There is no law that sets the down payment. That is set by the lending institution you get your loan from. A good lender wil help you evaluate your financial situation, tell you how much you qualify for and any programs for which you may qualify. A down payment of 20% is usually for conventional loans. There are programs available through FHA, VA, USDA that require less down payment.
When you begin the qualifying process talk to several mortgage lenders to see which one is most helpful, has the best interest rates and is willing to work with you to get you through all the hurdles of financing.
A good real estate agent will also be able to offer guidance.
If I can be of any assistance please feel free to contact me at 229-292-2021 - Mon Oct 5 2009, 06:52