Defined Contribution Pension Plan

A defined contribution pension plan is a retirement plan that specifies how much the employer, and often the employee as well, will contribute toward retirement, rather than promising any specific future benefit amount. The most familiar example in the United States is the 401(k) plan, where contributions are invested on the employee's behalf, and the eventual retirement income depends entirely on how well those invested contributions perform over the employee's working years.

An employer might agree to contribute a flat percentage of each employee's salary, or to match a portion of what the employee contributes, up to some limit, into the employee's own individual retirement account. Once that contribution is made, the employer's obligation is fully satisfied for that period; the employer bears no further responsibility for how the invested funds perform, which shifts the investment risk, and the responsibility for choosing investments, entirely onto the employee.

Because the employer's obligation under a defined contribution plan is fixed and fully discharged once the agreed contribution is made, accounting for this type of plan is comparatively simple: the employer records pension expense equal to the contribution it owes for the period, with no need for the complex actuarial estimates of future benefits, investment returns, or employee longevity that a defined benefit pension plan requires. This simplicity, combined with the absence of any long-term funding risk to the employer, is a major reason defined contribution plans have become the dominant form of employer-sponsored retirement plan.

Unlike a defined benefit plan, where a formula guarantees a predictable retirement income regardless of investment performance, a defined contribution plan offers no such guarantee: an employee's eventual retirement balance depends entirely on contribution amounts, investment choices, and market performance over their working career, meaning two employees who contributed identical amounts could retire with very different account balances depending on how their chosen investments actually performed. This shift of investment risk onto employees is the central trade-off that distinguishes defined contribution plans from the older defined benefit model they have largely replaced.

Defined contribution plans typically allow employees to take their vested account balance with them if they change employers, often with considerably simpler portability rules than many defined benefit plans historically offered, since the account is individually owned rather than tied to a promised future payment stream from a specific employer. Employer matching contributions are commonly subject to a vesting schedule, meaning an employee who leaves before fully vesting forfeits some or all of the employer's matching contributions, even though the employee's own contributions always belong to the employee immediately and in full.

An employee earning $80,000 who contributes 6% of salary, $4,800, to a 401(k) plan with a full employer match up to that same 6% receives an additional $4,800 from the employer, for $9,600 of total annual contributions. The employer’s accounting is simple: it records $4,800 of pension expense for its own matching contribution, and its obligation ends there, with the eventual account balance at retirement depending entirely on how that money is invested and performs over the following years.