Are other lenders likely to follow HSBC in reducing buy-to-let stress test criteria, creating more favourable lending conditions for landlords?
Quick Answer
It is unlikely that most other lenders will broadly follow HSBC's recent reduction in BTL stress test criteria. The Bank of England base rate at 4.75% and typical BTL mortgage rates between 5.0-6.5% mean lenders remain conservative with their affordability assessments.
## Current BTL Lending: Stress Test Criteria and Market Conditions
The current standard Buy-to-Let (BTL) stress test requires rental income to cover 125% of the mortgage payment, calculated at a notional rate of 5.5%. As of December 2025, the Bank of England base rate stands at 4.75%, and typical 2-year fixed BTL mortgage rates are between 5.0-6.5%, with 5-year fixed rates from 5.5-6.0%. While HSBC recently adjusted its stress test for certain products, this move has not been widely replicated across the market.
Lenders base their stress test criteria on a range of factors, including the Bank of England base rate, anticipated future rate movements, their own cost of funds, and regulatory capital requirements. The 125% at 5.5% threshold is a common benchmark designed to ensure landlords can cover mortgage costs, even if interest rates rise or rental income experiences fluctuations. This is particularly relevant now given the persistent inflation and the potential for a higher-for-longer interest rate environment.
### What are the current BTL stress test calculations?
Most BTL lenders assess affordability by requiring the rental income to cover at least 125% of the monthly mortgage payment. This is usually calculated using a notional interest rate, which is often higher than the actual pay rate to build in a buffer. For instance, if a property generates £1,000 in monthly rent, the maximum mortgage payment allowed would be £800 (£1,000 / 1.25).
If the notional rate applied is 5.5%, a £200,000 interest-only mortgage would have a notional payment of approximately £917 per month (£200,000 * 0.055 / 12). For this mortgage to pass the stress test, the property would need to generate at least £1,146.25 in monthly rent (£917 * 1.25). These calculations aim to mitigate risk for both the lender and the investor.
## Impact on Investor Borrowing Capacity
The stringent stress test criteria directly impact an investor's borrowing capacity and, consequently, the number of BTL mortgage options available. A higher stress test rate means that a property needs to generate more rental income to support the same level of borrowing, or the investor must provide a larger deposit.
For example, if a lender applies a 145% stress test at 6.0% (a figure some lenders still use), a property with £1,000 rental income could only support a maximum mortgage payment of £689.66 (£1,000 / 1.45). This directly reduces the amount a landlord can borrow compared to the 125% at 5.5% calculation, limiting potential portfolio growth or requiring more capital upfront. Understanding these differences is critical for property investors when assessing their financial viability for new acquisitions or refinancing options.
### Are other lenders likely to follow HSBC?
It is unlikely that the majority of other lenders will significantly reduce their BTL stress test criteria in the short term. The current Bank of England base rate is 4.75%, and while HSBC's move was for specific products, the broader market remains risk-averse. Many lenders are currently operating with BTL mortgage rates ranging from 5.0% to 6.5%, meaning a 5.5% notional rate is still comparable to, or even below, some current offerings. Lenders are more likely to adjust their product offerings or rates based on market stability and their individual risk appetites, rather than universally lowering stress tests without a sustained drop in the base rate or a significant increase in market confidence. This is particularly true given the Bank of England's cautious outlook on inflation.
### Does this affect all buy-to-let properties?
The BTL stress test criteria apply to almost all standard buy-to-let mortgages for individual landlords or limited companies. The specific percentage and notional rate used can vary between lenders, even if the industry standard is 125% at 5.5%. Certain specialist products, such as those for portfolio landlords or specific types of Houses in Multiple Occupation (HMOs), might have slightly different, sometimes more stringent, criteria. New build properties or properties in areas with low rental demand might also face higher stress tests. It is essential to check explicit terms for each product, as the mortgage market is continually segmented based on risk profiles, affecting various property types.
## Investor Rule of Thumb
Ensure your rental income comfortably covers at least 125% of your mortgage payment calculated at a notional rate above current pay rates, providing a buffer against rate increases and voids. This allows you to manage cash flow effectively and avoids surprises, considering buy to let mortgage calculations and landlord profit margins.
Steven's Take
HSBC's decision to tweak its stress test criteria for some BTL products is a specific market move, not necessarily a trendsetter for the broader industry. We're still operating with a 4.75% Bank of England base rate, and BTL mortgage rates are elevated at 5.0-6.5%. Most lenders will remain cautious, sticking to the standard 125% at 5.5% or even higher, to protect against future rate hikes. Don't assume borrowing conditions are easing across the board. Always do your buy to let mortgage calculations based on conservative rental income and higher notional rates to ensure your portfolio remains resilient. Relying on one lender's specific product could be risky if your portfolio relies on broader market access.
What You Can Do Next
Review your current portfolio's stress test compliance: Calculate 125% cover at 5.5% for all your BTL properties using your current loan amounts and rental incomes to identify any potential refinancing challenges.
Engage with a specialist BTL mortgage broker: Brokers have up-to-date knowledge of diverse lender criteria and might identify specific products that suit your portfolio, including those with bespoke stress tests. Search for 'BTL mortgage broker' via unbiased.co.uk.
Monitor Bank of England communications: Stay informed about potential shifts in the base rate by checking the Bank of England website (bankofengland.co.uk), as this significantly influences lender stress test policies.
Research individual lender criteria: Prior to applying for new finance, directly check the precise stress test and rental coverage requirements of specific lenders you are considering, as they can vary; for example, Nationwide's intermediary website provides detailed criteria.
Get Expert Coaching
Ready to take action on financing & mortgages? Join Steven Potter's Property Freedom Framework for comprehensive, hands-on property investment coaching.