Does a Cash Balance Pension Plan Require Mandatory Funding? (w/Examples) + FAQs

Yes, a cash balance pension plan requires mandatory funding. Federal law treats it as a defined benefit plan, so the employer must pay in enough each year to hit a target set by Internal Revenue Code Section 430. That amount is not the employer's to pick.

That single rule sets a cash balance plan apart from a 401(k), where a match can shrink or vanish in a lean year. Every benefit in a cash balance plan must be fully vested after three years of service, so a plan short on funding can owe real money it does not have. Owners weighing one of these plans, and workers whose employer recently set one up, both need to know how the rule works.

This article covers federal funding rules under ERISA and the tax code as of the 2026 plan year. Rates and tables used in the math change every year. Check current figures with the plan's actuary before you rely on any number here.

What a Cash Balance Plan Promises

A cash balance plan is a defined benefit plan, the same legal type as a traditional pension. It looks and feels like a 401(k) to the worker, but the law treats it in a much different manner. Each worker sees a hypothetical balance that grows each year with a pay credit, often a set share of pay, plus an interest credit tied to a fixed or index-based rate. The employer, not the worker, owns the risk, so a bad market year does not shrink the benefit owed.

That structure is exactly why the funding rule exists. The benefit is a legal promise, not a running balance the worker can watch rise and fall with the market. So the employer must set aside real plan assets to cover it, checked each year against a target. A Department of Labor fact sheet confirms cash balance plans are defined benefit plans, usually insured by the Pension Benefit Guaranty Corporation, the agency that steps in when a firm cannot pay.

Employers cannot pull paid-in money back out of the trust once it goes in. The one exception is a plan that ends with assets left over after every promised benefit is paid. A firm that pays in extra during a strong year cannot simply pull the extra cash back out the next time money is tight. That locked-in flow is why the IRS treats the yearly funding math as a firm rule, not a choice.

Workers get an annual benefit statement showing their hypothetical balance, but that number is a bookkeeping entry, not a set-aside pot of money held only for them. All plan assets sit together in one pooled trust that backs every worker's benefit at once. This pooled setup is why the plan-wide target, not any one worker's balance, drives what the employer owes each year.

Why Funding Is Mandatory, Not Optional

Congress built this rule into federal law on purpose. The Employee Retirement Income Security Act, known as ERISA, set minimum funding rules for defined benefit plans back in 1974. The Pension Protection Act of 2006 made those rules tighter, and the new funding math took full effect for plan years starting in 2008. Cash balance plans get no pass from either law.

They follow the same funding path as a traditional pension. That path sits in IRC Section 430 on the tax side, and its match at ERISA Section 302 on the labor side. Both sections make the plan's actuary set a funding target each year, the value today of every benefit earned so far. The actuary then checks that target against the plan's real assets.

If assets fall short, the employer owes a minimum required contribution for the year. That payment is due within eight and a half months after the plan year ends. A common myth is that a small or closely held firm can simply skip the payment in a slow year, as it might skip a bonus. That belief is wrong, and it is the costliest mistake a first-time plan sponsor can make in a downturn.

The payment is a legal duty backed by the IRS and the Department of Labor. It is not a bonus the employer can choose to skip. Ignoring the rule does not bring a gentle warning letter. It brings a tax that starts to build right away, benefit limits that trigger with no hearing, and, in the worst cases, a plan closing the employer does not control.

The plan's actuary files a form called Schedule SB with the plan's yearly Form 5500, reporting the funding target and the payment made. That filing is how the IRS and Department of Labor check that a sponsor met its funding duty. A missing or late Schedule SB draws its own fine, apart from any funding gap the form might reveal.

How the IRS Calculates the Minimum Required Contribution

Each year, the plan's actuary runs a funding check. The actuary sets the funding target using worker data, a rate table the IRS posts each month, and standard life-span tables. The check also gives the target normal cost, the value of the new benefits workers earned this year alone. Together, these two numbers set the base line the plan's assets get measured against.

If plan assets already top the funding target, the required payment can drop to zero. Some well-funded plans go a full year with no payment due at all. If assets fall short, the law does not force the employer to close the whole gap at once. It lets the employer spread the gap over seven years, which turns what could be a painful one-year hit into a steady yearly cost.

A plan that sits well under 80% funded also owes quarterly payments during the year. It cannot simply wait until the 8.5-month deadline to pay. Cash flow planning has to start well before the actuary even finishes the year's check, most of all for a firm with tight margins.

A Worked Funding Example

Picture a small engineering firm that runs a cash balance plan for its four owners and twelve staff. The actuary's check shows a funding target of $2,400,000 for the plan year. Trust assets sit at $2,150,000, leaving a gap of $250,000. Target normal cost for benefits earned this year alone adds another $180,000 on top.

Spread over the standard seven-year schedule, the $250,000 gap adds close to $41,700 a year to the required payment. Add the $180,000 target normal cost, and the firm's required payment lands near $221,700 for the year. That sum is due within eight and a half months of the plan year's close. If the firm's plan sits below the 80% funded line, part of that sum also has to arrive as quarterly payments instead of one year-end check, a detail the owner needs from the actuary well before the fiscal year ends.

What Happens If a Plan Falls Behind on Funding

Missing the required payment creates an accumulated funding deficiency, a legal term for an unpaid funding gap. IRC Section 4971 puts a tax on that gap right away. The first tax runs 10% of the gap, owed by the employer no matter the reason, even if no one noticed the gap at the time. If the gap stays unpaid, the tax can climb to 100% of what remains, a fine steep enough that most actuaries treat it as a line no sponsor can afford to cross.

A funding gap also limits what the plan can pay out while it stays short. Under IRC Section 436, a plan whose funded ratio, called AFTAP, drops below 80% cannot pay a lump sum bigger than half of what it would normally owe. A plan below 60% AFTAP cannot pay any lump sum at all. New benefits stop building once a plan's AFTAP falls under 60%, so workers stop earning new pay credits until funding comes back.

These limits surprise workers more than they surprise employers. A worker who expected a full lump-sum payout can be told, with little warning, that the plan can only pay half, or nothing, until funding improves. A well-run plan avoids this by having the actuary flag a falling AFTAP a year or more ahead of time. That warning gives the employer room to add cash before the 80% or 60% lines get crossed, instead of learning the bad news at the yearly check when it is too late to plan around it.

A missed payment that leaves an unpaid balance over $1,000,000 also becomes a lien in favor of the plan under IRC Section 430, one the plan can enforce against the employer's other business assets. Large or repeated funding gaps can also draw closer review from the PBGC as the agency that backstops the plan. That lien is one more reason sponsors treat a missed payment as a legal problem, not only a cash flow problem.

Which Situation Applies to You?

The funding rule looks different depending on who is asking. Match your case below before you assume a rule fits you the same as it fits someone else. Three common cases follow: the solo owner, the mid-sized firm, and the worker in someone else's plan.

The solo owner with a one-person plan

A single-owner shop, a dentist or a solo lawyer, often sets up a cash balance plan because the payment limit runs far higher than a 401(k)'s. For an older owner, that limit can top $300,000 a year. The catch is that the full payment is required once the plan starts, set fresh each year by an actuary. It does not shrink because revenue had a rough year, and anyone in this spot should ask the actuary to model a weak-revenue year before signing the plan papers.

Most solo plans also pair the cash balance plan with a 401(k) profit-sharing plan to grow total savings. That pairing raises the yearly cost of actuary work, often a few thousand dollars, on top of the required payment itself. A solo owner should budget for both costs together, not only the headline payment figure, before signing off on the plan.

The mid-sized professional firm

A firm with 20 to 75 workers layering a cash balance plan on top of a 401(k) faces the same required rule, but with less room to move. The payment has to cover every eligible worker's pay credit, not only the owners'. A bad year can force the quarterly-payment rules above while payroll and other fixed costs keep running all the same. This group gains the most from a check-in with the actuary through the year, not only at year-end, so a gap never lands as a surprise.

Firms this size often set the pay credit in tiers, giving owners and senior partners a bigger share than staff. That design keeps the total funding cost in check while it still gives a real benefit to every eligible worker. An actuary can test a few tier plans side by side before the firm locks in the plan papers.

The worker whose employer sponsors the plan

A worker usually has no funding choice to make, but the plan's health still counts. It counts most near a job change or a coming retirement. Ask the plan office for the latest AFTAP rate before you assume a payout will come in full, since a plan under 80% funded can pay out only part of it by law. The DOL's cash balance FAQ confirms earned benefits stay owed even through a plan change, but the timing and form of pay can still be limited by the funding rules above.

ERISA also makes the plan send workers a yearly Funding Notice that states the plan's funded rate. Reading that notice each year is the simplest method for a worker to track plan health without asking HR direct. A funded rate that keeps dropping over several years is worth raising with the plan office well before a planned retirement date.

How Funding Decisions Play Out for Three Employers

The rules above read differently once real numbers enter the picture. Each case below teaches a distinct lesson, not the same math from a new angle. Together, they cover a missed payment, a smoothing choice, and a plan closing, three separate spots where the funding rule bites hardest.

The dental office that missed a quarterly payment

Dr. Patel's five-worker dental office set up a cash balance plan in 2022 with strong early funding. A slow 2025 dropped the plan below 80% AFTAP by midyear. The plan's actuary had already flagged the quarterly-payment rule, but the office's bookkeeper treated the first quarterly sum like an optional transfer and pushed it back ninety days while cash was tight.

That delay alone brought a late-fee charge on top of the gap. It came on top of the tax risk the office was already facing. By the time the fourth quarter arrived, what began as a small gap had grown into a much bigger, harder problem for the office to fix on its own.

The engineering firm that used the seven-year smoothing rule

The engineering firm from the earlier example chose to spread its $250,000 gap over the full seven-year window. It did not pay the gap off in one lump sum. That choice kept the firm's yearly cash outlay steady at close to $221,700, instead of a single-year spike near $430,000. The firm's controller had never planned for a pension gap before and praised the actuary for raising the option early.

The point here is not that a gap can be avoided. It is that the smoothing option exists so a short market dip does not force a rushed payment the firm cannot absorb. Spreading the cost let the firm keep hiring and buying gear while it paid the gap down over time. A single-year payment of that size would have forced layoffs the smoothing option made needless.

The consulting firm that closed an overfunded plan

A twelve-partner consulting firm closed its cash balance plan after a decade of strong markets left the trust holding more assets than the target required. Every promised benefit was paid in full before any assets went back to the firm. That order avoided the funding-gap problem entirely, since paying benefits first is a legal must for any plan closing, over-funded or not.

But the firm found a separate tax applies to leftover assets that flow back to the firm at closing. The firm's actuary and ERISA counsel spread the wind-down over two tax years to manage that tax risk. It is a step a sponsor only needs once, at closing, unlike the yearly funding cycle the other two firms lived through each single year. Partners who expected a quick final payout learned the closing process itself took close to a full year to finish right.

Comparing Funding Obligations Across Plan Types

Cash balance plans are not the only retirement option a firm can offer. The funding rule is the clearest line that sets them apart. A firm picking between plan types needs to see that line before it settles on a design.

A traditional pension and a cash balance plan share the same Section 430 funding math, but they differ in how the benefit reads to the worker. A traditional pension quotes a monthly check at retirement, which can feel far off to a young worker decades away from collecting it. A cash balance plan quotes a running dollar balance instead, which is often easier for a worker to picture and weigh across job offers.

The table makes the core answer to this article's question plain in one row. A cash balance plan and a traditional pension share the same required funding rule. A 401(k) has no such rule to compare it to at all. That is also why a cash balance plan suits a firm that wants a bigger, steady benefit and can commit to funding it each year.

The payment-limit gap matters most for an owner who must pick between plan types. A 401(k) alone caps the owner's own tax-deferred savings at a small share of what a cash balance plan allows, which is why many small, profitable firms stack a cash balance plan on top of an existing 401(k) instead of picking one or the other. That mix lets the firm fund a much bigger benefit while it keeps the 401(k)'s open choice for the rest of the staff.

Mistakes to Avoid

• Treating the contribution as optional in a bad year. The minimum required contribution is a legal obligation, and skipping it starts the Section 4971 excise tax clock right away.
• Ignoring the quarterly-installment rule once a plan drops below 80% funded. Late quarterly payments add interest charges on top of an already-growing shortfall.
• Waiting for the annual valuation to reveal a funding problem. A mid-year check-in with the actuary can catch a falling AFTAP before it crosses the 80% or 60% lines.
• Assuming a lump-sum rollover will be paid in full no matter what. A plan under 80% AFTAP can legally cap lump sums at half, and one under 60% cannot pay one at all.
• Adopting a cash balance plan without modeling a down-revenue year first. The pay credit and required contribution do not shrink automatically when business slows.
• Confusing the seven-year amortization option with permission to skip a payment. Smoothing spreads the shortfall over time; it does not erase the current year's required contribution.
• Ending an overfunded plan without planning for the reversion excise tax. Leftover assets returning to the employer trigger a separate tax that needs its own strategy.
• Hiring a payroll provider instead of an enrolled actuary for the valuation. Only a credentialed enrolled actuary can certify the Schedule SB filing the IRS requires.

Do's and Don'ts for Cash Balance Plan Funding

Do

• Get a funding projection before adopting the plan. An actuary can model a weak-revenue year so the mandatory contribution never comes as a surprise later.
• Track the plan's AFTAP through the year, not only at the annual valuation. Early warning gives the employer time to add contributions before restrictions trigger.
• Set aside cash for the required contribution as a fixed line item. Treating it like payroll, instead of a bonus pool, keeps the deadline from sneaking up.
• Ask the actuary about the seven-year smoothing option if a shortfall appears. It turns a painful lump-sum hit into a predictable annual number instead.
• Bring in ERISA counsel before ending an overfunded plan. The asset-reversion excise tax has planning options that only work if set up before termination begins.

Don't

• Don't treat the funding contribution as something the business can defer forever. The IRS excise tax accrues automatically, with or without a warning notice.
• Don't assume a 401(k)'s flexible-match mindset applies here. Cash balance funding is a legal requirement tied to a formula, not a discretionary employer choice.
• Don't skip a quarterly installment because the year-end deadline still looks far off. Plans below 80% funded owe those payments quarterly, not only once a year.
• Don't rely on a general accountant instead of an enrolled actuary for the valuation. The funding calculation and required government filings need actuarial certification.
• Don't promise employees a full lump-sum payout without checking the current AFTAP. A funding-based restriction can legally reduce or eliminate that payout no matter what was promised earlier.

Pros and Cons of Cash Balance Plan Funding Obligations

Pros

• Predictable, guaranteed benefits for employees. Because the employer bears investment risk, participants know their balance will not shrink in a down market.
• Very high contribution limits for owners nearing retirement. A cash balance plan lets an older owner shelter far more income than a 401(k) alone allows.
• Federal insurance backstop through the PBGC. Most private-sector cash balance plans carry PBGC coverage as defined benefit plans, guarding participants if the employer fails.
• Forced savings discipline for the business. The mandatory contribution keeps retirement funding from being the first budget line cut in a tight year.
• Fast vesting for participants. Full vesting after three years of service means employees do not have to stay a decade to keep their earned benefit.

Cons

• No flexibility to skip a contribution in a bad year. Unlike a 401(k) match, the funding requirement does not adjust downward when revenue drops.
• Excise tax exposure for underfunding. A missed or late required contribution starts a Section 4971 tax clock that can escalate fast.
• Actuarial costs add up every year. The annual valuation, Schedule SB filing, and PBGC premium work all require paid professional time.
• Benefit restrictions can freeze payouts without much warning. A falling AFTAP can cap or eliminate lump sums for departing employees mid-year.
• Ending the plan is more complex than closing a 401(k). Winding down an overfunded plan raises a separate excise tax on assets that revert to the employer.

What to Do Next

1. Ask the plan's enrolled actuary for the current funding target, plan assets, and AFTAP percentage before assuming the plan is fully funded.
2. Confirm whether the plan sits above or below the 80% AFTAP threshold, since that determines whether quarterly installments and lump-sum limits apply.
3. Build the minimum required contribution into the business's cash flow plan as a fixed obligation, not a year-end guess.
4. If a shortfall exists, ask the actuary to model both a lump-sum contribution and the seven-year amortization option before deciding.
5. Bring in ERISA counsel or a qualified benefits attorney if the plan is underfunded, being amended, or heading toward termination, since the excise tax and reversion rules carry real legal exposure.

Frequently Asked Questions

Is a cash balance plan the same as a 401(k) for funding purposes?

No. A cash balance plan is a defined benefit plan with a mandatory, actuary-calculated funding rule, while a 401(k) employer match or profit-sharing contribution stays entirely discretionary.

What happens if an employer simply cannot afford the required contribution?

The shortfall becomes an accumulated funding deficiency. That triggers an excise tax under IRC Section 4971, starting at 10% and rising if left uncorrected, so the employer should contact its actuary and ERISA counsel right away.

Does the PBGC insure cash balance plans like it insures traditional pensions?

Generally, yes. Most private-sector single-employer cash balance plans carry PBGC insurance as a defined benefit plan, unlike a 401(k), which carries none, though exact guarantee amounts depend on plan-specific facts an actuary can confirm.

How often does a cash balance plan need a funding valuation?

Every plan year. The enrolled actuary certifies a new funding target, target normal cost, and AFTAP each year, and that figure sets the minimum required contribution for the year ahead.

Can a small business owner use a cash balance plan for only themselves?

Yes, for a one-person or family business. The mandatory funding rule still applies in full, and the actuary must certify a valuation every year even with a single participant.

What is the AFTAP, and why does it matter to funding?

The Adjusted Funding Target Attainment Percentage is the plan's funded ratio. It decides whether the plan can pay full lump sums, must restrict them, or must freeze accruals under Section 436.

Are cash balance plan contributions tax-deductible for the business?

Yes, within IRS limits. Contributions made to meet the minimum required contribution are generally deductible as a business expense, subject to the deduction limits the IRS sets for pension plans.

What happens to plan funding if the business is sold or closes?

The plan typically terminates. The employer must bring it to a funded status the PBGC accepts before benefits can be paid out and the plan wound down.

Do employees ever have to contribute to fund a cash balance plan?

No. Cash balance plans are entirely employer-funded, and employees do not contribute to meet the funding rule, though some plans allow separate voluntary contributions.

How does the seven-year amortization rule reduce the yearly burden?

It spreads a funding shortfall over seven years instead of one lump sum. That turns a large one-time cash requirement into a smaller, predictable annual addition to the required contribution.

Can an underfunded cash balance plan still pay any lump sum at all?

It depends on the AFTAP. A plan between 60% and 80% funded can pay up to half of a requested lump sum, while a plan below 60% funded cannot pay one at all.

Who calculates the minimum required contribution each year?

An enrolled actuary, a credential regulated by the Joint Board for the Enrollment of Actuaries, runs the valuation and certifies the figures the IRS requires on the plan's Schedule SB filing.

Do state laws add funding rules on top of the federal ones?

No. ERISA generally preempts state law for private-sector qualified retirement plans, so the funding rule in this article applies evenly across every state, unlike wage and leave rules, which vary by location.