Savings Interest Calculator Pay Off Mortgage In 15 Years, Or 3 Years Taking Into Account Tax Savings And Interest Savings.?

Pay off mortgage in 15 years, or 3 years taking into account tax savings and interest savings.? - savings interest calculator

I am looking for an online mortgage calculator to help you which option is best: 1) If you distribute and pay the mortgage in 15 years, or 2) if you pay less quickly 3 years.

I need to take into account both tax and interest savings. Calculators I've found have not yet taken into account when you make a comparison, but I need two points, and also something that takes into account the investments. Does anybody know where to find something?