Section 21
SEC. 21. Any Register of Deeds shall accept from any rural bank and its borrowers and mortgagors for registration, free from all charges, fees and documentary stamp tax, collectible under existing laws, any instruments, whether voluntary or involuntary, relating to loans or transaction extended by a rural bank in an amount not exceeding Fifty thousand pesos (P50,000): Provided, however, That charges, if any shall be collectible on the amount in excess of Fifty thousand pesos (P50,000); and an instruments related to assignments of several mortgages consolidated in a single deed, if any, shall be devied only on the amount in excess of Fifty thousand pesos (P50,000) of the consideration in the assignment of each mortgage, or such amount as the Secretary of Finance, upon recommendation of the Monetary Board, may prescribe as may be necessary to promote and expand the rural economy.