For the purpose of computing the "indebtedness" of any person, there shall be excluded any particular indebtedness if, upon or prior to the maturity thereof, there shall have been irrevocably deposited with the proper depository in trust the necessary funds (or evidences of such indebtedness, or other securities, if permitted by the instrument creating such indebtedness) for the payment, redemption or satisfaction of such indebtedness; and thereafter such funds, evidences of indebtedness and securities so deposited shall not be included in any computation of the assets of such person.
N.Y. Comp. Codes R. & Regs. Tit. 11 §§ 18-3.1