You're missing the point, or you didn't read the post. A 15-year payment is higher, of course, but after 15 years you've paid it all off. After 5 years, much o

You're missing the point, or you didn't read the post. A 15-year payment is higher, of course, but after 15 years you've paid it all off. After 5 years, much of your payment is going towards principal, not interest. You can do this calculation in a spreadsheet. The question is: when rates go up, at what point does the new 30-year monthly payment equal the old 15-year, when rates are lower? > If budget allows, you can make additional payments towards the principal. I said that. Most people will not, but YMMV.