Executive Rule No. 31 establishes the tax treatment for profits and losses resulting from the disposal of fixed assets. This rule mandates that such financial outcomes, arising from sale, donation, transfer, or barter, are accepted based on supporting documentation like contracts and invoices. In the absence of sufficient documentation, a capital gain will be estimated, irrespective of the asset's depreciation status. It is a strict requirement to notify the Tax Department before any disposal, which must occur in the presence of their representative.