Prepare · Calculator 07

What could happen when your mortgage rate changes?

Project the balance at the end of a mortgage deal, compare rate scenarios and explore one-off or monthly overpayments.

1 Enter your figures2 Review assumptions3 Explore the result

Your figures

1. Check for urgent mortgage problems

This illustration is designed for planning ahead, not for resolving missed or unaffordable payments.

Mortgage arrears or urgent payment problems?

2. Enter the mortgage today

This version models a standard capital-and-interest repayment mortgage.

Current mortgage balanceEstimated property value

Current mortgage rate

Current monthly payment

3. Model the reset

Enter an illustrative follow-on rate and term. These are assumptions, not a mortgage offer or rate forecast.

Months until the current deal ends

Assumed new rate

Remaining term after reset

One-off overpayment at resetOngoing monthly overpayment

Annual property-price change

Your entries remain in this tab and are cleared when the tab closes.

Illustrative monthly payment after reset

£1,187/mo£1,187 contractual payment plus £0 optional overpayment at an assumed 4.5% rate.

Change from current payment+£197/mo

Estimated balance at reset£213,546

Estimated LTV at reset60.4%Illustrative—not a lender valuation

Months4.5% assumption3.0% scenario6.0% scenario

Hover over or focus a point to see its exact value.

3.0% rate£1,013/mo26 years from today · £95,678 interest

4.5% rate£1,187/mo26 years from today · £147,968 interest

6.0% rate£1,376/mo26 years from today · £204,645 interest

Estimated property position at reset

£353,500 valueThe LTV estimate uses your property-price assumption. A lender’s valuation, product criteria and available rates may differ.

Assumptions used

Interest is added monthly before each payment.
The current rate and payment remain unchanged until the entered reset month.
The new contractual payment fully repays the balance over the entered term; optional overpayments shorten the path.
Lower and higher scenarios are 1.5 percentage points either side of the selected new rate.
Fees, early-repayment charges, overpayment limits, tax and lender affordability checks are excluded.

This is a cash-flow and balance illustration for a repayment mortgage. It does not show which products you could obtain or whether changing a mortgage would be suitable.