I totally agree and probably posted at least some of the advice to which you refer. There have been several examples here and elsewhere of people chucking money into their mortgage assuming that it was chipping away at the capital but discovering later that it was not. If you want to accelerate the repayment of the capital by making lump sum or regular additional capital repayments then agree this in writing with your lender. You don't necessarily have to reschedule the loan as such but the accelerated capital repayment strategy will reduce the effective term and will reduce the overall interest costs of the mortgage. If you have no other higher cost debts, you have the disposable income spare and don't have anywhere better for it (e.g. tax deductible pension contributions) then it's a good way to "save" money.