How to Prepare for CBAM Deadlines

Tracking CBAM reporting deadlines is critical for avoiding automatic penalty calculations. 2026 is the first year of the definitive regime, so the deadline structure is much thinner than older guides suggest: two statutory dates, one annual declaration, and no quarterly purchase checkpoints.

"The first CBAM declaration for the 2026 compliance year is due by 30 September 2027. Certificate purchases begin on 1 February 2027." — Regulation (EU) 2023/956, Article 20(1), as amended by (EU) 2025/2083

All dates and penalty amounts in this article are sourced from EU Regulation 2023/956, Regulation (EU) 2025/2083, IR (EU) 2023/1773 and the European Commission's official CBAM publications. Last verified: September 2026.

2026 CBAM Calendar — Definitive Regime

Scope note. 2026 is the first year of the definitive (financially binding) CBAM regime, not a transitional year. The transitional phase ran 1 October 2023 to 31 December 2025 and had a quarterly reporting rhythm. That rhythm does not apply to 2026 imports. Anything below describing quarterly CBAM certificate purchase checkpoints in 2026 describes a deadline that does not exist — certificate sales do not open until 1 February 2027.

The legally fixed dates for 2026 imports are few. Everything else on a compliance calendar is your own internal data discipline, not a statutory deadline:

Milestone	Date	Legal status
Import period covered	1 January – 31 December 2026	Statutory (Reg. 2023/956, Art. 2)
Embedded emissions price basis fixed	Quarterly average of EU ETS auctions, per 2026 quarter	Statutory (IR 2025/2621)
Certificate sales open	1 February 2027 on the common central platform	Statutory (Art. 20(1) as amended by Reg. (EU) 2025/2083)
Price basis switches to weekly average	From 1 February 2027	Statutory
Annual CBAM declaration due	30 September 2027	Statutory (Art. 20(1) as amended by Reg. (EU) 2025/2083)
Quarterly certificate holding begins	From 2027 — hold certificates equal to at least 50% of cumulative embedded emissions at each quarter end	Statutory
De minimis exemption	Below 50 tonnes of CBAM goods per year, aggregated across all covered goods	Statutory (Reg. (EU) 2025/2083)

There is no April 2026 certificate purchase deadline. You cannot be required to buy certificates before the platform that sells them is open, and it does not open until 1 February 2027.

Your quarterly data close is an internal practice, not a legal deadline

Most importers still close their books quarterly, because that is the rhythm their finance and customs systems already run on and because the 2026 price is fixed per quarter. Treat those internal cut-offs as what they are — a control you impose on yourself:

Internal practice	Suggested date	What it is
Q1 data close	31 March 2026	Internal only — no statutory consequence attaches
Q2 data close	30 June 2026	Internal only
Q3 data close	30 September 2026	Internal only
Q4 data close	31 December 2026	Internal only — this is the end of the import period

Each quarterly close locks the activity data and emission factors behind that quarter's declared emissions. Since the 2026 declaration is a single annual submission aggregating all four quarters, data quality is effectively decided by how you logged 2026 — not by how carefully you file in September 2027.

What Happens If You Miss a Deadline?

Situation	Consequence
Missed internal quarterly data close	No direct penalty — but the annual declaration inherits whatever gaps were left open
Missed 30 September 2027 declaration	Declaration considered non-compliant; triggers the penalty regime below
Failure to surrender certificates	€100 per tonne of CO₂e (minimum) — Regulation (EU) 2023/956, Article 26
Below the 50-tonne de minimis	Exempt from authorisation, declaration and certificates altogether (Reg. (EU) 2025/2083)
From 2027: quarterly certificate holding	Hold certificates equal to at least 50% of cumulative embedded emissions at each quarter end

The €10–€50 per tonne range that circulates in older CBAM material belongs to the transitional phase (IR (EU) 2023/1773, Article 16(1)–(3)). It applied to the 2023–2025 reporting years and is not the operative penalty for 2026 imports. If you are working from a guide that quotes €10–€50 for a 2026 obligation, it predates the definitive regime.

The surrender penalty is calculated on the total embedded emissions that should have been covered, not just the overdue portion.

What a Non-Compliant Year Actually Costs: A Real Example

Consider a steel importer who imports 5,000 tonnes of BF-BOF rebar from China over the year. At 2.236 tCO₂e/t (direct + indirect), that is 11,180 tCO₂e of embedded emissions. If no certificates are surrendered against that volume, at €100 per tonne the penalty exposure is on the order of €1.1 million — before the underlying certificate purchase itself, which at a €75.36 quarterly average would be roughly €843,000. For the same reason, setting calendar reminders is not optional administrative overhead: it is a financial protection measure worth six figures per year.

How to Never Miss a Deadline

Use a Compliance Calendar

Mark the three statutory dates — 1 February 2027 (sales open), 30 September 2027 (declaration due) — plus your four internal quarterly data closes. Set internal deadlines at least two weeks before each quarterly close.

Set Automated Reminders

Configure email or calendar reminders at three critical points:

• 30 days before your quarterly close — Start data collection
• 15 days before your quarterly close — Generate draft dataset
• 7 days before your quarterly close — Final review and lock the period

Prepare Data in Advance

Product import data is available from customs declarations as soon as goods clear. Close each quarter before the period ends, not after — the September 2027 declaration aggregates all four quarters, so a gap opened in March cannot be repaired in August.

CbamTrack's built-in compliance calendar tracks all CBAM deadlines with automatic email reminders and iCal export for integration with your existing calendar system.

Deadline Planning Tips

1. Start early — Begin data collection 4–6 weeks before each quarterly close
2. Use default factors if needed — Don't delay the declaration waiting for supplier data
3. File on time — You can amend a declaration within two months after submission
4. Document everything — Keep records of all data sources and calculations
5. Review across quarters — Compare each quarter against previous ones to spot anomalies

FAQ

When is the CBAM deadline?

Under the definitive CBAM regime (2026+), the annual declaration is due by 30 September of the year following the import period. The first declaration covering 2026 imports is due 30 September 2027. There are no quarterly certificate purchase checkpoints in 2026 — certificate sales open on 1 February 2027, so there is nothing to purchase during the import year itself. Price basis is a quarterly average of EU ETS auctions through 2026 and moves to a weekly average from 1 February 2027.

What happens if I miss a CBAM deadline?

Failure to surrender certificates attracts a penalty of €100 per tonne of CO₂e as a minimum under Regulation (EU) 2023/956, Article 26, calculated on the total embedded emissions that should have been covered. Missing the 30 September 2027 declaration makes it non-compliant and triggers that regime. The €10–€50 per tonne range found in older material belongs to the transitional phase (IR (EU) 2023/1773, Article 16(1)–(3)) and applied to 2023–2025, not to 2026 imports. There is no extension mechanism.

What if the deadline falls on a weekend? Submit on the next business day. However, it is safer to submit before the weekend.

Can I get an extension? Extensions are not granted under current CBAM regulations. Plan ahead.

Are the deadlines the same for all EU countries? Yes. CBAM deadlines are set by EU regulation and are uniform across all member states.

Do I need to submit if I had no imports at all in 2026? If you have no CBAM goods above the 50-tonne de minimis threshold, you are exempt from authorisation, declaration and certificates entirely. If you are above the threshold, a nil declaration is still required — failing to file one can trigger penalties.

Sources

• EU Regulation 2023/956 — CBAM main regulation (Art. 26 penalties; Art. 20(1) as amended)
• Regulation (EU) 2025/2083 — Omnibus: 50-tonne de minimis, declaration and sales dates
• IR (EU) 2023/1773 — Transitional-phase penalties, cited above only to distinguish them from the definitive regime
• European Commission CBAM page

Last updated: September 2026 | Sources: EU Regulation 2023/956, Regulation (EU) 2025/2083, IR (EU) 2023/1773, European Commission CBAM publications

Never Miss a Deadline Again

CbamTrack's compliance calendar sends automated reminders before each internal quarterly close and tracks submission status, maintaining a complete history of all your CBAM reports. Download our free CBAM reporting template to organise your data, compare alternatives, or try CbamTrack free.