The CBAM 50-Tonne Exemption Explained

Last reviewed: 4 August 2026 · Author: Kadim Rammahi, Founder, AllMarketZones

The CBAM 50 tonne threshold is a single mass-based de minimis of 50 tonnes net mass per importer per calendar year, set by Article 2a(1) of Regulation (EU) 2023/956 together with point 1 of Annex VII, both inserted by Regulation (EU) 2025/2083 ("Omnibus I"). An importer whose Annex I goods stay at or below that mass in a calendar year is exempted from the obligations under the Regulation.

Article 2a(1) provides that the threshold "shall apply to the total net mass of goods under all CN codes aggregated per importer and per calendar year". The rule is mass-based and cumulative: it looks at the total net mass of imported CBAM goods across a whole calendar year, not the value or number of individual shipments.

This guide explains how the threshold is calculated, which goods count, and when crossing it triggers the requirement for authorised declarant status under the definitive regime, whose core obligations apply from 1 January 2026 (Article 36(2), point (b), Regulation (EU) 2023/956). AllMarketZones provides a fixed-fee CBAM Scope Assessment and does not provide authorised declarant representation or binding customs classification advice; where those are required, accredited partners are coordinated.

How the CBAM 50 tonne threshold is calculated

The threshold is the cumulative net mass of all Annex I CBAM goods a single importer brings into the EU customs territory across one calendar year (Article 2a(1), Regulation (EU) 2023/956). It is measured in net mass, assessed per importer, and aggregated across every CN code of goods within scope — which covers the listed iron and steel, aluminium, cement and fertiliser headings in Annex I.

The exemption does not apply to imports of electricity or hydrogen (Article 2a(4), Regulation (EU) 2023/956, as inserted by Omnibus I). Only goods actually listed in Annex I count towards the mass: goods outside Annex I — such as aluminium waste and scrap under CN 7602 — are outside the Regulation altogether (Article 2(1)) and add nothing to the total. Because the measure is cumulative, an importer can cross the threshold by combining modest quantities of several different CBAM goods, not only by importing 50 tonnes of a single product.

Do I need CBAM if I import under 50 tonnes?

An importer whose total net mass of Annex I goods does not cumulatively exceed 50 tonnes across the calendar year is exempted from the obligations under the Regulation for that year, and declares that exemption in the relevant customs declaration (Article 2a(1), Regulation (EU) 2023/956). Import mass records remain worth keeping, since the exemption depends on the cumulative total staying below the threshold.

Where an importer exceeds the threshold within the calendar year, it becomes subject to all obligations under the Regulation in respect of all emissions embedded in all goods imported in that calendar year (Article 2a(2)); and an importer that expects to exceed the threshold is required to submit the application for authorisation (Article 5(1b)). Our authorised CBAM declarant guide explains the application route through the CBAM registry.

What happens when you cross the threshold

An importer that exceeds the threshold becomes subject to all obligations under the Regulation for that calendar year (Article 2a(2)), and an importer expecting to exceed it is required to apply for authorisation as a CBAM declarant (Article 5(1) and (1b)). Failure to surrender the required certificates attracts a penalty identical to the excess emissions penalty under Article 16(3) of Directive 2003/87/EC — EUR 100 per tonne of CO2-equivalent, increased in accordance with Article 16(4) of that Directive — for each certificate not surrendered, and payment of the penalty does not release the declarant from the surrender obligation (Article 26(1) and (3), Regulation (EU) 2023/956). A person other than an authorised declarant who introduces goods without complying with the Regulation is liable to a penalty of three to five times that amount (Article 26(2)).

A company not established in an EU Member State cannot itself apply for declarant status: Article 5(1) reserves the application to importers established in a Member State, and where the importer is not so established, the indirect customs representative obtains the status instead (Article 5(2)). The obligations attach to whichever entity acts as the authorised declarant for the goods.

Do I need CBAM if I import under 50 tonnes across several commodities?

Obligations arise where the combined net mass of all Annex I goods across the year exceeds 50 tonnes, even where no single commodity reaches that figure on its own, because Article 2a(1) aggregates across all CN codes. Where the combined total stays at or below 50 tonnes for the whole calendar year, the exemption applies for that year.

Monitoring your position through the year

Because the threshold is measured across a full calendar year and the obligations bite once it is exceeded (Article 2a(2)), continuous tracking of cumulative net mass is the practical consequence of the rule — an importer that reaches 50 tonnes mid-year is already subject to the Regulation's obligations for that year's imports. Article 5(1b) additionally requires the application for authorisation from importers that expect to exceed the threshold.

Practical monitoring means recording the net mass of every Annex I import as it arrives, checking each CN code against the Annex I aluminium listings and the equivalent listings for other sectors, and forecasting whether planned volumes will breach the threshold. The current consolidated Regulation, including Annex I and Annex VII, is published on EUR-Lex, and the mechanism is documented on the European Commission CBAM pages; our CBAM pillar guide sets the threshold in the context of the wider mechanism.

How the threshold interacts with the declaration timeline

Exceeding the threshold in 2026 means the first annual CBAM declaration, covering 2026 imports, is due by 30 September 2027: Article 6(1) requires the declaration "by 30 September of each year, and for the first time in 2027 for the year 2026". Certificate sales on the common central platform begin when Article 20(1) becomes applicable on 1 February 2027 (Article 36(2), point (d)). The price of CBAM certificates corresponding to emissions declared for the year 2026 is calculated as the quarterly average of the closing prices of EU ETS allowances on the auction platform for the quarter of importation (Article 21(1a)); the weekly-average calculation in Article 21(1) is the general rule for later years.

For the sequence of dates in full, see our CBAM deadlines for 2026 and 2027 guide, which sets out each milestone in order.