What are the key differences between IFRS and US GAAP pension accounting?
I'm studying pensions for CFA Level II and the IFRS/GAAP differences are confusing. IAS 19R seems simpler in some ways but more restrictive in others. What are the critical differences an analyst needs to know?
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 |
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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