Presumptive taxation for non-resident aircraft operators applies a deemed profit rate and bars ordinary deductions. Special presumptive-computation rule applies to non-residents carrying on the business of operating aircraft. Business profits from such operations are deemed to be chargeable under the head Profits and gains of business or profession at 5% of the aggregate of amounts received or receivable for carriage of passengers, livestock, mail or goods from places in India, and amounts received or deemed to be received in India for similar carriage from places outside India. The provision overrides contrary provisions and disallows deductions, losses or allowances against the computed income.