For US GAAP interest cost (which we see in the reconciliation of PBO) is the same as the interest cost we see in I/S. Both use opening PBO x r.
However for IFRS these two are NOT the same. The reconciliation of DBO uses the same approach as US GAAP but the I/S value is not the same. Instead for the I/S we have opening funded status x r.
Very important distinction.
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