If your W-2 wages for the year are already fully paid, the deferral conversation for 2025 is probably over, even if an employer contribution for a pension or a profit-sharing allocation can still be designed and deposited later.

Employer money and employee deferrals follow different clocks, and owners blend them. A cash balance pay credit is employer money. It is not a deferral, and it is not a catch-up. The deposit of that employer contribution, for deduction purposes, can often wait until the tax-return deadline, including extensions, if the plan is properly in place for the year. The legal minimum funding contribution for a calendar-year defined benefit plan is generally due 8.5 months after year-end, which is September 15 of the following year. The Form 5500 for a calendar-year plan is generally due July 31, with an extension to October 15. Those three dates do three different jobs. None of them is a substitute for designing the plan while the year is still open enough to implement it. The Department of Labor's Form 5500 filing page is the reporting home for the annual return. It will not design the formula either.

The people, and the order they have to work in

You do not need four firms in the room on day one. You do need them in the right order, and you need to know which job is whose. Sterling can gather the census, coordinate the design conversation, prepare administration, and keep the annual cycle moving after the plan exists. The independent Enrolled Actuary runs the valuation and certifies the numbers the IRS and the CPA will actually rely on. Your CPA decides how a deductible contribution lands on the return of the right taxpayer. If a 401(k) is already at a brokerage or a payroll-bundled recordkeeper, that provider controls deferral elections, notices, and the account the employee money goes to. If those parties are introduced to each other in December, the limiting factor is no longer the tax law. It is the queue.

PBGC coverage is one of the questions that has to be asked during design rather than assumed. Coverage is plan-specific. Some plans that cover only substantial owners are exempt. Some plans maintained by a professional-service employer with 25 or fewer active participants are exempt. Plenty of closely held businesses are neither, or are close enough to the line that a junior partner, a spouse, or a second entity changes the answer. Premiums, if the plan is covered, are a real cost. The Pension Benefit Guaranty Corporation's coverage guidance is the place to start that question. It is not a conclusion you should borrow from a colleague whose practice looks like yours from the outside.

The trust is a practical week of its own. The plan needs an employer identification number, a custodian, and an account that can receive a contribution. Know-your-customer reviews are slower in the fourth quarter. An interest crediting rate still has to be chosen before anyone pretends the brokerage's model portfolio is the plan. After the plan exists, the work does not stop at the first deposit. Valuations, filings, and amendments are the ordinary year, which is what the plan lifecycle page is for. Fees for administration, actuarial certification, and recordkeeping are different invoices. If you want to see how those roles split before you start, read fees and who does what and then ask, rather than assuming one retainer covers the actuary's signature.

There is still time, on September 28, to do this properly for 2025 if the facts are clean and the work starts now. There is not time to treat it as a form you complete after you see the CPA in March. If the only goal is a larger deductible deposit, and the census, the entity, or the staff picture is messy, the honest answer may be that 2025 is the year you get ready and 2026 is the year the plan runs. That is a better outcome than a document nobody can certify.

What to do in the next two weeks

Send a census, not a concept. Names, ages, hire dates, hours, ownership percentages, and 2025 compensation paid to date, for every business you or your spouse own. Attach the entity's tax classification and the most recent payroll register. If a 401(k) already exists, send the adoption agreement and ask that provider, in writing, whether elective deferrals can still be started on compensation that has not yet been paid. Do not assume a cash balance signature repairs a deferral that was never elected.

Ask your CPA which taxpayer would claim the deduction, and whether the return for 2025 is likely to be extended. Put September 15, 2026 on the calendar as a funding date you do not yet have a number for, so it is not a surprise later. Then start the design conversation with the actual census in hand. Two weeks from today is October 12. That is enough time to learn whether a 2025 plan is realistic. It is not enough time to begin from a blank page if you wait until then.