Notwithstanding anything contained in any law or contract to the contrary, the Commissioner may, at any time or from time to time, by notice in writing, a copy of which shall be forwarded to the dealer or person at his last address known to the Commissioner, require-

(a) any person from whom any amount of money is due, or may become due or to a dealer or person on whom a notice has been served under sub-section (6) of section 29, or, who has admitted to any liability by filing a return or revised return but has not discharged such liability; or

(b) any person who holds or may subsequently hold money for or on account of such dealer or person,

to pay to the Commissioner, either forthwith upon the money becoming due or being held or at or within the time specified in the notice (but not before the money becomes due or is held as aforesaid), so much of the money as is sufficient to pay the amount due by the dealer in respect of the arrears of tax, penalty, interest and sum forfeited under this Act, or the whole of the money when it is equal to or less than that amount.

Explanation - For the purposes of this section, the amount of money due to a dealer from, or money held for or on account of a dealer, by any person, shall be calculated after deducting therefrom such claims (if any) lawfully subsisting, as may have fallen due for payment by such dealer to such person.