Expat mortgage calculator
Estimate the loan, monthly payments and currency effect on an expat mortgage using your own figures. The interactive calculator is coming soon.
Reviewed by David Sampson, Founder & Director · Created 20 October 2026 · Last reviewed 20 October 2026
How an expat mortgage calculator works
An expat mortgage calculator estimates the loan, the monthly payment and how that payment looks in the currency the borrower is paid in. It uses the property price, deposit, interest rate, term and whether the loan is interest-only or repayment, together with an exchange rate and a buffer to allow for that rate moving over time.
The figures are estimates based on the inputs entered. Lenders use their own stressed rates, currency adjustments and income rules, so a calculator result is a starting point rather than an offer.
Allowing for exchange rates
Allowing for exchange rates means testing the monthly payment against income at a less favourable rate than today's, because pay in a foreign currency can buy fewer pounds if the rate moves. Lenders do something similar by reducing foreign income in their calculations. Entering a buffer shows how much headroom remains if the currency weakens.
The same applies to a deposit held in a foreign currency, which can change in value before it is moved to sterling.
Expat buy-to-let and rent cover
For an expat buy-to-let, the calculator compares the expected rent with the monthly interest, which is how lenders set the maximum loan. Lenders use a stressed rate and a set margin, both of which vary by lender and borrower, so the same property can support a different loan with each.
How lenders assess rent, income and deposits for expat landlords is covered on the expat buy-to-let mortgages page, which explains rent tests in more detail.
Frequently asked questions
How much can I borrow as an expat?
It depends on overseas income, the currency, the deposit, the lender's criteria and, for buy-to-let, the rent.
Do lenders reduce foreign currency income?
Many do, to allow for exchange rate changes, and some do not accept certain currencies.
Is the calculator result a mortgage offer?
No. It is an estimate based on the figures entered. Lenders apply their own criteria and rates.
Can I use the calculator for an expat buy-to-let?
Yes. The finished calculator will include rent cover for buy-to-let purchases.
Does the calculator include stamp duty?
No. Stamp duty, including non-resident and additional property surcharges, needs working out separately.
Can I enter my own exchange rate?
Yes. The finished calculator will use an exchange rate and buffer entered by the user.
Important: Your home may be repossessed if you do not keep up repayments on your mortgage. Information on this page is for general guidance only and does not constitute financial advice.Always verify details directly and seek independent advice before making financial decisions.