Part & Part Mortgage Calculator
Work out your monthly payments when splitting your mortgage between repayment and interest-only.
A part and part mortgage splits your loan into two portions with different repayment methods, running side by side over the same term. One portion works like a normal repayment mortgage, so you pay it off in full by the end of the term. The other portion is interest-only, meaning your monthly payments only cover the interest, and the original amount borrowed on that portion is still owed when the term ends.
Use the calculator above to see how splitting your loan between repayment and interest-only affects your monthly payments, and what balance would remain on the interest-only portion at the end of your term.
Please note, this calculator gives a guide figure only. It assumes a single interest rate across both portions of the loan, and actual lender products, rates and criteria vary.
If you’re weighing up whether a part and part mortgage is right for you, get in touch with our team. We’ll talk you through your options and find the right structure for your situation.
FAQ: Part & Part Mortgage Calculator
Who is a part and part mortgage suitable for?
It suits people who want lower monthly payments than a full repayment mortgage but more security than a fully interest-only one. It also works well if you're expecting a lump sum in future, such as an inheritance, a bonus, downsizing, or an investment maturing, and want to use it to clear part of the loan.
Can I change the split between repayment and interest-only later?
Some lenders allow you to adjust the split during the mortgage, often at renewal or through a formal request, though this isn't guaranteed and criteria vary by lender. If flexibility matters to you, it's worth raising with us before choosing a lender so we can point you toward products that allow it.
This information is a guide only and should not be relied on as a recommendation or advice that any particular mortgage is suitable for you. All mortgages are subject to the applicant(s) meeting the eligibility criteria of the specific lender. You should make an appointment to receive mortgage advice which will be based on your needs and circumstances.