Finance Act, 1915

Provision as to estimation of total income.

18. Where an assessment to income tax has become final and conclusive for the purposes of the income tax for any year, the assessment shall also be final and conclusive in estimating total income from all sources for the purposes of super-tax for the following year, or of any exemption, relief, or abatement under the Income Tax Acts, and no allowance or adjustment of liability on the ground of diminution of income or loss shall be taken into account in estimating the total income from all sources for such purposes unless that allowance or adjustment has been previously made in respect of income tax on an application under the special provisions of the Income Tax Acts relating thereto.