Waiting for mortgage rates to fall? Why 17 September probably won't be the day

On Thursday 17 September, just after midday, the Bank of England will announce its next decision on interest rates. If you have a mortgage, or are waiting to fix one, you have probably absorbed the general mood that rates are on the way down. The awkward truth is that they are not, at least not yet. The market expects the Bank to hold, some of its own rate-setters want to go the other way, and either way the base rate is not the number that decides what most people actually pay.

The base case is a hold, and the risk is upward

The base rate has sat at 3.75 per cent since the spring, held five times in a row. At the last meeting, on 30 July, the Monetary Policy Committee voted 6 to 3 to keep it there, but the three who disagreed, Huw Pill, Megan Greene and Catherine Mann, did not want a cut. They wanted to raise it to 4 per cent. A Reuters poll of economists then found nearly 90 per cent, 56 of 64, expecting no change at all for the rest of 2026.

The reason is that inflation has stopped falling. Headline CPI ticked back up to 2.9 per cent in July, as we covered in inflation is back up to 2.9 per cent, and services inflation in particular has proved sticky. The Bank is caught between a soft economy, which argues for cuts, and prices that will not settle, which argues against them. Faced with that, holding is the path of least regret. A September cut would be a genuine surprise.

The thing almost everyone gets wrong

Here is the point that undoes most of the hoping. The base rate does not set your mortgage rate. It sets the floor for two specific kinds of borrowing, and the rate on a fixed deal is not one of them.

Tracker mortgages and standard variable rates move with the base rate, and quickly. If you are on one of those, a hold means your payment sits still, and a rise would push it up within weeks. Fixed rates are a different animal. They are priced off swap rates, which are the market's bet on where interest rates are heading over the next few years, not where they are today. Swap rates have been jumpy through 2026, rising sharply when the conflict in the Middle East flared, the same shock that pushed up energy bills and inflation. So fixed deals can climb even while the base rate stands still, and a base-rate cut would not automatically drag them down. When you read that rates are falling, that is a forecast about swaps, not a promise about your next fix.

What a move is actually worth

It helps to put real numbers on it. The table below runs a £200,000 repayment mortgage over 25 years through our mortgage calculator at a range of rates, from a sharp fixed deal to the average standard variable rate.

Two things stand out. First, the base rate moves in steps of 0.25 percentage points, and on this mortgage one such step is worth about £29 a month, roughly £344 a year. That is real money, but it is a good deal smaller than the drama around each decision suggests, and it is why even the cut people are wishing for would land softly.

Second, the gap that really matters is not between one base-rate decision and the next, it is between a fix and a standard variable rate. A 4.5 per cent fix costs about £1,112 a month here; the average SVR of 7.13 per cent costs about £1,430, some £318 more a month, or nearly £3,800 a year. If you have slipped onto your lender's SVR while waiting for rates to fall, that wait is one of the most expensive things in personal finance.

What to do while the Bank sits still

If your fix is ending, the honest move is to shop the remortgage now rather than betting on a September cut that almost no economist expects. Best-buy two and five-year fixes were around 4.3 to 4.6 per cent in early September, according to Uswitch, well below the SVR you would roll onto by doing nothing.

If you are already on an SVR, the table is the argument: a fix will almost certainly cost less today, and it removes the risk of a rise if the three hawks on the committee get their way.

And if your rate is fixed and comfortable, the interesting question is what to do with spare cash while rates are not falling. Overpaying a mortgage is effectively a guaranteed, tax-free return equal to your mortgage rate, which at 4 or 5 per cent is hard to beat safely elsewhere. Our mortgage overpayment calculator shows how even a modest regular overpayment shortens the term and cuts the total interest, often by more than people expect.

The 17 September announcement will make headlines, but for most households it changes very little on its own. What decides your payment is the rate on your own deal and when it ends. It is worth spending a few minutes on both before the Bank speaks, not after. For the wider picture, our look at why repossessions are still falling suggests most borrowers are, so far, weathering all this better than the headlines imply.

This is general information, not financial advice. The base rate and MPC vote are from the Bank of England; the 17 September 2026 meeting outcome is an expectation, not a certainty. Mortgage rate figures are indicative, from Uswitch in early September 2026, and your own rate depends on your loan-to-value, credit and lender. Calculations assume a repayment mortgage at a constant rate and exclude fees.