IAS 19 Service Cost and Net Interest

IAS 19 Service — Core Rule

Under IAS 19, the P&L impact of a defined benefit plan is split into two components recognised in profit or loss — service cost and net interest on the net defined benefit liability (asset) — while remeasurements are recognised exclusively in other comprehensive income (OCI) and never recycled.

How IAS 19 Service Works

IAS 19 Service Cost and Net Interest together form the income statement charge for defined benefit obligations, with the standard deliberately separating these from volatile actuarial movements.

• Current service cost is the increase in the present value of the defined benefit obligation (DBO) resulting from employee service in the current period (IAS 19.8, IAS 19.120). It reflects the actuarially determined cost of benefits earned this year and is always a P&L charge.

• Past service cost arises from plan amendments or curtailments and is recognised immediately in P&L in the period the amendment occurs, regardless of whether benefits are vested (IAS 19.103–104). This was a significant change from the pre-2011 standard, which permitted deferral of unvested past service cost.

• Net interest on the net defined benefit liability (asset) is calculated by multiplying the net defined benefit liability (or asset) at the start of the period by the discount rate used to measure the DBO (IAS 19.123). Critically, this single net figure replaces the old "expected return on plan assets" approach — the notional return on assets is now capped at the discount rate, eliminating management's ability to boost P&L through optimistic return assumptions.

• The discount rate must reference high-quality corporate bond yields (or government bonds in markets where no deep corporate bond market exists) of currency and duration matching the obligation (IAS 19.83). Changes in the discount rate itself flow through OCI as remeasurements, not P&L.

• Remeasurements — comprising actuarial gains/losses on the DBO, the difference between actual and interest return on plan assets, and changes in the asset ceiling — are recognised in OCI under IAS 19.127 and are explicitly prohibited from being recycled to P&L (IAS 19.122). They accumulate in equity but do not pass through the income statement in any subsequent period.

• Presentation: IAS 19 does not mandate a single line item but requires that service cost and net interest not be netted against each other in the face of the financial statements; many entities present service cost within operating expenses and net interest within finance costs (IAS 19.134).

IAS 19 Service — Practical Example

Scenario: At 1 January 20X1, a company has a DBO of €10,000,000 and plan assets at fair value of €8,000,000. Net defined benefit liability = €2,000,000. The discount rate is 4.5%. Current service cost for 20X1 is €480,000. No plan amendments occur.

Net interest calculation:

Net defined benefit liability × discount rate = €2,000,000 × 4.5% = €90,000

Journal entries for 20X1 P&L components:

If actual return on plan assets exceeds the interest component (i.e., exceeds €360,000 = €8,000,000 × 4.5%), the excess is a remeasurement gain in OCI:

IAS 19 Service — Common Pitfalls

• Confusing net interest with expected return on assets: Practitioners trained under pre-2011 IAS 19 sometimes still gross up the interest cost on the DBO and a separate expected return on assets. Post-2011, only one net interest figure — based on the discount rate — enters P&L. Using a higher expected return rate inflates profit and is non-compliant (IAS 19.123).

• Recognising past service cost over a vesting period: Under the revised standard, all past service cost is expensed immediately in P&L on the date of the plan amendment (IAS 19.103). Deferring it — even for unvested benefits — is a common error during audits of plan amendments or curtailments.

• Recycling OCI remeasurements: Actuarial gains/losses recognised in OCI are permanently stranded in equity. Any reclassification to P&L in a later period — for example, when employees leave or the plan is wound up — is a direct violation of IAS 19.122 and a frequent audit finding.

IAS 19 Service — Key Paragraphs

• IAS 19.8 — Definitions of current service cost, past service cost, net interest on net defined benefit liability.
• IAS 19.83 — Discount rate methodology (high-quality corporate bonds; duration matching).
• IAS 19.103–104 — Immediate P&L recognition of past service cost and gains/losses on curtailment.
• IAS 19.120–123 — Components of defined benefit cost: service cost, net interest, and remeasurements.
• IAS 19.127 — Remeasurements recognised in OCI; prohibition on subsequent recycling.
• IAS 19.134 — Disclosure and presentation requirements for defined benefit cost components.