Always Ask About Fees And Charges On Your Loans.Pt 2

For simplicity, let's use 5% and 5.5% over a thirty year period with interest only. 

Withn$400,000 at 5% over 30 years that's $600,000 dollars.

At 5.5% over the same period is $660,000.

So you could potentially pay an extra $60,000. Of course, inflation will reduce the impact of that amount. As will paying off the capital portion of the loan, usually the amount you originally borrowed.

A good broker can help you with this.