Gruh Finance Ltd (GFL), a subsidiary of HDFC Ltd has posted a profit after tax of Rs 49.91 crore for the quarter ended December 31,compared to Rs 36.16 crore for the same period last fiscal, an increase of 38 per cent.The company's net interest margin (NIM) year-to-date upto December 2010 is Rs 103.11 crore, up 25 per cent from last fiscal. GFL's deposits portfolio stands at Rs 286.48 crores, as on December 31, 2010. GFL has a network of 111 retail offices across seven states.