How do I amortize my refinanced home loan?

Q: I recently refinanced my home to take advantage of the lower interest rate and paid 2 points. I understand that I must amortize these points over the life of the loan. In my case 15 years. However, I am making extra monthly payments so that I will pay off my note in about 12.5 years. I file Schedule A with my return. Can I deduct my points based on 12.5 years instead of the 15 years? -thanks. —Mike, Norwood

The following answer was provided by Mark Misselbeck, CPA, Levine Katz Nannis & Solomon PC, Needham.

A: I believe that you would be justified, but in case of question by the IRS, you would need to be able to produce an amortization schedule and proof of payments that would support your position.