Why Mortgage Rates Do Not Simply Follow The Base Rate

If you have been watching the Bank of England base rate and assuming your mortgage rate will move in step with it, you are not alone. Most buyers make the same assumption. The truth is more complicated, and understanding it can save you real money and prevent some nasty surprises when you come to make an offer.

The base rate is only one piece of the puzzle

The base rate, held at 3.75% since December 2025, sets the cost at which banks borrow from the Bank of England overnight. It matters, but lenders do not price fixed-rate mortgages against it directly. They price against something called swap rates, which reflect what it costs a lender to fix the cost of money over a set period, typically two or five years. Swap rates are traded in financial markets every day, and they move independently of whatever the Monetary Policy Committee decided last month.

Beneath swap rates sits another layer: gilt yields. Gilts are UK government bonds, and their yields (the return an investor demands to hold them) act as a floor beneath most long-term borrowing costs in the economy. When investors grow nervous about inflation or government finances, they demand a higher yield to hold gilts. That pushes swap rates up, and lenders pass the higher cost on to borrowers.

What happened to fixed rates in 2026

The gap between the base rate and what buyers actually pay widened sharply this year. The average two-year fixed rate sat at around 4.25% in February 2026. By late October it had climbed to approximately 5.97%. The base rate did not move. What moved was the bond market.

A combination of factors unsettled investors. CPI inflation came in at 3.5% in September 2026, well above the Bank of England's 2% target, raising doubts about how quickly rates would fall. Geopolitical tensions added to the uncertainty, prompting investors to demand higher returns on long-dated assets including gilts. As gilt yields rose, swap rates followed, and fixed mortgage pricing followed those.

This is not unusual behaviour. The same thing happened in late 2022 after the mini-budget. Financial markets can reprice faster than any central bank acts, and fixed-rate mortgage products sit at the sharp end of that repricing.

Tracker mortgages behave differently

A tracker mortgage follows the base rate directly, usually expressed as a margin above it (for example, base rate plus 0.75%). Because it is not priced off swap rates, a tracker can look attractive when swap rates are elevated but the base rate is relatively low. The trade-off is that your monthly payment moves if the base rate moves. If the Bank of England cuts in the months ahead, you benefit immediately. If it raises rates, your payment goes up.

Trackers are not right for every buyer. If you need certainty over your monthly outgoings, a fixed rate gives you that. If you have some flexibility and believe rates are more likely to fall than rise, a tracker is worth discussing with a broker. It is not an either-or decision that you have to make alone.

What you should do right now

Given the pace at which rates have moved this year, there are three practical steps worth taking before you make an offer on a property.

• Get a mortgage in principle early. A mortgage in principle (sometimes called an agreement in principle) gives you a lender's initial confirmation of how much they will lend, based on your income and credit profile. It costs nothing, does not commit you, and means you can move quickly when you find the right property. Rates can change between your offer being accepted and your formal application, so getting the process started early reduces that window.
• Ask about tracker products. Even if you ultimately choose a fixed rate, understanding the tracker options available to you gives you a better basis for comparison. Ask your broker to show you both side by side.
• Get advice before making an offer, not after. A lot of buyers speak to a mortgage broker only once a sale is agreed. By then you have less time and less leverage. Speaking to a broker before you start viewing seriously means you already know your budget, your likely rate, and your options.

The November 2026 Bank of England decision

The Monetary Policy Committee meets in November 2026, and the market will be watching closely. If inflation data softens before that meeting, there is a possibility of a cut. If it stays sticky, rates may hold or even rise. Either outcome will feed through to swap rates and, in time, to fixed mortgage pricing.

Watch that date, but do not let it freeze your plans. The right mortgage for you depends on your circumstances, not on trying to call the next central bank move. Speak to our team or an independent broker, get your mortgage in principle in place, and make your decisions with current, specific advice rather than headlines.