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Cashback and green rates can change the headline comparison between mortgage products. This guide shows a simple way to model them without mixing them into the repayment maths. Treat outcomes as estimates and confirm eligibility and terms with lenders.
Repayments depend on the loan amount, term, and interest rate. Cashback is usually a separate one-off cash item. For planning, model the repayment from the rate and treat cashback as a separate cash-flow line.
This makes it easier to compare products: you can see whether a lower rate wins on monthly cash flow and whether cashback materially changes one-off purchase costs.
A practical scenario comparison includes monthly repayment, stress-tested repayment as a downside check, and total interest under each scenario. Then add incentives as separate cash items and see whether the combined picture still looks better.