Mortgage comparison calculator
The lowest headline rate doesn't always produce the lowest payment-and-fee total. Compare the monthly repayments and product fees for two mortgages across the selected fixed period.
Deal 1
Deal 2
Lower payment-and-fee total
Deal 2 — £1,183 lower
Deal 1 monthly
£1,374
Deal 2 monthly
£1,346
Deal 1 payments + fee
£83,440
Deal 2 payments + fee
£82,257
Payment-and-fee total = monthly repayments over the fixed period + product fee. This is not the full economic cost of the mortgage because it does not compare the remaining balance, cashback, valuations, legal costs, early repayment charges or other product features.
Why rate alone is misleading
A 4.19% rate with a £1,499 fee can produce a higher payment-and-fee total over a two-year fix than a 4.39% rate with no product fee. Over a longer fixed period, the lower rate may have more time to offset the fee. The result also depends on the mortgage balance and term.
What this calculator doesn't include
- Cashback, free legal work or free valuations (which can shift the answer by £500–£1,500).
- Early repayment charges if you exit either deal early.
- Differences in incentives like overpayment allowances or product portability.
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Rate change calculator
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