Remortgaging a Buy-to-Let Portfolio in Summer 2026: How to Time Your Deals

Around 1.8 million fixed-rate mortgages come up for renewal in 2026, and a meaningful share of those are buy-to-let deals fixed back in 2021, when rates sat two to three percentage points below where they are now. For a portfolio landlord juggling four, ten or thirty of these renewals at once, the remortgage decision this summer is not just about finding the lowest headline rate. It is about timing, and about which properties will actually pass the lender's affordability test.

The Scale of the Problem, and Why Timing Now Is Tricky

UK Finance's 2026 forecast puts the total expiring fixed-rate cohort across the whole mortgage market at around 1.8 million loans, with buy-to-let forming a meaningful slice of that total. Many were locked in during 2021's ultra-low rate window. A landlord who fixed a £150,000 mortgage at 2% back then was paying roughly £250 a month in interest. Rolling onto a typical rate of around 4.5% today pushes that to about £562 a month, a gap of £312 that has to come from somewhere, usually rent or reserves.

Here is the complication. Through June and the first half of July, a run of lender cuts brought pricing down steadily, with best-buy two-year deals briefly dipping into the high-2% to low-3% range at lower loan-to-value bands. If you read an article from early July, you would reasonably expect that trend to still be running. It is not. Since mid-July, several lenders, including some of the bigger BTL names, have been raising rates again, driven by a sharp rise in swap rates tied to renewed tension in the Middle East rather than anything the Bank of England has done. If you are pricing a deal this week, work from current quotes, not from the "rates are falling" headlines of a month ago.

What the July 30 MPC Decision Actually Changed

Frequently Asked Questions

Should a portfolio landlord fix for 2 years or 5 years in 2026?

There is no universal answer, but the stress test often tips the decision. Many lenders test 5-year fixes against the actual pay rate, or pay rate plus a small margin, rather than the standard 5.5% floor applied to 2-year deals. That can mean a 5-year fix passes the portfolio-wide affordability check where an equivalent 2-year deal does not, even before you weigh up the rate itself.

What happened at the July 30, 2026 MPC decision?

The Bank of England held the base rate at 3.75% for a fifth consecutive meeting. The vote was 6-3, with the Bank's Chief Economist Huw Pill, external member Megan Greene, and Catherine Mann all voting to raise to 4.0%. That is a more hawkish split than the market had been pricing in the days before the decision.

Are buy-to-let mortgage rates still falling in August 2026?

No. After a run of cuts through June and early July, BTL pricing reversed from around mid-July, with several lenders raising rates in response to a sharp rise in swap rates linked to renewed Middle East tension. Landlords who assume the spring's cutting trend is still running should check current pricing carefully before applying.

What ICR stress rate applies to a portfolio landlord's whole book?

Once you hold four or more mortgaged buy-to-let properties, most lenders assess ICR across the full portfolio under PRA Supervisory Statement SS13/16, not just the property you are remortgaging. The standard floor is the higher of 5.5% or the reversion rate plus 2 percentage points, applied property by property across the book.