Annuity deposit requirement mandates deposits at prescribed rates for persons under the relevant chapter, per statutory definitions. Every person to whom the relevant chapter of the Income-tax Act applies must make an annuity deposit for the assessment year beginning 1 April 1967 and for deposits during the corresponding financial year at the rates specified in the Second Schedule; the terms 'adjusted total income', 'annuity deposit' and 'depositor' are defined by reference to the statutory definitions in section 280B.