Corridor Approcah

Under GAAP, does the corridor approach only apply to actuairal G/L or does it also apply to past service cost

Only to actuarial gains / losses.

Past service cost is amortized over the average service life of affected employees.

good luck me if they ask for details on the corridor approach in the exam. so far I haven’t faced a single question in the EOC questions, or CFAI practice questions/mocks on the corridor approach.