Both the interest rate and the APR describe loan costs. The interest rate will tell you what you pay each month. The APR tells you the total cost over the life of the loan. Use the APR to compare total loan costs. It’s especially helpful when comparing a loan that only charges an interest rate to one that charges a lower interest rate plus points.
The APR calculates the total cost of the loan over its lifespan. Keep in mind that few people will stay in their house with that loan, so you also need to know the break-even point, which tells you at what point the costs of two different loans are the same. The easy way to determine the break-even point is to divide the cost of the points by the monthly amount saved in interest.