Defined Benefit Pension Plan

A defined benefit pension plan is a retirement plan that specifies, through a formula, the exact benefit a retiree will receive, typically expressed as a percentage of the employee's final or average salary multiplied by the employee's years of service. The employer's obligation under this kind of plan is to contribute whatever amount is actuarially necessary, over time, to ensure the plan has enough assets to pay the promised benefits when employees actually retire, which means the employer, not the employee, bears the investment and funding risk.

A typical formula might promise 1.5% of an employee's final average salary for each year of service, so an employee retiring after 30 years with a $80,000 final average salary would receive an annual pension of $36,000, calculated as 1.5% times 30 years times $80,000. Because the formula is fixed in advance, the employee knows reasonably precisely what retirement income to expect, regardless of how the plan's underlying investments actually perform.

Because the employer bears the risk of funding a promised future benefit, accounting for a defined benefit plan requires estimating numerous uncertain future variables, including how long employees will live in retirement, expected future salary growth, and the expected long-term return on the plan's invested assets, all of which require actuarial assumptions reassessed periodically. The resulting pension obligation and plan asset values are reported on the employer's financial statements, and a shortfall between the two, called an underfunded status, represents a real financial obligation the company will eventually need to address through additional contributions.

A defined contribution pension plan shifts the investment and funding risk entirely onto the employee, specifying only how much the employer will contribute rather than what benefit the employee will ultimately receive, with the eventual retirement income depending entirely on how well the invested contributions perform over time. Defined benefit plans have become considerably less common among private employers over recent decades, largely because of the funding risk and accounting complexity they create for the employer, though they remain widespread in government and certain unionized sectors.

A company with a significantly underfunded defined benefit pension plan carries a real economic obligation that may not be fully apparent from a quick glance at its balance sheet, since the required disclosures, while extensive, are often found deep in the notes to the financial statements rather than on its face. Analysts evaluating companies with large legacy defined benefit obligations, common in older industrial and unionized companies, pay close attention to funding status trends and the underlying actuarial assumptions used, since optimistic assumptions about investment returns or employee longevity can mask a genuinely larger funding gap than the headline numbers initially suggest.

An employee earning a final average salary of $90,000 after 25 years of service under a plan promising 1.75% per year of service would receive an annual pension of $39,375, calculated as 1.75% times 25 times $90,000. The employer bears full responsibility for ensuring the pension fund holds enough invested assets to pay that amount, and every other retiree’s promised benefit, for as long as each retiree lives, regardless of how the fund’s investments actually perform along the way.