For the September quarter, Nifty 50 banks are forecasted to see an 11.5% rise in net interest income, yet net profits are expected to grow more slowly at around 10%. This growth is supported by robust capital inflows from the RBI's FCNR-B deposit swap scheme, bolstering deposit growth. Leading banks like Axis Bank and Kotak Mahindra Bank are likely to show substantial profit growth this quarter.