Coughing up that 20 per cent of the total amount as downpayment for buying a house of your dream is always a challenging task. Banks as per the Reserve Bank of India (RBI) are required to fund at least 10 to 20 per cent of the entire loan amount as the downpayment when taking a home loan. That means this is the amount you would be paying upfront to the property owner when buying a house. In that case one should be able to plan their house purchase a few years in advance so that one is able to save a decent amount before setting out for the big purchase.