UK inflation accelerated to 3.5% in September 2026 from 3.1% in August, driven chiefly by rising petrol and diesel prices. The figures, released on October 21, came alongside higher government borrowing, adding pressure on Chancellor John Healey a week before his October 28 Budget.
Key Takeaways
- Annual consumer price inflation reached its highest rate since October 2025.
- Motor fuel prices rose 29.8% over the year to September, leading the inflation increase.
- Government borrowing reached £24.5 billion in September, leaving the financial-year total £6 billion above forecast.
Table of Contents
- UK inflation accelerates as fuel prices climb
- Price pressure extends beyond the petrol pump
- Borrowing adds to the Budget challenge
- September figures shape April benefit increases
- Conclusion
UK inflation accelerates as fuel prices climb
The Office for National Statistics’ September 2026 consumer price inflation bulletin showed prices rising 0.4% over the month. Transport, particularly motor fuels, made the largest upward contribution to the increase in the annual inflation rate, partly offset by restaurants and hotels.
Petrol became 8.2 pence per litre more expensive between August and September, reaching its highest price since August 2022. Diesel rose by 10.7 pence per litre to its highest level since July 2022.
The annual motor-fuel inflation rate rose from 23.0% in August. That distinction matters: the 29.8% increase measures the change over a year, not the rise at the pumps in a single month.
| Item | Details |
|---|---|
| Average petrol price | 169.5 pence per litre in September 2026. |
| Average diesel price | 192.5 pence per litre in September 2026. |
| CPI including owner occupiers’ housing costs | Annual CPIH inflation rose to 3.6% from 3.3% in August. |
| CPI services inflation | Annual rate increased to 3.7% from 3.4% in August. |
Price pressure extends beyond the petrol pump
Core CPI, which excludes energy, food, alcohol and tobacco, increased to 2.8% from 2.6% in August. Fuel therefore dominated the headline acceleration, but the underlying measure also strengthened.
Airfares, computer games and live events contributed to the increase in inflation. Airfares illustrate how annual comparisons can move differently from monthly prices: fares fell 19.5% between August and September, but that was a smaller seasonal decline than the 28.8% fall a year earlier.
Food and non-alcoholic beverage inflation remained at 1.3%, unchanged for a third consecutive month, offering a contrast to the sharp increases in motor fuel costs.
Borrowing adds to the Budget challenge
The government borrowed £24.5 billion in September, £1.8 billion more than a year earlier, as higher inflation helped push up debt interest costs. Borrowing for the financial year to date was £6 billion above the Office for Budget Responsibility’s forecast.
Overall government debt exceeded £3 trillion for the first time, although debt as a proportion of economic output fell. The cash total and the debt-to-output ratio can move in different directions; the latter is the measure used to assess compliance with the government’s fiscal rules.
Healey has promised to maintain Labour’s commitment not to raise income tax, National Insurance or VAT while keeping to its fiscal rules. Those remain commitments ahead of the Budget, rather than measures already announced in it.
September figures shape April benefit increases
September’s CPI reading also determines the inflation-linked increase for benefits including personal independence payment and carer’s allowance in April 2027.
The state pension is likely to rise by 3.9% under the triple lock, matching average wage growth for May to July rather than September’s lower inflation rate. That remains an expected increase, not a confirmed pension award.
Conclusion
The October 28 Budget is the next confirmed test of how the government will balance its tax commitments with higher borrowing and renewed price pressure. The ONS is scheduled to publish the next consumer inflation release on November 18, 2026.
Read More News
Disclaimer
This FinanceVelix article provides general information, not personalized financial, investment, legal, or tax advice. Market prices, interest rates and economic conditions can change; investments carry a risk of loss. Facts reflect the material available when published and may change. Check important information independently and consult a qualified professional when needed. Mentioning an asset, company, or service is not an endorsement.
