Question to the HM Treasury:

To ask the Chancellor of the Exchequer, what estimate she has made of the relative additional costs to domestic refineries of not including refined products in the Carbon Border Adjustment Mechanism from January 2028 for the 2028-29 financial year.

The government recognises the role that refineries play in energy security and the UK’s industrial base. The Government published a call for evidence (https://www.gov.uk/government/calls-for-evidence/future-of-the-uk-downstream-oil-sector/future-of-the-uk-downstream-oil-sector-call-for-evidence) on the future of the fuel sector on 23^rd February 2026 in order to help understand the current state of the refining sector.

Following a strategic and technical assessment by HMG, it has been decided not to expand the Carbon Border Adjustment Mechanism (CBAM) to refined oil products in January 2028. We are continuing to work with the sector to assess the options and case for expanding CBAM to refined oil products at a later date.

We are unable to conclude that expanding the CBAM to refined oil products is technically feasible for January 2028, especially in an uncertain global environment where the potential adverse impacts of inclusion could not necessarily be managed effectively at such accelerated timelines.