What is a mortgage stress test and how do I pass it?
Last reviewed 8 July 2026 · Compare Mortgage Rates editorial team
This guide looks at the topic through a rate-comparison lens, with emphasis on total cost, eligibility and lender criteria rather than headline rates alone.
Every UK mortgage application goes through a stress test — lenders check that you could still afford the monthly payment if rates rose. Since 2022 these tests have tightened, which is the single biggest reason borrowing capacity has fallen.
What the stress test does
The lender re-calculates your monthly payment at a higher rate — typically the SVR plus 1–3% — and checks affordability against that bigger number, not the actual product rate.
The 2022 change
The FCA removed the mandatory 3% stress test in August 2022, but most lenders kept their own version. Combined with higher base rates, this is why a £400k loan in 2020 might only stretch to £320k today on identical income.
What you can do
- Clear small debts — every £100/month commitment removes £15k–£25k of borrowing.
- Stop using overdraft — lenders flag persistent overdraft use in the 3 months before applying.
- Choose a longer term — pulls the stressed monthly payment down.
- Compare lender criteria — stress models vary considerably. A broker who knows the market can explain which lenders may fit your circumstances.
- Consider a 5-year fix — some lenders stress 5-year fixes at the product rate rather than a higher stressed rate.
Frequently asked questions
What is a mortgage stress test? +
A stress test is a lender's check that your mortgage may remain affordable if rates or payments rise. Each lender sets its own approach within regulatory expectations.
Can I pass a stress test by choosing a longer mortgage term? +
A longer term may reduce the monthly payment used in affordability checks, but it can increase total interest paid and does not guarantee acceptance.