What is the difference between expected return and actual return on pension plan assets?

This is one of the most important IFRS vs. US GAAP differences in pension accounting, and it directly affects how pension cost appears on the income statement.

IFRS Approach (IAS 19 Revised):

IFRS does not use an expected return on assets in the income statement. Instead, it calculates net interest on the net defined benefit liability (or asset):

Net Interest = Discount Rate x Net Pension Liability (or Asset)

Where Net Pension Liability = PBO - Fair Value of Plan Assets

The discount rate is the high-quality corporate bond rate used to discount the pension obligation. Any difference between the actual return on assets and the interest calculated using the discount rate is a remeasurement recognized in OCI (never recycled to P&L).

US GAAP Approach (ASC 715):

US GAAP allows companies to use an expected long-term rate of return on plan assets, which is a management estimate (often 6-8%). This expected return reduces pension cost on the income statement.

The difference between actual return and expected return is deferred in OCI and amortized to P&L using the corridor approach if cumulative unrecognized gains/losses exceed 10% of the greater of PBO or plan assets.

Worked Example:

Dalton Corp has a pension plan with:

• PBO: $50,000,000
• Plan assets (fair value): $42,000,000
• Discount rate: 4.5%
• Expected return on assets (GAAP): 7.0%
• Actual return on assets: $3,360,000 (8.0%)

IFRS calculation:

• Net pension liability = $50M - $42M = $8,000,000
• Net interest cost = $8,000,000 x 4.5% = $360,000 (in P&L as part of pension cost)
• Interest on plan assets (implicit) = $42M x 4.5% = $1,890,000
• Actual return = $3,360,000
• Remeasurement gain = $3,360,000 - $1,890,000 = $1,470,000 (in OCI, never recycled)

US GAAP calculation:

• Expected return = $42,000,000 x 7.0% = $2,940,000 (reduces pension cost in P&L)
• Actual return = $3,360,000
• Deferred gain = $3,360,000 - $2,940,000 = $420,000 (deferred in OCI)

Key analytical implication:

US GAAP's expected return is a management assumption that can be manipulated. A higher expected return assumption reduces pension expense and inflates earnings. Analysts should compare the expected return to actual historical returns and peer assumptions.

Exam tip: The CFA Level II exam frequently tests whether you can calculate pension cost under both standards and identify how the different return assumptions affect income. Remember: IFRS uses one discount rate for everything; GAAP uses the expected return for assets and the discount rate for the obligation.

For more pension practice problems, check our CFA Level II question bank on AcadiFi.