Section 43B of the Income-tax Act, 1961 mandates that certain specified expenses can only be claimed as deductions in the year they are actually paid, regardless of the method of accounting employed by the taxpayer. This section applies to expenses such as tax, duty, cess, or fee, contributions to provident fund or superannuation fund, bonus or commission to employees, and interest on loans from public financial institutions, among others. The significance of this section lies in its aim to curb tax evasion by ensuring that deductions are not claimed on accrued expenses that remain unpaid. The statutory test under this section requires the taxpayer to substantiate the actual payment of these expenses within the relevant financial year or before the due date of filing the return of income. The burden of proof rests on the taxpayer to demonstrate compliance with this requirement. In practice, this section is crucial for maintaining the integrity of the tax system by aligning deductions with cash flow realities.