Pension Plan Inputs

$
Current-year benefit earned by employees
$
Projected benefit obligation at start of year
%
Enter as percentage (e.g., 5 for 5%)
$
Fair value of plan assets at start of year
%
Long-term expected return (smoothed, not actual)
$
Actual return earned (can be negative)
$
Positive = cost, negative = credit (reduces expense)
$
Positive = net loss, negative = net gain
years
Average remaining years of employee service
$
Employer contributions during the year
$
Benefits paid to retirees during the year
Pension Expense Formula (ASC 715)
Pension Expense = SC + IC − ER + PSC + NLA
SC = Service Cost | IC = Interest Cost | ER = Expected Return | PSC = Prior Service Cost Amort | NLA = Net Loss Amort
Ryan O'Connell, CFA
Calculator by Ryan O'Connell, CFA

Total Pension Expense

Total Pension Expense (ASC 715) $556,667

5-Component Breakdown

Service Cost + $500,000
Interest Cost + $500,000
Expected Return on Plan Assets − $560,000
Prior Service Cost Amortization + $50,000
Net Loss Amortization + $66,667
Total Pension Expense $556,667

Corridor Amortization Details

Interest Cost $500,000
Expected Return $560,000
Corridor (10%) $1,000,000
Excess Over Corridor $1,000,000
Net Loss Amortization $66,667

PBO & Plan Assets Rollforward

Ending PBO $10,600,000
Ending Plan Assets $8,900,000

Funded Status

Funded Status −$1,700,000
Funded Ratio ? 84.0% Moderately Funded

Model Assumptions

  • Single discount rate applied for the entire period
  • Pension expense uses expected return (long-term smoothed rate), not actual return
  • Fair value used as market-related value of plan assets
  • Corridor uses beginning-of-year PBO and plan asset balances
  • Active employees only; frozen-plan life-expectancy denominator not modeled
  • No plan amendments during the year
  • No settlements or curtailments
  • Employer contributions and benefits paid assumed at year-end
  • ASC 715 (U.S. GAAP) framework

For educational purposes. Not financial advice. Market conventions simplified.

Understanding Pension Expense (ASC 715)

What is Pension Expense?

Pension expense (also called net periodic pension cost) is the amount a company recognizes in its income statement for its defined benefit pension plan obligations. Under ASC 715, pension expense consists of five components that together capture the economic cost of providing pension benefits to employees.

Pension Expense Formula (ASC 715)
Pension Expense = Service Cost + Interest Cost − Expected Return + PSC Amortization + Net Loss Amortization
Where Expected Return reduces expense and Net Gain Amortization (if applicable) also reduces expense

The 5 Components of Pension Expense

1. Service Cost

Present value of benefits earned by employees during the current year. Computed by an actuary using the plan's benefit formula and projected salary levels. This is the only component reported in operating income (per ASU 2017-07).

2. Interest Cost

Interest accrued on the beginning PBO at the discount (settlement) rate. Reflects the time value of money on the pension obligation. Calculated as Beginning PBO × Discount Rate.

3. Expected Return on Plan Assets

Reduces pension expense. Uses the long-term expected rate of return (not actual return) to prevent market volatility from creating large swings in reported pension cost. The difference between actual and expected return flows through OCI.

4. Prior Service Cost/Credit Amortization

When a plan is initiated or amended, retroactive benefits create prior service cost (or credit). This is recorded in OCI and amortized over the remaining service lives of affected employees, systematically flowing into pension expense.

5. Net Gain/Loss Amortization (Corridor Approach): Cumulative gains and losses from asset returns and actuarial changes are accumulated in AOCI. Amortization is triggered only when the balance exceeds the corridor (10% of the greater of beginning PBO or plan assets). The minimum amortization equals the excess divided by average remaining service life.

Funded Status on the Balance Sheet

Under ASC 715, a company must recognize the funded status of its pension plan directly on the balance sheet:

  • Underfunded (Plan Assets < PBO): Report a net pension liability
  • Overfunded (Plan Assets > PBO): Report a net pension asset

The funded ratio (Plan Assets / PBO) provides a quick measure of plan health, though color thresholds shown in this calculator are heuristic indicators, not GAAP-defined benchmarks.

Frequently Asked Questions

A defined benefit plan promises employees a specific retirement benefit based on salary and years of service — the employer bears all investment risk. A defined contribution plan (like a 401(k)) specifies only the employer's contribution amount — the employee bears all investment risk. Pension expense calculations under ASC 715 apply only to defined benefit plans.

The 5 components are: (1) Service cost — the present value of benefits earned this year; (2) Interest cost — interest accrued on the beginning PBO; (3) Expected return on plan assets — reduces expense using a long-term smoothed rate; (4) Amortization of prior service cost or credit — systematic recognition of retroactive benefit changes; (5) Amortization of net gain or loss — triggered only when cumulative gains/losses exceed the corridor threshold.

The corridor approach prevents excessive volatility in pension expense. The corridor equals 10% of the greater of beginning PBO or beginning plan assets (fair value used as market-related value). Only when cumulative unrecognized net gains or losses in AOCI exceed this corridor is amortization required. The minimum amortization equals the excess divided by the average remaining service life of active employees.

ASC 715 uses the expected long-term rate of return rather than actual returns to calculate pension expense. This smoothing mechanism prevents year-to-year market volatility from causing large swings in reported pension cost. The difference between actual and expected return (the unexpected gain or loss) is recorded in Other Comprehensive Income (OCI) and only affects expense through the corridor amortization mechanism.

Funded status equals plan assets minus the projected benefit obligation (PBO). A negative funded status means the plan is underfunded — the company reports a net pension liability on its balance sheet. A positive funded status means the plan is overfunded — reported as a net pension asset. Under ASC 715, the funded status must be recognized on the balance sheet.

The PBO is the actuarial present value of all pension benefits earned to date, based on projected future salary levels. It increases each year by service cost (new benefits earned) and interest cost (time value of money on existing obligation), and decreases when benefits are paid to retirees. Actuarial gains and losses from changes in assumptions also affect the PBO, though this calculator simplifies by not including mid-year actuarial adjustments.
Disclaimer

This calculator is for educational purposes only and uses a simplified model of pension expense under ASC 715. Actual pension accounting involves actuarial valuations, plan-specific assumptions, and additional components such as settlements, curtailments, and transition obligations. Consult a qualified actuary or CPA for actual pension accounting needs.

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