The Bank of England base rate moves and the news headlines react instantly. Borrowers, less so. The relationship between the base rate and what you actually pay on your mortgage each month is far less direct than many people assume — and understanding the lag, the leverage, and the limits explains why the same headline produces wildly different outcomes for different households.
Bank Rate is 3.75%, held by the Bank of England's Monetary Policy Committee on 17 September 2026.
The base rate is not the mortgage rate
The Bank of England sets the rate at which it lends to commercial banks. Mortgage rates are influenced by that rate, but they are not derived from it. The product you are sitting on determines how much, if at all, a base rate move affects your monthly payment. Trackers move directly with the base rate, up or down, usually within a month. Standard variable rates move when your lender decides — sometimes promptly, sometimes not, and sometimes only partially. Fixed rates do not move at all until your deal ends.
Fixed rates are priced from a different signal entirely
If you are on a fixed-rate deal, your rate was set by reference to the swap market — the price at which lenders hedge future interest rate exposure. Swap rates reflect what the market expects the Bank of England to do over the coming years, not what it has just done. A widely-anticipated base rate cut barely moves swaps, because the market already priced it in weeks earlier. The headlines move; the swap rates have already moved. This is why fixed-rate deals sometimes get cheaper before a cut, and sometimes get more expensive after one.
What to do depends on what you're on
If you are on a tracker, the change flows through to your direct debit within one billing cycle. Expect to see it on your statement next month. If you are on a standard variable rate, watch your lender's website — many announce within days, with effective dates a few weeks out. If you are on a fix, nothing changes until your deal ends, at which point your new options depend on where swap rates are at that moment, not where the base rate is.
The decision that matters
For many mortgage holders, the moment that matters is not the base rate announcement. It is the day their existing deal ends. A quarter-point change in Bank Rate adds or removes about £21 a month in interest per £100,000 owed on a tracker. Re-fixing onto the wrong product can cost more than that, month after month, for two to five years. Spending time on the headlines while ignoring the renewal calendar is a common and costly inversion of attention.
Base rate moves are noisy and infrequent. The structural question — what is the right product for the next stage of your life — is quieter and far more valuable.
Reviewed 19 October 2026. Figures correct as at this date.