Insurance business income is computed under special rules for life, other insurance, and non-resident premium apportionment. Profits and gains of any insurance business, including business of a mutual insurance company or co-operative society, are computed under Schedule XIV notwithstanding the general computation provisions. Life insurance business is computed separately on the basis of actuarial surplus or deficit with specified adjustments, while other insurance business is computed from profit before tax and appropriations with prescribed add-backs and deductions. For non-resident insurers, taxable income may be apportioned by the ratio of Indian premium income to total premium income.