The grossing up ensures that Parliament's Appropriation Accounts and audit reports show the full extent of losses by embezzlement, theft, or misappropriation. If losses were simply netted off against receipts, the true magnitude of loss — and hence of financial misconduct — would be invisible. By showing both the deemed receipt and the loss separately, the accounts provide a complete and transparent record that can be scrutinised by the CAG and the Public Accounts Committee.
Source: GAR Rule 57