Aggregation of income from ordinary sources defines current income, nets prior unabsorbed losses, and converts deficits into unabsorbed current losses.

Income other than capital gains is computed by aggregating amounts from each source within a head; those head amounts are combined across heads to form the current income from ordinary sources. That current income is netted with any unabsorbed preceding year loss from the ordinary sources to yield the gross total income from ordinary sources, which is treated as nil if negative and the absolute deficit becomes the unabsorbed current loss from ordinary sources.

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