(1) In this section -
'adjusted income' for a tax year means a person's income from all sources for the tax year after taking into account any allowance, charge, deduction or loss attributable to a specific source to which the person is entitled in taxing the income from the source or which is required to be made in taxing the person's income from the source, but without taking into account any allowance, charge, deduction or loss to which the person is entitled, or which is required to be made, in taxing the person's income from all sources;
'adjusted profits or gains' in relation to a trade for a tax year means the amount, if any, of the profits or gains from the trade after taking into account any allowance, charge, deduction or loss to which a person is entitled in taxing the trade or which is required to be made in taxing the trade, and references to the adjusted profits or gains from the combined trade or from the non-specified trade shall be construed accordingly;
'combined trad
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