Pension accounting under GAAP and ERISA runs on two parallel tracks: ASC 715 tells a company how to measure its defined benefit obligation and pension cost for the financial statements, while ERISA and the Internal Revenue Code separately dictate how much cash the sponsor must put into the plan each year. The two systems use different discount rates, different asset values, and different cost methods, so a company can be fully current on its required contributions and still carry a large pension liability on its balance sheet. Everything that follows flows from that split.
Which Plans Trigger This Accounting
The heavy machinery only applies to defined benefit plans. In a defined contribution plan, the employer deposits a set amount into each employee’s account, the journal entry is a debit to pension expense and a credit to cash, and the accounting is done. The employee bears the investment risk, so there is nothing to project.
Defined benefit plans work the opposite way. The employer guarantees a specific monthly benefit at retirement and absorbs all the investment and actuarial risk. Accounting for the plan requires estimating the present value of every future payment owed to current employees, former employees, and retirees, and any shortfall between plan assets and that obligation lands on the balance sheet.
Cash balance plans sit between the two in appearance but not in law. Each participant has a hypothetical account with annual contribution credits and interest credits, which feels like a defined contribution arrangement, but legally these are defined benefit plans.1U.S. Department of Labor. Cash Balance Pension Plans The employer guarantees the interest credit rate and carries the investment risk, so the full ASC 715 framework applies.
The Annual Expense: Net Periodic Pension Cost
The yearly expense a defined benefit sponsor reports is called net periodic pension cost, and it is built from several distinct pieces that behave differently and appear in different places on the income statement.
- Service cost is the present value of benefits employees earn through work during the current year. It is the only component treated as a regular operating expense alongside wages.
- Interest cost captures the fact that the projected benefit obligation grows each year because payment is one year closer. It equals the beginning obligation multiplied by the discount rate.
- Expected return on plan assets offsets the expense using a long-term expected rate rather than actual year-to-year performance, which prevents temporary market moves from whipsawing earnings.
- Amortization of prior service cost spreads the cost of retroactive benefit improvements over the remaining service period of the employees who benefit from the change, rather than hitting the income statement all at once.
- Amortization of net actuarial gains and losses runs the accumulated differences between assumptions and actual experience into expense, but only the portion exceeding 10 percent of the greater of the projected benefit obligation or the market-related value of plan assets. That threshold, called the corridor, keeps small fluctuations out of the income statement.
Settlements and Curtailments
Two special events can force faster recognition. A settlement happens when the employer takes an irrevocable action that eliminates its obligation for part or all of the benefits, such as buying annuity contracts from an insurer for retirees. If total settlement costs in a year exceed the combined service cost and interest cost, the company must immediately recognize a proportional share of the gains or losses sitting in other comprehensive income.2Deloitte Accounting Research Tool. Financial Reporting Considerations Related to Pension and Other Postretirement Benefits
A curtailment is an event that significantly reduces future benefit accruals, whether through a large layoff or a freeze on future service credits. Unrecognized prior service cost tied to service years that will never be worked gets written off, and any change in the projected benefit obligation creates a gain or loss. Net losses are recognized as soon as they become probable and estimable; net gains wait until the event actually occurs.
Where the Numbers Land on the Income Statement
Placement matters as much as size. Under ASU 2017-07, only the service cost component appears in operating income alongside other compensation costs. Interest cost, expected return on plan assets, and both amortization lines must be presented separately, outside operating income.3Financial Accounting Standards Board. ASU 2017-07 Compensation – Retirement Benefits (Topic 715) Settlement and curtailment gains and losses follow the same below-the-line treatment. Operating income reflects only the labor-cost portion of the pension; the financing and remeasurement pieces show up lower.
The balance sheet uses other comprehensive income as a holding tank. When actual investment returns diverge from the expected return, or when actuarial assumptions shift the obligation, those gains and losses do not hit net income immediately. They flow into accumulated other comprehensive income within stockholders’ equity and are gradually reclassified into net periodic pension cost through amortization. Prior service costs from plan amendments travel the same route. The balance sheet reflects the full economic impact right away; the income statement absorbs it over time.
Funded Status on the Balance Sheet
Every defined benefit sponsor must report the plan’s funded status as either an asset or a liability. The math is simple in concept: fair value of plan assets minus the projected benefit obligation. A surplus is a net pension asset; a shortfall is a net pension liability. When a company sponsors multiple plans, overfunded plans aggregate into one asset and underfunded plans aggregate into one liability. There is no netting across the two groups.
Projected Benefit Obligation vs. Accumulated Benefit Obligation
Two measures of the obligation coexist because they answer different questions. The projected benefit obligation factors in expected future salary increases and is the number used for funded status and net periodic pension cost under ASC 715. The accumulated benefit obligation ignores future raises and values benefits based on current pay and service to date. It shows what the plan would owe if every employee stopped working today, and it must appear in the footnotes.
Plan Asset Valuation
Assets on the balance sheet are reported at fair value, meaning the price they would fetch in an orderly sale on the measurement date. For calculating the expected return component, however, sponsors may use a market-related value that smooths unexpected gains and losses over a period of up to five years, which dampens the effect of volatile markets on the annual expense.4Actuarial Standards Board. ASOP No. 44 – Selection and Use of Asset Valuation Methods for Pension Valuations The smoothed value must stay within a reasonable range of actual market value; methods that systematically overstate or understate assets are not acceptable.
The Assumptions Driving Every Number
Every dollar figure traces back to assumptions about an uncertain future, and a fraction of a percentage point can move the reported obligation by millions.
The discount rate is the single most powerful input. It converts future benefit payments into their present value and must be based on yields of high-quality corporate bonds with maturities matching the plan’s expected payout timing.5Mercer. Pension Discount Yield Curve and Index Rates in US A drop in the discount rate inflates the obligation because those future payments are worth more today; a rise shrinks it. Broad interest rate moves can push a plan from overfunded to underfunded in a single year.
The expected return on plan assets sets the offset to pension expense. A higher assumption reduces reported cost, which is why auditors and regulators scrutinize it closely. An overly optimistic rate flatters current earnings and pushes real cost into later periods when actual returns fall short.
Compensation growth assumptions determine how much the projected benefit obligation exceeds the accumulated benefit obligation. Actuaries build the assumption from three layers: general inflation, economy-wide productivity growth, and individual merit increases tied to promotions and seniority.6Actuarial Standards Board. ASOP No. 27 – Selection of Economic Assumptions for Measuring Pension Obligations Inputs include the sponsor’s own pay history, industry compensation surveys, collective bargaining agreements, and any anticipated shifts in pay structure.
Mortality and turnover assumptions round out the picture. Longer life expectancy raises the obligation; higher expected turnover lowers it because some employees leave before vesting. These estimates come from published mortality tables and the plan’s own experience and require periodic updating as longevity trends shift.
Why GAAP and ERISA Numbers Diverge
One of the most misunderstood aspects of the two-track system is that the numbers on the financial statements and the numbers that determine required cash contributions are calculated differently. GAAP reporting follows ASC 715 and is overseen by the FASB. Funding requirements follow ERISA and the Internal Revenue Code and are enforced by the IRS and the Department of Labor. Different discount rates, different asset values, and different cost methods routinely produce different answers for the same plan.
The biggest divergence is the discount rate. GAAP requires a rate reflecting current yields on high-quality fixed-income securities, essentially a market snapshot that resets every measurement date. Funding uses a segment rate structure prescribed by the IRC, based on corporate bond yield curves that can smooth over a 25-year period. The funding rate is more stable, so the funding obligation does not swing as sharply as the GAAP liability when interest rates move.
Asset valuation splits the same way. The balance sheet always uses fair market value. Funding calculations may use an actuarial value that smooths gains and losses over up to five years, subject to a corridor of 80 to 120 percent of fair market value. The funding number can lag real market conditions in both directions.
ERISA Minimum Contributions, Deadlines, and Penalties
Federal law requires defined benefit sponsors to contribute enough each year to move the plan toward full funding. For a single-employer plan, the minimum required contribution equals target normal cost plus any shortfall amortization charge and waiver amortization charge when assets fall below the funding target. When assets meet or exceed the funding target, the minimum drops to target normal cost reduced by the surplus.7Office of the Law Revision Counsel. 26 USC 430 – Minimum Funding Standards for Single-Employer Defined Benefit Pension Plans Shortfall amortization installments generally close funding gaps over seven years, or fifteen years for certain plan years beginning after 2021.
The annual minimum is due eight and a half months after the plan year ends. Plans that had a funding shortfall in the prior year face accelerated quarterly installments on April 15, July 15, October 15, and January 15, each equal to 25 percent of the required annual payment.7Office of the Law Revision Counsel. 26 USC 430 – Minimum Funding Standards for Single-Employer Defined Benefit Pension Plans
Missed deadlines have teeth. The IRS imposes an excise tax of 10 percent of the unpaid minimum required contribution for single-employer plans and 5 percent for multiemployer plans. If the shortfall is not corrected by the end of the taxable period, a second tax equal to 100 percent of the remaining unpaid amount applies.8Office of the Law Revision Counsel. 26 USC 4971 – Taxes on Failure to Meet Minimum Funding Standards When unpaid contributions plus interest exceed $1,000,000, a lien automatically attaches to the property of the employer and its controlled group members.7Office of the Law Revision Counsel. 26 USC 430 – Minimum Funding Standards for Single-Employer Defined Benefit Pension Plans
PBGC Insurance and Premiums
The Pension Benefit Guaranty Corporation insures defined benefit plans so participants receive at least part of their promised benefits if the plan terminates without enough assets. For 2026, the maximum guaranteed monthly benefit for a participant retiring at age 65 under a straight-life annuity is $7,789.77.9Pension Benefit Guaranty Corporation. Maximum Monthly Guarantee Tables Benefits above that cap, or benefits adopted within five years before termination, may not be fully covered.
The coverage is not free. Sponsors pay annual premiums based on participant counts and funding levels. For plan years beginning in 2026, single-employer plans owe a flat-rate premium of $111 per participant plus a variable-rate premium of $52 per $1,000 of unfunded vested benefits, subject to a per-participant cap of $751.10Pension Benefit Guaranty Corporation. Premium Rates Multiemployer plans pay a flat rate of $40 per participant with no variable component. For a large underfunded plan, these premiums can become a meaningful cost of maintaining the arrangement.
Sponsors also have to tell the PBGC about certain events, generally within 30 days, including significant drops in active participation, an inability to pay benefits when due, or controlled-group changes.11eCFR. 29 CFR Part 4043 – Reportable Events and Certain Other Notification Requirements
Tax Deduction Limits for Employer Contributions
Employers get a tax deduction for pension contributions, with limits. For a standalone single-employer defined benefit plan, the deductible amount is generally the greater of the minimum required contribution under IRC 430 or the sum of the funding target, target normal cost, and a cushion equal to 50 percent of the funding target, reduced by plan assets.12Office of the Law Revision Counsel. 26 USC 404 – Deduction for Contributions of an Employer A sponsor can deduct more than the bare minimum and build a buffer, but not without limit.
When an employer sponsors both a defined benefit plan and a defined contribution plan covering some of the same employees, a combined deduction limit applies. The combined cap is the greater of 25 percent of covered compensation or the minimum required contribution for the defined benefit plan. If contributions to the defined contribution plan, excluding elective deferrals, stay at or below 6 percent of aggregate compensation for that plan’s participants, the combined limit does not apply.13Internal Revenue Service. Combined Limits Under IRC Section 404(a)(7)
Reaching in the other direction has its own tax cost. When an employer terminates a qualified plan and reclaims surplus assets, the reversion is hit with a 20 percent excise tax. That rate rises to 50 percent unless the employer establishes a qualified replacement plan or provides pro-rata benefit increases to participants.14Office of the Law Revision Counsel. 26 USC 4980 – Tax on Reversion of Qualified Plan Assets to Employer The steep penalty makes raiding surplus pension assets impractical in almost every scenario.
Required Disclosures
The pension footnote in a company’s annual report is often the longest disclosure in the filing. ASC 715 requires a full reconciliation of the projected benefit obligation from the beginning to the end of the year, showing how service cost, interest cost, actuarial gains and losses, benefit payments, plan amendments, and settlements each moved the number. A parallel reconciliation for plan assets shows contributions, actual returns, and benefit payments.
Plan assets must be broken down by category, including equities, fixed income, real estate, and alternatives, and classified within the fair value hierarchy so readers can see how much of the portfolio is priced using observable market data versus management estimates. Sponsors must disclose expected benefit payments for each of the next five years individually plus the aggregate for the five years after that, giving analysts a concrete picture of near-term cash demands.
Every assumption behind the numbers must be disclosed: discount rate, expected long-term return on plan assets, and rate of compensation increase. Any significant events during the year, including settlements, curtailments, or plan amendments, must be described. The accumulated benefit obligation appears alongside the projected benefit obligation.
Multiemployer Plan Disclosures
Employers participating in multiemployer plans follow a separate track. Because the employer does not control the plan’s investments or assumptions, the financial statements cannot report a funded status the way single-employer plans do. Instead, the employer discloses contributions to each significant multiemployer plan, whether those contributions exceed 5 percent of total plan contributions, and the plan’s most recent certified zone status under the Pension Protection Act.15Financial Accounting Standards Board. FASB Improves Employer Disclosures for Multiemployer Pension Plans The disclosures also flag whether plans are subject to a funding improvement plan and when applicable collective bargaining agreements expire, which signals the risk of withdrawal liability.
Annual Funding Notices to Participants
Beyond the financial statements, ERISA requires plan administrators to send annual funding notices directly to participants, generally within 120 days after the plan year ends. Starting with the 2024 notice year, the notice must report the percentage of plan liabilities funded based on fair market value of assets rather than the older funding target attainment percentage, and it must include a table showing participants in three categories: those receiving benefits, those entitled to future benefits, and active participants.16U.S. Department of Labor. Field Assistance Bulletin No. 2025-02 The notice must also disclose the average return on plan assets and explain the scope of PBGC benefit guarantees.