151.This section explains circumstances in which a repayment would constitute unjustified enrichment where the payment of tax was made by someone other than the taxpayer. Loss or damage related to mistaken assumptions about tax made by a taxpayer should be excluded from consideration of whether a taxpayer would be unjustly enriched. The taxpayer may show that a certain amount would be appropriate compensation for the loss or damage resulting from the mistaken assumption and this may be taken into account.