Amortisation of film production costs: provisional year wise deductions permitted pending final exploitation period adjustment. Amortisation of film production costs and distribution rights is allowed provisionally in the first instance based on actual or estimated receipts, with final adjustment after the exploitation period. High cost films follow a fixed three year amortisation schedule (sixty per cent, twenty five per cent, fifteen per cent). Lower cost films normally have an effective life of one year and may be fully allowed in the year of release or split half in the year of release and half in the following year if released late in the accounting year. Distributors follow the same treatment.