UK inflation rose faster than expected in September, adding pressure on households and increasing expectations that the Bank of England could raise interest rates at its next meeting. The figures were published shortly before the UK government’s autumn budget and alongside new data showing public sector debt had passed £3 trillion.
The Office for National Statistics (ONS) said annual consumer price inflation reached 3.5% in September 2026, up from 3.1% in August. It was the highest annual rate recorded since October 2025.
Fuel prices drive the latest rise in UK inflation
Transport costs made the largest contribution to the monthly increase in inflation. Transport prices rose 6.6% over the year, compared with 4.6% in August, as petrol and diesel became more expensive.
Average diesel prices in September were at their highest level since July 2022. The source report attributed the sharp increase in fuel costs to disruption linked to the US-Iran war, which pushed up global energy prices.
Other parts of the economy also recorded increases:
- Annual services inflation accelerated to 3.7%.
- Housing and household services costs rose 5.3% year-on-year.
- Communication costs increased 5.8%.
- Food inflation remained unchanged at 1.3%.
- Core CPI inflation rose from 2.6% to 2.8%.
Compared with August, consumer prices increased by 0.4% in September, following a monthly rise of 0.5% the previous month.
Why the figures matter for the Bank of England
The inflation data have strengthened expectations that the Bank of England may increase its benchmark interest rate at its meeting on 5 November. If that happens, it would be the first rate increase by the UK central bank since 2023.
The Bank of England’s current benchmark rate is 3.75%, while its inflation target is 2%. A higher-than-expected inflation reading makes it more difficult for policymakers to conclude that price pressures are under control, particularly when services and transport costs are also rising.
Market expectations for a November increase were described as approaching 100% in the source report. There was also an expectation of more than a 50% chance of a second increase before the end of 2026. These are market forecasts, however, rather than a confirmed decision by the Bank of England.
Higher interest rates can increase borrowing costs for households and companies, although the effect on mortgages and other loans depends on the product, lender and timing. The Bank of England does not directly set retail mortgage rates.
Households face pressure from energy and services
The inflation figures arrive as households face continued pressure from energy, transport and everyday services. The energy price cap increased slightly in October, while expectations of a larger rise early next year could further affect consumer confidence.
Rising business costs may also feed into prices. Businesses are facing higher costs for raw materials and transport, which can affect the prices paid by consumers. Whether those costs are passed on depends on the sector and the strength of demand.
The combination of higher fuel prices and rising services inflation is important because it suggests that inflationary pressure is not limited to one category. Food inflation was stable, but transport, housing-related services and communications all recorded stronger annual increases.
UK borrowing rises before the autumn budget
Separate ONS figures showed that UK public sector net borrowing reached £24.5 billion in September 2026. That was £1.8 billion higher than in the same month a year earlier and above market expectations.
The ONS said spending, including higher debt-interest costs, increased more than government income. Higher interest rates and elevated bond yields can make it more expensive for governments to service existing debt and finance new borrowing.
Borrowing between April and September 2026 totalled £97.8 billion, equivalent to 3.1% of gross domestic product. Although the figure was slightly below the same period last year, it was £6 billion above the Office for Budget Responsibility’s forecast.
UK public sector net debt was provisionally estimated to have exceeded £3 trillion for the first time at the end of September. As a share of the economy, however, debt stood at 94% of GDP, down from 94.7% a year earlier.
What the figures mean for the UK budget
The inflation and borrowing data were released one week before the Labour government’s autumn budget on 28 October. The budget is expected to address cost-of-living pressures while also accounting for the increased cost of public borrowing.
Higher inflation can make government spending more expensive, while higher interest rates may increase debt-servicing costs. At the same time, measures designed to support households could have implications for the government’s fiscal position. The balance between household assistance, public finances and inflation control will be closely watched.
What happens next?
The next major decision will come from the Bank of England’s Monetary Policy Committee on 5 November. Policymakers will consider the September inflation figures alongside newer information on wages, economic activity, energy prices and inflation expectations.
The autumn budget on 28 October will provide a separate test for the UK economy. Its measures could influence household finances, government borrowing and the outlook for demand.
For households and businesses, the immediate takeaway is that inflation remains above the Bank of England’s target and that fuel and service costs are contributing significantly to price pressures. The figures also show why interest-rate expectations and public-finance concerns are becoming increasingly connected.
UK inflation has risen to 3.5%, driven chiefly by fuel and transport costs, while government borrowing and debt have reached important thresholds. The Bank of England’s November meeting and the autumn budget will determine whether policymakers respond with higher rates and how the government addresses the pressure on households and public finances.