Question to the HM Treasury:

To ask His Majesty's Government what assessment they have made of the impact of taxing imported fertilizer but not imported food on ensuring that British farming remains globally competitive.

Overall, the Government does not expect the introduction of the UK Carbon Border Adjustment Mechanism (CBAM) on fertiliser to have a significant impact on UK farmers.

The UK’s core tariff schedule, known as the UK Global Tariff (UKGT), sets out the tariff rates that apply to all imported goods balancing the interests of UK consumers, producers, productivity, competitiveness and external trade. A large proportion of agri-food and fertiliser imports enter the UK tariff free. This is either because the tariff applied on the specific product under the UK Global Tariff schedule is zero or because the product is eligible for a zero-duty preferential tariff when imported from countries with which the UK has signed a bilateral trade deal.

Additionally, the UK operates an Emissions Trading Scheme (ETS). This is the UK’s principal carbon pricing mechanism and covers the manufacturing of fertiliser. In recent years, UK-based fertiliser manufacturers have received more free allowances than they needed to surrender to cover their emissions.

The UK CBAM rate charged on imports, including fertiliser, will reflect the carbon price paid by domestic industries after support mechanisms (such as free allowances) have been taken into account. As a result, we expect initial liabilities arising from the UK CBAM to be relatively low whilst encouraging the supply and use of fertiliser with lower levels of embodied carbon than would otherwise have been the case.

More generally, about 70% of UK agri-food imports come from the EU. The EU also have an Emissions Trading Scheme and will introduce a CBAM from January 2026; both of which include fertiliser. This means that fertiliser used by EU farmers will also have been subject to a carbon price. At the same time, many non-EU food imports cannot be produced in the UK.