Have Buy-to-Let Mortgage Rates Finally Peaked?
RealYield Team
Property Analyst
The direction has shifted. Whether that shift lasts is a different question.
SWAP rates peaked in early April 2026 after the Middle East conflict pushed energy prices higher and rattled UK inflation expectations. Lenders pulled products and raised pricing. Buy-to-let borrowers faced some of the highest average rates in two years. Then the Bank of England held at 3.75% on 30 April. SWAP rates stabilised. Lenders started cutting again.
So yes, buy-to-let mortgage rates appear to have peaked. But there are three things landlords need to understand before acting on that conclusion.
What Drove the April Spike
Fixed-rate mortgages are priced off SWAP rates, not directly off the Bank of England base rate. SWAPs reflect market expectations for where interest rates will be over the fixed term. When those expectations shift, SWAP rates move quickly and lenders follow.
In early April 2026, two-year SWAP rates reached around 4.24%. Five-year SWAPs peaked near 4.18%. The trigger was the escalation of the Middle East conflict. Higher oil and gas prices fed through to UK inflation expectations. March CPI came in at 3.3%, up from 3.0% in February. The Bank's own Monetary Policy Report in April warned that inflation was "likely to be higher later this year."
Lenders responded fast. Around 1,300 buy-to-let products were withdrawn between early March and late April as lenders pulled deals rather than hold them at prices they could no longer fund profitably. BTL product count fell from a peak of around 5,529 to 4,764 by 27 April (Moneyfacts). Average rates moved up to 5.46% on two-year fixed deals and 5.76% on five-year fixes (Moneyfacts, 10 April 2026). Both were at their highest level in roughly two years.
Where SWAP Rates Are Now
The Bank of England's April 30 decision to hold at 3.75% did not trigger a sharp SWAP rate fall. Markets had mostly priced in a hold. What it did do was remove the immediate upside risk: the threat of a base rate rise that would have pushed SWAPs higher. That gave lenders enough certainty to start trimming.
Two-year SWAP rates are now around 3.40%, down from the April peak of 4.24%. Five-year SWAPs are around 3.55%, down from roughly 4.18% (MFB Money Markets, post-BoE decision). The easing is real. But it is partial. SWAPs have not returned to pre-conflict levels and the cuts happening at lender level are targeted rather than sweeping.
Frequently Asked Questions
Have buy-to-let mortgage rates peaked in 2026?
The direction appears to have shifted. SWAP rates eased from a peak of around 4.24% (2-year) and 4.18% (5-year) in early April 2026 to roughly 3.40% and 3.55% respectively after the Bank of England held at 3.75% on 30 April. Multiple lenders have cut selected BTL products since then. But average rates remain elevated (5.46% two-year, 5.76% five-year as of 10 April 2026), Huw Pill's hawkish MPC dissent signals real upside risk, and April CPI data due 20 May could shift pricing quickly. The baseline has not fallen.
Why did buy-to-let mortgage rates spike in March and April 2026?
SWAP rates, which lenders use to price fixed-rate mortgages, rose sharply as the Middle East conflict pushed energy prices higher and raised UK inflation expectations. March 2026 CPI reached 3.3%, and the Bank of England warned inflation was 'likely to be higher later this year'. Lenders responded by withdrawing products and raising pricing, with around 1,300 BTL deals pulled between March and late April.
What is the current ICR stress rate for buy-to-let mortgages?
The minimum ICR stress rate remains 5.5% across mainstream and specialist BTL lenders in 2026, unchanged by the Bank of England's April decision. This comes from PRA Supervisory Statement SS13/16. Even if average BTL rates ease below 5.5%, your affordability assessment still runs against the stress rate floor.
When is the next Bank of England interest rate decision?
The next MPC decision is 18 June 2026. Market pricing at the time of the April decision pointed to another hold. April CPI data (due 20 May 2026) is the key input before that meeting. A surprise in either direction could shift expectations.
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