Interest and partial capital

In the U.S. a partial amortization or balloon loan is one where the amount of monthly payments due are calculated (amortized) over a certain term, but the outstanding capital balance is due at some point short of that term. In the UK, a part repayment mortgage is quite common, especially where the original mortgage was investment-backed and on moving house further borrowing is arranged on a capital and interest (repayment) basis.