The base rate has increased from 4.5% to 5% - the highest rate since 2008. The base rate is what banks across the UK use to set their interest rates on borrowing. This therefore affects mortgage interest payments for property owners - including landlords. The base rate increase intends to help lower inflation - but the higher the base rate, the more money landlords and homeowners hand over to cover their mortgage interest rate costs.
Buy-to-let investors on fixed-rate mortgages normally have a two or five-year agreement. That means that, until their agreement ends, they're safe from any price increases.
However, the average rate for a five-year fix was 3.17% in May 2022. That jumped to 4.97% in May 2023 - while reports show that a two-year fixed-rate mortgage in the UK rose above 6%, the highest rate since December.
That's a large difference for landlords to absorb when they come to remortgage - especially if stress tests were to also rise.
A stress test looks at whether a landlord looking to borrow for a mortgage would be able to afford their monthly repayments - plus other budgeted expenditure - if mortgage rates were to increase by a certain percentage.
Natwest is just one bank that's revised its remortgage stress tests from 6% to 7.54% - although other banks are still below this rate.
Any landlords currently on a tracker or variable mortgage will be affected more quickly as they are directly affected by any changes to the base rate.
Approximately 1.1 million people in the UK are either on a base-rate tracker or discounted-rate deal. Around 1.1 million more are on the standard variable rate (SVR) of their provider.
New research shows that over three-quarters of landlords plan to choose a fixed-rate plan when they remortgage.
The length of fixed-rate mortgages that landlords are choosing reflects this trend further. Thirty-two percent of landlords are now considering shorter two-year fixed rate deals - up from 13% in last year's survey.
Only 4% of landlords are opting for tracker mortgages.
The base rate hinges on the rate of inflation - the rate at which the average cost for standard household items is rising. If that rate slows, base rates are more likely to drop. However, it won't be immediate - and the government's rate of inflation is 2%.
With inflation sat at 8.7%, this is still far above the ideal - and therefore, the base rate is likely to stay high for the foreseeable.
The changes to section 24 mean that property investors can now be taxed even if their property is operating at a loss.
In a scenario outlined by Hamptons, an "average higher-rate tax paying landlord" on a 6% mortgage would be able to turn a profit of approximately £695 if they could still deduct finance costs before tax. Instead, they're now faced with an £850 loss per year.
Hamptons data shows that younger investors - that tend to maximise their borrowing to afford a buy-to-let property - will be harder hit than older landlords when the base rate is increased.
As older landlords leave the market, this suggests that new, younger landlords may struggle to get their foot in the door. Combined with the impact of section 24 affecting the profitability of properties, this will likely have a detrimental effect on the stock of private rental properties on the market.
Research commissioned by the National Residential Landlords Association (NRLA) found that a third of private landlords in England and Wales planned to cut the number of properties they let. Only 10% said that they'd plan to increase the number of properties they rent to tenants.
Only time will show the true long-term impact on landlords of the fluctuating base rate and unpredictable mortgage costs.
For a better understanding of what's encouraging landlords to leave the sector - and solutions for the government - read our 10-point plan in Renting Done Right.