The basket of prices increased by 4.5% in the past 12 months, a rate last experienced between June 2023 and June 2024.
The RPIX figure – which includes mortgage payments – hit 4.6% at the end of September, compared to 3.3% 12 months earlier.
The quarter three inflation bulletin was released by the States on Tuesday, a few days after Jersey announced a significantly lower annual inflation rate of 3%.
The latest acceleration in prices in Guernsey will increase calls on deputies to avoid heaping further pressure on the island’s cost of living during their 2027 Budget debate next week.
More detailed figures intended to show the impact of price rises on different types of household revealed that those with at least one retired person experienced the highest inflation rate over the past 12 months. Their staple goods and services rose by 6.7%, driven by a massive jump of more than 16% in heating costs.
Low-income households had a 5.2% inflation rate, compared to 4.2% for high earners. It was the sixth consecutive quarter in which the burden of price rises fell more heavily on less affluent households than the rest of the population.
There was some relief for consumers in the third quarter of the year as food prices fell 0.3%, mostly because of special offers, although food was still up 2.7% year-on-year. Fares were down 2.6% over the year.
Housing added 1.1 percentage points to annual inflation, the biggest contributor of any category.
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