A very important reason you need to have at least some idea of your down payment is for shopping interest rates. Some loan programs charge a slightly higher interest rate for minimal down payments. Plus, the interest rates for different loan programs are not the same. For example, conventional, VA, and FHA all offer fixed rate loans. However, the rates vary from one program to another.
If you shop lenders by phone, the loan officer will be able to tell which programs fit and quote you rates accordingly. However, if you are shopping on the internet, you have to have some idea of your loan program on your own.
