The real APR (Annual Percentage Rate) of your mortgage is not exactly as much as it says in the contract. The extra fees and payments involved always result in a slightly higher actual rate.
I don't want to upset you, but the advertised APR and the APR you really pay on your loan aren't necessarily the same amount. By the time you add up all the other components involved, such as the closing costs etc., your APR will not be exactly what you thought it would be.
If you purchase a home valued at $300,000.00 and take out a 30 year loan with a 5.000% interest rate, you will actually be paying 5.128% if you make a $30,000.00 down payment. This figure includes the closing costs and the points, assuming you've purchased one point with the loan.