What are the key differences between IFRS and US GAAP pension accounting?

Question

AcadiFi · Accepted Answer

The pension accounting differences between IFRS (IAS 19R) and US GAAP (ASC 715) are a frequent exam topic. Here is a concise comparison.

**Side-by-Side Comparison:**

| Feature | IFRS (IAS 19R) | US GAAP (ASC 715) |
|---|---|---|
| **Net interest calculation** | Single discount rate x net pension liability/asset | Separate: Interest on PBO + Expected return on assets |
| **Expected return on assets** | Not used (uses discount rate on net amount) | Used separately in pension expense |
| **Remeasurements (actuarial G/L)** | Always in OCI, never recycled to P&L | In OCI, amortized to P&L via corridor approach |
| **Past service cost** | Immediate expense in P&L | Amortized from OCI to P&L over service years |
| **Presentation** | Service cost in operations; net interest where entity chooses | Service cost in operations; other components typically below operating |
| **Asset ceiling** | Limited to PV of future economic benefits | No explicit asset ceiling |

```mermaid
flowchart LR
    subgraph IFRS["IFRS (IAS 19R)"]
        I1["Service Cost → P&L"]
        I2["Net Interest → P&L"]
        I3["Remeasurements → OCI (Never Recycled)"]
    end
    subgraph GAAP["US GAAP (ASC 715)"]
        G1["Service Cost → Operating Income"]
        G2["Interest Cost → Non-Operating"]
        G3["Expected Return → Non-Operating (Credit)"]
        G4["Amortization of Actuarial G/L → P&L (Corridor)"]
    end
```

**Key Analytical Implication -- The Expected Return Issue:**

Under US GAAP, companies choose an "expected return on plan assets." A higher expected return assumption **reduces pension expense**, inflating operating income. This is a subjective assumption that management can use to manage earnings.

Under IFRS, there is no expected return assumption -- the discount rate is applied to the net pension position. This removes management discretion.

**Corridor Method (US GAAP only):**
The unrecognized actuarial gain/loss is amortized only when it exceeds the greater of:
- 10% of PBO, or
- 10% of plan asset fair value

The excess is amortized over the average remaining service life of employees.

**Example:** If cumulative unrecognized losses are $120M, PBO is $800M (10% = $80M), and plan assets are $700M (10% = $70M), the corridor is $80M. The excess = $120M - $80M = $40M, amortized over, say, 15 years = $2.67M per year added to pension expense.

**Exam Tip:** Know that IFRS pension expense is generally more volatile in OCI but smoother in P&L (no recycling), while US GAAP may show smoother OCI but introduces the corridor amortization to P&L.

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What are the key differences between IFRS and US GAAP pension accounting?

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Practice Questions

Feature	IFRS (IAS 19R)	US GAAP (ASC 715)
Net interest calculation	Single discount rate x net pension liability/asset	Separate: Interest on PBO + Expected return on assets
Expected return on assets	Not used (uses discount rate on net amount)	Used separately in pension expense
Remeasurements (actuarial G/L)	Always in OCI, never recycled to P&L	In OCI, amortized to P&L via corridor approach
Past service cost	Immediate expense in P&L	Amortized from OCI to P&L over service years
Presentation	Service cost in operations; net interest where entity chooses	Service cost in operations; other components typically below operating
Asset ceiling	Limited to PV of future economic benefits	No explicit asset ceiling