Tax deduction at source on interest on securities: specified rates apply and certified exemptions prevent deduction, follow procedures. Deduct income-tax and surcharge at source from interest on Government securities in 1971-72 at specified differentiated rates by payee status and security type; accept and apply exemption or abatement certificates under section 197, and obey statutory exemptions (including specified Defence Loans, Gold Bonds and National Savings Certificates and exempt corporations) and resident-individual declaration conditions to avoid deduction. Round tax to the nearest rupee per the rounding rule and consult Income-tax Officers in case of doubt. Continue prior-year rates until the Finance Bill is enacted.