What is the difference between the interest rate and the A.P.R.?

You'll see an interest rate and an Annual Percentage Rate (A.P.R.) for each mortgage loan you see advertised. The easy answer to "why" is that federal law requires the lender to tell you both.

The A.P.R. is a tool for comparing different loans, which will include different interest rates but also different points and other terms. The A.P.R. is designed to represent the "true cost of a loan" to the borrower, expressed in the form of a yearly rate. This way, lenders can't "hide" fees and upfront costs behind low advertised rates.

While it's designed to make it easier to compare loans, it's sometimes confusing because the A.P.R. includes some, but not all, of the various fees and insurance premiums that accompany a mortgage. And since the federal law does not clearly define what goes into the calculation, A.P.R.s can vary from lender to lender and loan to loan.

The A.P.R. on an adjustable rate loan is only effective for shopping purposes. One of the main components in the A.P.R. calculation is the note rate which would adjust after any fixed period expires.  

The lesson is, that A.P.R. can be a guide, but you need a mortgage professional to help you find the truly best loan for you.

Note when you're browsing for loan terms that the A.P.R. will not tell you about balloon payments or prepayment penalties, or how long your rate is locked. Also, you'll see that A.P.R.s on 15-year loans will carry a higher relative rate due to the fact that points are amortized over a shorter period of time.