The European Commission’s definitive Carbon Border Adjustment Mechanism (CBAM) methodology for fertilisers places greater weight on nitrogen content and verified emissions when comparing costs between suppliers. Under the approach described for the sector, the functional unit is based on kilograms of nitrogen contained in the goods. This shifts attention away from conventional comparisons expressed only in euro per tonne.
Nitrogen-based functional unit affects supplier comparisons
The Commission’s CBAM methodology requires fertiliser buyers to assess goods using a nitrogen-based functional unit rather than relying solely on physical tonne pricing. The sector-specific basis for comparison is therefore tied to the nutrient content delivered by the product. As a result, carbon-cost outcomes can differ even when two fertilisers share similar euro-per-tonne prices.
The Commission’s latest Q&A also addresses how fertiliser products may be treated under Combined Nomenclature (CN) code aggregation rules. It states that production processes can aggregate certain CN codes where products use the same precursors or differ only in concentration. It further notes that ammonia, urea, ammonium nitrate and other fertiliser groups are subject to prescribed production-process rules.
For blended liquid fertilisers, the Commission indicates that weighted-average emissions calculations may be required. The implication is that embedded emissions assessed against the applicable CBAM functional unit can produce different carbon-cost profiles across products. Procurement teams are therefore directed toward evaluating carbon cost per usable unit of nutrient rather than focusing only on tonne price.
Natural gas continues to drive ammonia and nitrogen costs
Feedstock cost differences remain central to competitiveness in the fertiliser market, particularly for conventional ammonia and nitrogen products. Natural gas is described as the dominant cost driver for these inputs. Variations in gas efficiency, feedstock sources and production technologies contribute to differences in both production costs and emissions between plants.
CBAM introduces an additional link between import costs and embedded emissions for covered goods. This adds a carbon-related dimension to existing regional disparities driven by feedstock and production conditions. The mechanism therefore interacts with established cost drivers rather than replacing them.
Default values and verified emissions for fertilisers
The Commission’s default-value system applies a relatively low 1% mark-up for fertilisers compared with higher mark-ups for other CBAM goods. Even so, verified actual-emissions data can still be commercially valuable where a producer’s emissions are materially below the applicable default value. This creates a basis for comparing outcomes using either default values or verified figures.
For EU farmers and fertiliser distributors, CBAM is presented as not displacing commodity-market drivers of short-term pricing. Natural gas prices, seasonal demand, freight costs, sanctions and trade policy are identified as factors that can continue to dominate movements in the market. CBAM adds another factor that can favour lower-emission nitrogen production.
Data requirements for Southeast European producers
For producers and traders in Southeast Europe, the described opportunity is to convert plant efficiency into a verifiable carbon advantage at the nutrient level. Doing so depends on data systems capable of allocating emissions across prescribed production processes. The resulting values must be expressed using the functional unit required by CBAM.
The Commission’s framework also supports comparisons between products with different nitrogen concentrations and emissions profiles when reliable data are available. In this context, the benchmark extends beyond identifying the cheapest tonne of fertiliser alone. Buyers are expected to consider the cost of nitrogen content after accounting for the applicable carbon adjustment.