you can.. any excess payment consider as advance payment.. whether reduce your principal and debit credit your balance depending on your loan type.. fixed rate/semi flexi or full flexi loan.. mostly should be semi-flexi loan which will consider as advance payment.. some bank have a cap like 50%/70%.. i knew MBB didnt have this cap, so if you have 200k on hand and dont know what to do, put into the semi flexi loan treat it as advance payment, then when you pay monthly installment 2k, maybe 1500 reduce principal and 500 for interests rather than 500 principal, 1500 interests if without 200k advance..