Sm, A mortgage loan is not Simple Interest... An auto loan is more like simple interest although they screw you using rule of 78... Mortgage loan calc is: <A HREF="http://mathforum.org/library/drmath/view/54623.html" target="_new">http://mathforum.org/library/drmath/view/54623.html</A> Rule of 78: <A HREF="http://www.pine-grove.com/pi09003.htm" target="_new">http://www.pine-grove.com/pi09003.htm</A> You should always check with the Mortgage Co. / Bank to see how they handle early payoffs, they are not all the same... JMO