Mortgage Affordability Rule Of Thumb Testing 2026
The past few years have seen borrowing become more affordable. Interest rates have dropped, mortgage rates have fallen and many a homeowner made the smart decision to lock in a low rate for a fixed term and drop their monthly payments significantly.

Just this April, the Yorkshire Building Society announced its lowest-ever introductory offer of 0.89% on a 65% LTV mortgage, with a Standard Variable Rate of 4.74%, down from 4.99%, as it confirmed it would pass on the 0.25% Bank Base Rate cut to its customers.
The new mortgage affordability testing changes coming into effect aren’t going to alter your repayments immediately, but they may very well make it more difficult to be approved for a mortgage or remortgage.
Check Mortgage Affordability – How Much Could You Borrow?

New Affordability Testing for Mortgages
All lenders must assess your affordability based on a 3% margin above the offered Standard Variable Rate. In the example above with Yorkshire Building Society, you would need to prove you could afford the repayments at a 4.74% interest rate, rather than the discounted rate of 0.89%.
A hypothetical working example of the changes in action…
- Property price: £100,000
- Mortgage: £65,000
- Term: 25 years
- Interest rate of 4.74%
- Monthly repayments of £370.20
Adding the 3% for affordability testing, you’d need to afford £490.54 a month
If it were calculated at the discounted rate, you’d be looking at figures of £241.74 with the 3% additional cushion for interest rate rises, meaning you’d need to afford £339.16 a month.
Because it’s the advertised SVR, though, you need to afford the highest amount possible, and in the example above, that’s a monthly difference of £151.38.

In June of 2017, MoneyFacts.co.uk reported that the average SVR stood at 4.59%. Under the new regulations imposed by the Bank of England, borrowers must be able to afford to repay their mortgages at an average interest rate of 7.59%.
The lowest 10 SVRs, as reported by The Telegraph, are currently:
- First Direct 3.69%
- Barclays 3.71%
- HSBC 3.73%
- Investec 3.75%
- Nationwide 3.75%
- TSB 3.79%
- Halifax 3.79%
- Lloyds 3.82%
- Metro Bank 3.82%
- Scottish Widows 3.83%
- Royal Bank of Scotland 3.83%
Those rates are for mainstream lenders. With bad credit, you need to compare the rates from subprime lenders.
A quick comparison on Money.co.uk showed Precise Mortgages offering a 75% LTV loan with an initial rate of 3.84% on a 3-year fixed-term deal, then reverting to a Standard Variable Rate of 5%.
For affordability testing under the new guidelines, you’d need to prove you could afford the repayments at an 8% rate. Cost-wise, that’s £379.98 per month, but assessed as £501.68, £121.70 higher per month. Or on an annual basis, that’s shy of £1,500.
The subprime sector typically has higher interest rates, which can further increase your repayments, depending on the risk it poses to lenders.
How many homeowners are likely to be affected?
There will be very few in the near future. The Council of Mortgage Lenders reports that the vast majority of mortgages are currently fixed-rate mortgages. 80% of all new regulated lending is on fixed-rate loans, too, so an immediate interest rate increase will not have an immediate impact on household finances. It will when the fixed-year deal ends, though.
4.2 million Mortgages will reach the end of their term either this year or next, so if (or when) the Bank of England raises rates, mortgage costs will rise. They also state that the majority of existing mortgages have sufficient property equity to remortgage at the required Loan to Value, whether that be 60% LTV, 75% LTV, or as high as 90% LTV.
The important thing for those with fixed-rate deals due to expire is to start shopping around.
It’s worth pointing out that you don’t need to wait until your fixed-term deal is nearly up. You can remortgage up to 7 months before your current term ends and take advantage of low interest rates. You will still need to pass the stricter affordability requirements, though.
Whatever rate you see as the advertised interest rate isn’t what you’ll need to prove you can afford. It’s 3% higher than the lender’s Standard Variable Rate, also known as the Reversion Rate.
So, when you are comparison shopping to switch your mortgage, the discounted rate is only part of what’s assessed. You’ll need to look at the lender’s current SVR and add 3% to it to determine whether you will be able to pass the new affordability test.
To make it easier for you to assess the cost of a mortgage, the Money Advice Service has updated its Mortgage Calculator to show you both what you will pay and what you’ll need to be able to afford by giving both figures – the cost to you and the potential cost with the additional 3% added.
Just remember to input the Standard Variable Rate for the offer you’re considering applying for because it’s not based on the introductory rate, which is often lower.
Mortgage Experts Split on How the Change Will Affect Consumers…
Speaking to The Telegraph, “Ian Gordon, a banking analyst at Investec, the specialist bank, said some “at the margins” might see their affordability shrink.”
David Hollingworth, a director at London & Country (mortgage brokers), comments: “Larger lenders won’t be seeing this as a radical change,” he said. “It will mean they won’t be able to consider loosening their stress test if they think competition is edging ahead. That’s what this report is all about.”
Interest rates have dropped to record lows over the past few years. Lenders are increasingly competing to win more customers, raising regulators’ concerns about how far they’re willing to loosen their affordability stress testing.
As a result, the Bank of England has introduced these rules to prevent competition from getting out of hand and reaching a stage of irresponsible lending by playing too loose with affordability testing and setting a minimum of 3% above each lender’s Standard Variable Rate.
This ensures that, in the event of an interest rate rise, consumers won’t be stung so badly that they’re pushed into the unaffordable bracket and forced to sell their home, downsize, or struggle to keep up with repayments. In that respect, it is a good and safe move.
The bad news is that interest rates will rise in the future, and it is likely to cause some lower-income households to struggle to obtain a mortgage.
What You Can Do to Plan for Future Mortgage Offers…
Looking after your credit files is now more important than ever. First Direct currently offers the lowest SVR at 3.69%. Buying a property priced at £125,000 with a £25,000 deposit over 25 years would require an 80% LTV mortgage. At 3.69%, you would need to afford repayments of £687.13 per month.
With adverse credit, you could be pushed towards a 5% SVR with a subprime lender, and affordability would be assessed, as you would need to prove you could afford £771.82 per month in repayments.
An increase of £84.69 per month, and may only be something minor that pushes you into the riskier category when, in reality, you could be considered a Near Prime borrower, rather than requiring a subprime mortgage.
Will the Changes Affect Your Ability to Remortgage?
With more stringent affordability criteria for obtaining a mortgage, you must get your application in front of the best lender most likely to approve it. As a mortgage is a secured home loan, you must be risk-assessed, which requires a hard check on your credit file. Each check lowers your credit score and makes it more difficult to get approved by the next lender you apply to.
1st UK Mortgages works with a diverse panel of lenders, some of whom are available directly, while others offer more flexible borrowing, with favourable rates (as low as 1.19%) available as broker-only deals.
To contact one of our experienced mortgage advisers, use our contact form here, or call us on 0203 129 3081.
Related Reading:
A Comprehensive Guide to Equity Release, Joint Bad Credit History Secured Loans, and Retirement Interest-Only Mortgages in the UK
In the dynamic financial landscape of the UK, individuals are constantly seeking ways to maximise their assets and secure their financial future.
Equity release, secured loans, and retirement interest-only mortgages are three financial tools that can help homeowners do just that. Here’s a detailed look at these financial options tailored for the UK audience.
Unveiling Equity Release
Equity release refers to a range of financial products that allow homeowners, typically over the age of 55, to unlock the equity tied up in their homes. This can be in the form of a lump sum, regular income, or both, without the need to move out.
Benefits:
- Immediate access to a lump sum or additional income.
- No monthly repayments unless chosen.
- Flexibility in using the funds, be it for home improvements, holidays, or gifting.
Drawbacks:
- Reduces the amount you can leave as an inheritance.
- The interest can accumulate, leading to a higher repayment amount over time.
- It may affect entitlement to state benefits.
Can I Release Equity From My House Under 55: Contrary to popular belief, there are options available for homeowners under 55 to access equity. By exploring whether I can release equity from my house under 55, you can understand the criteria, benefits, and potential downsides of such schemes.
Secured Loans Demystified
Secured loans, often known as homeowner loans, are secured against an asset, usually your property. They often allow larger borrowing amounts than unsecured loans and may come with a lower interest rate because the lender has your property as collateral.
Benefits:
- Ability to borrow larger amounts.
- Potentially lower interest rates.
- Suitable for those with imperfect credit scores.
Drawbacks:
- Risk of property repossession if you default.
- Longer repayment terms might accrue more interest over time.
Fixed Interest Loans: If you’re looking to lock in an interest rate for the entirety of your loan, fixed-rate homeowner loan options might be ideal, offering stability in repayments.
Decoding Retirement Interest-Only Mortgages
Retirement Interest-Only (RIO) mortgages are designed for retirees, allowing them to make monthly payments that cover only the loan’s interest. The principal amount is repaid upon sale of the property or when the borrower moves into long-term care.
Benefits:
- Monthly payments can be more affordable because you’re only paying interest.
- There is no set end date for the mortgage.
Drawbacks:
- The capital amount remains outstanding.
- Requires a steady retirement income.
Mortgage For Over 60: It’s a misconception that acquiring a mortgage becomes challenging as you age. With options like the over-55 mortgage, individuals in their 60s can secure appropriate financing.
Mortgages Over 70: Age-specific mortgage options, such as mortgages for the over 70s, ensure that even those in their twilight years have financial tools tailored to their needs.
Ut Bank: For individuals seeking a reliable financial institution for secured loans, the United Trust Bank secured loan offerings are worth considering for their competitive terms.
Remortgaging Deals 2026: As the year unfolds, homeowners looking to remortgage should seek the most competitive rates. For the latest offerings, the cheap remortgage deals 2026 can be an excellent resource.
The world of mortgages and loans might appear convoluted at first, but with the right knowledge, it becomes manageable. Whether you’re a homeowner in your early 50s or someone approaching or enjoying retirement, understanding these financial instruments can help you make informed decisions.
Always consider seeking expert advice tailored to your personal circumstances to ensure your choices align with your long-term objectives.