SWAP Rates
The rates at which banks exchange fixed for variable interest payments. They reflect market expectations of future base rates and drive the pricing of fixed-rate mortgages.
When a lender offers a two-year or five-year fixed mortgage, it typically hedges that commitment in the swap market, exchanging a fixed stream of payments for a variable one. The price of that hedge, the SWAP rate, becomes the raw material cost of your fixed rate. Lender margin, fees, and risk appetite sit on top.
Why this matters more than the base rate
Fixed mortgage pricing follows expectations of where the base rate is going, not where it is today. That is why fixed rates sometimes fall while the base rate holds still, and why they can jump on inflation data or political events before any Monetary Policy Committee meeting happens. The repricing waves in BTL mortgages during 2026 tracked SWAP movements, not base rate changes.
Using this as a landlord
Watching two-year and five-year SWAP rates gives you a preview of where fixed-rate products are heading over the following weeks. Falling SWAPs with lender margins intact usually mean cuts are coming; a sudden SWAP spike is the signal to lock a product before ranges are repriced. Most brokers will quote current SWAP levels if asked, and several trade publications publish them daily.