Consumer prices climbed to a three-and-a-half per cent rate in the year ending September, marking the fastest pace of growth recorded since October last year.
Fuel costs were a primary driver of this acceleration, with petrol and diesel prices hitting levels not seen since August 2022.
The Office for National Statistics confirmed that inflation rose from 3.1 per cent in the previous month to reach the new peak.
Simultaneously, the UK government's borrowing activity jumped significantly, with £24.5bn taken on during September compared to the same period a year prior.
This monthly increase pushed total debt for the financial year to date £6bn higher than the projections set by the Office for Budget Responsibility.
The overshoot in borrowing was largely attributed to rising interest charges driven by the uptick in inflation rates.
These figures will directly influence benefit adjustments scheduled for next April, as statutory payments must align with the September consumer price index data.
Personal independence payment and carer's allowance are among the benefits legally required to rise in line with this latest inflation measure.
Prime Minister Keir Starmer has indicated that the upcoming Budget will adhere to Labour's pledge against increasing income tax, National Insurance and VAT.
The administration aims to balance these fiscal pressures while maintaining adherence to established economic rules.
With the next week's Budget approaching, officials are monitoring how these combined economic shifts impact long-term stability.
The Office for National Statistics continues to publish monthly data that guides both household budgets and national policy decisions.