UK inflation and government borrowing have risen more sharply than expected, putting additional pressure on Chancellor John Healey ahead of his first Autumn Budget on Wednesday, 28 October 2026.
Official figures released on 21 October reveal that consumer price inflation increased to 3.5% in September, up from 3.1% in August. The rise was driven largely by higher fuel costs, which have been affected by the continuing conflict involving Iran and disruption to global energy markets.
Meanwhile, government borrowing reached £24.5 billion in September, exceeding official forecasts by £1.9 billion.
Public sector debt also passed £3 trillion for the first time, although the figure remains provisional.
The figures present a difficult challenge for the government as it attempts to address the cost of living while maintaining control over public spending.
UK Inflation Climbs to 3.5% in September
According to the Office for National Statistics, the Consumer Prices Index increased by 3.5% in the 12 months to September 2026.
This was higher than the 3.1% recorded in August and exceeded economists’ expectations of approximately 3.4%.
It was also the highest annual inflation rate since October 2025.
The increase means that the prices of goods and services are rising faster than they were earlier in the year.
For households, the situation adds pressure to budgets already affected by expensive energy, food and transport.
Inflation does not mean every product has become pricier. Instead, it measures the overall rate of price changes across a representative basket of goods and services.
A rate of 3.5% means consumer prices were, on average, 3.5% higher than in September 2025.
Rising Fuel Prices Drive Inflation Higher
One of the main reasons for the latest inflation increase is the rising cost of petrol and diesel.
The conflict involving Iran has disrupted international energy markets, particularly oil and gas supplies passing through the Middle East.
These disruptions have increased costs for businesses and consumers.
According to the latest figures, motor fuel prices were approximately 30% higher than a year earlier.
Petrol prices increased by around 8.2 pence per litre during September, while diesel rose by approximately 10.7 pence per litre.
Higher fuel prices affect more than just motorists.
Transport companies, delivery services, farmers and manufacturers all rely on fuel.
When their costs increase, some businesses pass those expenses on to customers.
This can contribute to higher prices for food, clothing and other everyday products.
Government Borrowing Reaches £24.5 Billion
Alongside rising inflation, the government is facing higher borrowing costs.
ONS figures indicate that public sector net borrowing reached £24.5 billion in September 2026.
This was approximately £1.8 billion more than in September 2025.
It was also £1.9 billion higher than the Office for Budget Responsibility had forecast.
Government borrowing occurs when public spending exceeds revenue from taxes and other sources.
The government then borrows money to cover the difference.
Borrowing can help finance public services, infrastructure and other spending.
However, sustained deficits add to the national debt and create additional interest obligations.
The latest figures suggest that higher inflation is making those obligations pricier.
UK National Debt Passes £3 Trillion
Another significant development is that the UK public sector net debt has provisionally exceeded £3 trillion.
This is the first time the total has passed that threshold.
However, the headline figure does not tell the entire story.
The ONS estimates that public debt was approximately 94% of gross domestic product at the end of September.
That was slightly lower than the ratio recorded a year earlier.
GDP measures the total value of goods and services produced by the economy.
Comparing debt with GDP helps economists assess the size of government debt relative to the country’s economic capacity.
Although the debt-to-GDP ratio has declined, the absolute amount owed remains substantial.
The government must continue paying interest on that debt while funding public services.
Debt Interest Payments Reach Record September Level
The government paid £10.9 billion in debt interest during September.
This was the highest figure recorded for the month since comparable records began.
It was also £1.6 billion higher than in September 2025.
One reason is that some government bonds are linked to inflation.
When inflation rises, payments on those bonds can increase.
The ONS estimated that changes associated with inflation added approximately £4 billion to debt interest costs during September.
Higher interest payments create additional pressure on the public finances.
Money used to service debt cannot simultaneously be spent on other priorities without additional borrowing, taxation or spending adjustments.
This makes inflation an important issue not only for households but also for government budgeting.
Borrowing Is Lower Than Last Year but Above Forecast
There is an important distinction between the September figures and the wider financial-year trend.
During the first six months of the 2026–27 financial year, government borrowing totalled £97.8 billion.
That was £4.4 billion less than during the same period last year.
However, it was £6 billion above the Office for Budget Responsibility’s forecast.
This means borrowing has improved compared with the previous year but remains higher than the government had planned.
Economists generally examine longer periods rather than relying on a single month’s figures.
The timing of tax receipts, public spending and interest payments can affect monthly borrowing.
Nevertheless, the September figures demonstrate the pressure facing the Treasury ahead of the budget.
What Does This Mean for John Healey’s Budget?
Chancellor John Healey is scheduled to deliver his first budget on Wednesday, 28 October 2026.
The announcement comes at a time when the government faces competing economic priorities.
Households want relief from rising living costs.
Businesses are concerned about fuel prices, taxation and borrowing costs.
Public services continue to require funding.
Meanwhile, the government has committed to fiscal rules designed to control borrowing.
Healey must decide how to balance these pressures.
Potential budget measures under discussion include changes to taxation, business support and policies intended to reduce living expenses.
However, proposals reported before the budget should not be treated as confirmed government decisions.
The final measures will become clear when the Chancellor delivers his statement.
Could the Bank of England Raise Interest Rates?
The latest inflation figures have increased expectations that the Bank of England may raise interest rates.
The Bank’s inflation target is 2%, meaning the September reading of 3.5% is significantly above its objective.
Higher interest rates can help reduce inflation by making borrowing pricier and encouraging saving.
However, they can also increase costs for households and businesses.
The Bank of England’s benchmark interest rate currently stands at 3.75%.
Some economists expect policymakers to consider an increase to 4% at their November meeting.
This remains a forecast rather than a confirmed decision.
The Monetary Policy Committee will assess inflation, wages, economic growth and other indicators before deciding whether to change rates.
How Could Higher Interest Rates Affect Mortgages?
Mortgage borrowers could face additional pressure if interest rates rise.
People with tracker mortgages may see their monthly payments increase relatively quickly.
Those with fixed-rate mortgages would generally continue to pay the same amount.
However, they could face higher borrowing costs when their existing deals expire.
For first-time buyers, higher mortgage rates can reduce affordability.
Businesses may also face increased costs when taking out loans or refinancing existing debt.
On the other hand, savers may benefit if banks offer higher interest rates on savings accounts.
The overall impact depends on individual financial circumstances.
What Does Rising Inflation Mean for Families?
For ordinary households, the most significant concern is the continuing increase in everyday expenses.
Fuel prices have risen sharply, affecting commuting and travel expenses.
Higher transport expenses can also contribute to increased prices for delivered goods.
Energy costs remain another major concern, particularly as colder weather approaches.
Food inflation has been more contained than fuel inflation, but many families are still dealing with the cumulative effects of earlier price increases.
Even when inflation slows, prices do not necessarily fall.
They may simply rise more slowly.
This is why a higher inflation rate can be particularly difficult for households whose incomes are not increasing at the same pace.
How Could the Budget Help With the Cost of Living?
The government has several policy options available.
These include targeted financial support, changes to taxes and measures affecting household energy or transport costs.
However, every option involves trade-offs.
Reducing taxes may leave households with more disposable income but could also reduce government revenue.
Increasing public spending may provide additional support but could require higher borrowing or savings elsewhere.
Measures that increase overall demand can also affect inflation, depending on their design.
The Chancellor will therefore need to consider both immediate household pressures and longer-term fiscal sustainability.
The budget will also be accompanied by updated forecasts from the Office for Budget Responsibility.
These forecasts will provide a clearer picture of the government’s financial outlook.
Why Is the Iran Conflict Affecting the UK Economy?
The UK is connected to international energy markets even though it produces some oil and gas domestically.
When global energy prices rise, British businesses and consumers can be affected.
The conflict involving Iran has created disruption and uncertainty around important oil and gas shipping routes.
Higher international fuel prices can feed into British petrol, diesel and energy costs.
They can also increase production and transport expenses for businesses.
This creates a difficult economic situation because energy-driven inflation can rise even when domestic demand is relatively weak.
Higher inflation may then increase debt interest payments and complicate monetary policy decisions.
The situation illustrates how international conflicts can affect public finances and household budgets thousands of miles away.
What Happens Next?
The next major event is the Autumn Budget on 28 October.
Chancellor Healey will outline the government’s tax and spending plans.
The Office for Budget Responsibility will publish updated economic and fiscal forecasts.
Attention will then turn to the Bank of England’s interest rate decision in November.
Economists will also monitor future inflation releases to determine whether the September increase represents a temporary rise or a more persistent trend.
For households, the key questions concern the direction of fuel prices, energy bills, wages and borrowing costs.
For the government, the challenge is maintaining fiscal stability while responding to economic pressures.
Conclusion
UK inflation and government borrowing have increased at a difficult moment for the British economy.
Inflation reached 3.5% in September 2026, while government borrowing rose to £24.5 billion.
National debt also passed £3 trillion for the first time, although the debt-to-GDP ratio was lower than a year earlier.
Higher energy prices linked to international conflict have contributed to inflation and increased government debt interest payments.
These developments have added pressure on Chancellor John Healey ahead of the Autumn Budget.
The government must now balance support for households, public service funding and its commitment to controlling borrowing.
The Budget on 28 October will provide the next major indication of how ministers intend to address these challenges.
Frequently Asked Questions
What is the UK inflation rate in October 2026?
The latest published annual CPI inflation rate is 3.5%, covering the 12 months to September 2026.
Why has UK inflation increased?
Rising petrol and diesel prices, influenced by disruptions to global energy markets, were major contributors.
How much did the UK government borrow in September 2026?
Public sector net borrowing was £24.5 billion.
Has UK national debt reached £3 trillion?
Yes. The ONS provisionally estimates that the public sector net debt will exceed £3 trillion at the end of September 2026.
When is the next UK budget?
The Autumn Budget is scheduled for Wednesday, 28 October 2026.
Who is delivering the 2026 Autumn Budget?
Chancellor of the Exchequer John Healey.
Will the Bank of England raise interest rates?
Some economists expect an increase, but no decision has been announced. The Bank will assess economic conditions at its next policy meeting.
How does inflation affect mortgages?
Higher inflation can lead to higher interest rates, potentially increasing mortgage costs, particularly for tracker borrowers and those refinancing.
