Irish consumer prices were 4.1% higher in September than a year earlier, according to figures published by the Central Statistics Office on 8 October. The annual rate increased from 3.7% in August, while prices rose by 0.2% over the month.

For households heading into the heating season, the detail matters as much as the national headline. The broad housing, water, electricity, gas and other fuels division rose by 9.5% over the year. Education services increased by 8.9%, and transport by 7.5%.

The CSO links the housing division’s annual increase to heating oil, electricity, rents and mortgage interest. It attributes the transport increase to petrol, diesel and air fares. These are category averages, rather than a statement that every bill rose by the same amount.

Annual pressure and monthly movement

No spending division was cheaper than in September 2025. Yet some prices fell between August and September: recreation, sport and culture declined by 1.9% over the month. There is no contradiction. A price can fall from last month while remaining above last year’s level.

The index excluding energy and unprocessed food increased by 3.1% annually. That is a different measure from the overall 4.1% rate and should not be presented as a replacement for it.

Put your own spending beside the headline

A useful household check is to compare the same bill or purchase over comparable periods. Record the amount, the quantity and any change in tariff or product size. A higher energy bill can reflect both a changed unit price and changed consumption; the headline index cannot separate those effects for your home.

As a simple illustration, a basket that cost €100 and rose exactly in line with 4.1% inflation would cost €104.10. Your actual basket need not match that average. Use the figures to ask better questions about spending, rather than to assume a precise increase in your personal costs.

The September release concerns Ireland’s CPI. The separate European harmonised inflation measure has a different coverage, so check the label before comparing two inflation headlines.