Relief under Section 89(1): compare tax on receipt and accrual bases to determine relief for salary arrears and adjust current tax payable.
Relief for salary received in arrears or advance is determined by computing tax on the aggregate income on the receipt basis and comparing it with tax computed as if the income had been charged to the earlier year(s); the relief equals the difference. The example aggregates salary and arrears, applies standard and specified deductions, computes net income and tax for the years on receipt and accrual bases, and derives the relief amount which is then deducted from current year tax payable.