No - the repayments stay the same but initially most of the repayment goes on interest and a little on capital but as the capital is chipped away the interest:capital repayments ratio decreases. At the end of the mortgage most of each monthly repayment goes on capital and a little on interest. For example at the very start of the mortgage 99% of the repayment might go on interest and 1% on capital. At the end it would be the other way around. See Karl Jeacle's mortgage calculator's amortisation graph for further explanation.