Deductions from salaries: defined categories, formulaic computation and aggregation limits govern tax relief eligibility.
Section 19 itemises fourteen categories of salary related receipts that are deductible or exempt and prescribes formulas, ceilings and conditions for each. Relief for gratuity, leave encashment, pension commutation, retrenchment and voluntary retirement is computed by statutory formulas or by reference to notified limits and other enactments; an aggregation rule limits cumulative exemption where multiple receipts occur. The provision depends on cross references to other statutes and notifications, requiring classification, documentary evidence and tracing of prior exemptions to determine allowable deductions.