Why Do UK Commercial Mortgage Fixed Rates Not Follow the Bank of England Base Rate?

The Bank of England cuts rates, and a business owner with a fixed-rate commercial mortgage quote from last month checks back in, expecting the number to have improved. Often, it hasn’t moved at all. Sometimes it’s even gone up. This isn’t a lender being unresponsive to the news, it’s because fixed commercial mortgage pricing was never really tracking the base rate in the first place.

Bank of England held base rate at 4.25% in June 2026 - waiting for inflation to cool.

73% of UK SMEs expect to grow in the next 12 months - confidence remains strong.

What actually determines fixed commercial mortgage pricing?

Fixed-rate commercial mortgages are priced against SWAP rates, not the Bank of England base rate. A SWAP rate reflects what the financial markets expect interest rates to average over a specific future period, two, three, five years, matching the length of the fix being offered. It’s a forward-looking market measure, not a reflection of where rates sit today.

Why would a lender use a forward-looking measure instead of today’s base rate?

Because a fixed-rate mortgage locks the lender in for years, regardless of what happens to the base rate during that time. If a lender priced a five-year fix purely against today’s base rate, and rates then rose significantly over the following years, the lender would be stuck lending at a rate that no longer reflects their actual cost of funding. SWAP rates let lenders effectively lock in their own cost of funds for the same period as your fix, protecting themselves against exactly that risk, and pricing your mortgage around it.

So why doesn’t a base rate cut automatically bring fixed rates down?

Because the base rate and SWAP rates, while related, aren’t the same thing, and don’t always move together. SWAP rates reflect market expectations about the average rate environment over the coming years, not simply where the base rate happens to sit this month. If the market already expected a base rate cut, and had priced that expectation into SWAP rates weeks or months earlier, the actual cut, when it arrives, may cause little to no further movement in fixed pricing, the market had already anticipated it.

Can fixed rates move even when the base rate hasn’t changed at all?

Yes, and this is precisely why fixed commercial mortgage pricing can shift with seemingly no obvious trigger. SWAP rates respond to a broader set of signals, inflation data, economic forecasts, global market conditions, Bank of England commentary suggesting a future direction, all of which can move SWAP rates before an actual base rate decision is even made. The base rate is one data point among several that feed into where SWAP rates, and therefore fixed mortgage pricing, actually land.

Does this mean variable rates behave differently?

Yes, meaningfully. Variable and tracker commercial mortgage rates are typically priced as a margin over the Bank of England base rate directly, so when the base rate moves, variable pricing generally follows within the usual notice period. Fixed rates simply don’t work this way, they’re anchored to SWAP rates instead, which is exactly why fixed and variable pricing can seem to respond quite differently to the same Bank of England announcement.

Why does this distinction actually matter for borrowers?

Because assuming fixed commercial mortgage rates will automatically follow base rate cuts can lead to poorly timed decisions, delaying an application in the hope that a base rate cut will bring the quoted fixed rate down, when the market may have already priced that expectation in weeks earlier. Understanding that SWAP rates, not the base rate, drive fixed pricing helps set more realistic expectations about when, and why, rates actually move.

What should you actually watch, if not just the base rate?

Following the same signals that move SWAP rates, inflation data, Bank of England commentary about future intentions rather than just its current decisions, and general economic forecasts, gives a better sense of where fixed commercial mortgage pricing is heading than watching the base rate announcement alone. That said, trying to perfectly time an application around these movements is genuinely difficult, even for people who follow markets professionally, since SWAP rates can shift with very little warning.

Does this mean it’s pointless comparing fixed rates across lenders?

Not at all, if anything it makes comparison more important, since different lenders can be at different points in updating their pricing against the latest SWAP rate movements, meaning a rate quoted by one lender this week might already be more competitive, or less, than another lender who hasn’t yet repriced. A quote you’re happy with is generally worth locking in promptly, rather than assuming it’ll simply still be available, or improve, later.

The mistake borrowers often make

Some borrowers delay a commercial mortgage application specifically waiting for a base rate cut, assuming their fixed quote will automatically improve as a result. Because fixed pricing tracks SWAP rates rather than the base rate directly, that expectation is often already priced in before the cut is even announced, meaning the wait achieves nothing, and sometimes means missing a competitive rate that later moves in the opposite direction.

The bottom line

UK commercial mortgage fixed rates don’t follow the Bank of England base rate because they’re priced against SWAP rates instead, a forward-looking market measure reflecting where rates are expected to average over the length of the fix, not where the base rate sits today. This explains why fixed pricing can move with no obvious base rate trigger, and why base rate cuts don’t automatically bring fixed quotes down. Money Pilot’s experts can explain the SWAP versus base rate distinction in more depth, helping borrowers understand what’s actually driving their fixed-rate quote rather than watching the wrong number for signs of movement.