Health insurance deduction expanded to include preventive check ups and lump sum spreading, with enhanced limits for senior citizens. Section 126 allows deductions for health insurance premiums and medical expenditures for individuals and HUFs, with separate caps for premiums, preventive health check ups, and medical expenses, aggregate limits linking insurance and medical expenditure for self/family and for parents, enhanced insurance limits for senior citizens, a rule permitting deduction for medical expenditure on a senior citizen only where no premium is paid for that person, spread of lump sum premiums over relevant tax years by an appropriate fraction, payment mode requirements for preventive check ups and other payments, and insurer approval conditions.