Section 33(5)(b) in Tamil Nadu Court-Fees and Suits Valuation Act, 1955
(b)In a suit by a sub-mortgagee, if the prayer is for the sale of the property mortgaged to the original mortgagee and the original mortgagor is also impleaded as a defendant, fee shall be computed on the entire amount claimed on the original mortgage which is sub-mortgaged to him.