Tweak and modify how best to manage extra repayments and lump sum savings held in an offset account with this mortgage calculator.
And, for more complex financial positions where bad debts and multiple good debts are held this calculator can become very effective at hypothetically managing a repayment scenario to extinguish the non-tax deductible debt at a greater rate thus giving a much more favourable tax position over the longer term.
(for example; we have a $100,000 mortgage left and we would love to pay this off as quickly as possible. We also have an investment property or asset that we could manage the existing repayment scenario to redirect all surplus income to our mortgage consequently utilising these extra repayments along with our existing repayments reducing and extinguishing our mortgage much quicker)