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Prepaying a loan: Shouldn't the interest be recalculated like a shorter loan?
Loans do not carry an "interest balance". You can not pay off "all the interest". The only way to reduce the interest to zero is to pay off the loan. Otherwise, the interest due each month is some percentage of the outstanding principal. Think of it from the bank's perspective: they've invested some amount of money in you, and they expect a return on that investment in the form of interest. If you somehow paid in 16 years all the interest the bank expected to receive in 30 years, you've been scammed.