The Mortgage Plan Calculator helps you plan how you can go about paying for your mortgage by allowing you to compare different situations which you may come across such as higher interest rates or a new mortgage.
Start by clicking 'Add Mortgage' under 'Personal Mortgage Debt'. From there, select and fill out the required details and click 'Save'. You can also the same for 'Rental Mortgage Debt' if you have any rental properties.
Once you have added all of your mortgages, scroll down to select the Scenario you want to compare your current position with. This could be a Scenario wherein you are paying higher interest rates, getting a new mortgage, or perhaps one when you've finished paying off one of your mortgages.