If you are in the market for a home mortgage refinance loan, there are several things you need to know to avoid overpaying. Careful comparison shopping will help you avoid 90% of the mistakes homeowners make when refinancing their mortgage loans. Here are several tips to help get you started with a home mortgage refinance loan.Before choosing a home mortgage refinance loan it is important to do your homework and research mortgage lenders. When you comparison shop home mortgage refinance loan offers, make sure you are comparing more than interest rates. Some homeowners think that by choosing the home mortgage refinance loan with the lowest interest rate they will automatically get the best deal. If you focus only on the interest rates you will overpay for closing costs and lender fees.Home Mortgage Refinance Loan: Watch Out for Yield Spread PremiumA hidden fee you need to watch out for is called Yield Spread Premium. This is the retail markup of your mortgage interest rate by the Mortgage Company or broker. When you apply for a home mortgage refinance loan, the wholesale lender that approves your application qualifies you for a certain interest rate. This wholesale lender gives your Mortgage Company or broker a written guarantee of that interest rate. The written guarantee you receive is rarely the same one from the wholesale lender and includes Yield Spread Premium.Mortgage Companies and Brokers mark up the interest rate on your home mortgage refinance loan because the wholesale lender pays them a bonus for overcharging you. How can you avoid paying Yield Spread Premium on your home mortgage refinance loan? Homeowners that recognize this markup will avoid paying it. You can learn more about avoiding retail markup of your home mortgage refinance loan and other costly mistakes by registering for a free mortgage refinancing tutorial.