Product Carbon Footprint for a Digital Product Passport: Eight Steps to a Verified Value

A product carbon footprint fit for a digital product passport is a verified number per declared unit, with its method, boundary and data sources stated. In October 2026 no ESPR product needs one yet, and the battery footprint in Article 7 of Regulation (EU) 2023/1542 is law but not yet applicable.

Buyers and tenders already ask for one, so build the calculation now and switch it on when your act lands. This guide is for the operator placing goods on the EU market: manufacturer, importer or brand. New to passports? Start with what a digital product passport is.

What is a product carbon footprint in a digital product passport?

A product carbon footprint is the sum of greenhouse gas emissions and removals in a product system, expressed as CO2 equivalents and based on a life cycle assessment that uses climate change as its only impact category (Regulation (EU) 2024/1781, the ESPR, Article 2(25)). A digital product passport carries the result per unit, with its metadata.

The passport holds the verified result; the full study stays behind it. The Commission's battery FAQ confirms that the supply chain data behind a footprint need not all go into the passport.

Does your product need a product carbon footprint in its passport yet?

Classify every product line, then do what the last column says.

No footprint is required when battery passports start on 18 February 2027, the Commission's FAQ confirms.

An ESPR act may require a product carbon footprint, sets the method and normally applies at least 18 months after entry into force (Articles 7(2)(b)(i), 8(d), 4(4)). Steel, indicated for 2026 (expected), comes first; its call for evidence says the impact assessment will consider carbon-footprint information, performance classes and minimum thresholds (ESPR working plan).

Start now or wait?

None of it is wasted: the same product carbon footprint inventory later answers tenders, CBAM requests and the passport.

Which method should your product carbon footprint follow?

EU law leans on the Product Environmental Footprint (PEF) method, Recommendation (EU) 2021/2279: the ESPR ties "environmental footprint" to it, and battery Annex II requires compliance with PEF and its Category Rules (PEFCRs, rulebooks per product category).

Decision rule (ours, not a legal hierarchy). Take the first that exists for your product:

1. A legal method: battery Annex II once adopted, or your ESPR act's method.
2. A valid PEFCR from the Commission's list; others are outdated or private. "Apparel and Footwear" is new; "Batteries and Accumulators" is in revision.
3. The general PEF method, climate change only.
4. ISO 14067:2018, if a customer requires it, with PEF-compatible choices on electricity, allocation and datasets.

Record the choice as a passport would show it: "PEF, Recommendation (EU) 2021/2279; no PEFCR; EF 3.1 datasets".

What are the eight steps, and who owns each?

A product carbon footprint is a team job. Name one owner per step before anyone collects a number.

If you do not manufacture, send the manufacturer your goal-and-scope page and the Step 4 request for the whole product, and require plant data and verification. It owns Steps 3 and 6; you own the field set and change log. See DPP for non-EU manufacturers.

Steps 1–2: How do you fix the declared unit and the boundary?

Write one page before you collect data. A verifier checks every later number against it, and a product carbon footprint without a unit cannot be compared.

Step 3: Which in-house data does a product carbon footprint need?

PEF's Data Needs Matrix sorts processes by your control. Situation 1: you run it. Situation 2: someone else does, but you can get company-specific data. Situation 3: neither. Situation 1 needs your own primary data, so a product carbon footprint inventory starts in your own systems.

Step 4: How do you get emissions data from suppliers?

Ask every situation-2 supplier the same questions in the same format. Free text cannot be verified, and mixed units break a product carbon footprint.

Request text to copy:

Subject: Carbon footprint data for [part number], reply by [date]

Please complete the attached template per part and plant for 2026, adding the CBAM emissions report summary and verification report for CBAM goods. If you cannot give a value by [date], say so and we will use a flagged dataset. Without a reply, [purchasing manager] follows up, and the next contract will carry a data clause.

Clauses and escalation: see collecting DPP data from suppliers.

For CBAM goods, also ask whether values are actual or default, and for the reporting period (2026 for 2026 imports; Implementing Regulation (EU) 2025/2547, Article 7). Operators write the report in English with a summary (Article 10) and may share only the summary (recital 17).

Are you a CBAM declarant? Above 50 tonnes of CBAM imports a year, all CBAM obligations apply (CBAM Article 2a), including a 2026 declaration due by 30 September 2027. You collect this data for it anyway, so reuse it.

What a CBAM value leaves out: anything beyond the producing installation and Annex I precursors from non-exempt third countries (Annex IV point 3). Iron, steel and aluminium count direct emissions only (Annex II), so primary aluminium lacks smelter electricity.

Cutting, welding and finishing of steel and aluminium products fall outside (Implementing Regulation (EU) 2025/2547, Annex II), transport never counts, and default values carry a mark-up (Annex IV point 4.1). For steel, the steel DPP guide builds a carbon bridge from the CBAM value.

Acceptance matrix: what each supplier reply does to your product carbon footprint.

Step 5: Which emission factors and databases can you use?

Secondary data fills situation 3 and every supplier gap in a product carbon footprint. Use EF-compliant datasets (secondary data built to PEF rules) via the Commission's Life Cycle Data Network: EF 3.1 now, EF 4.0 in 2028 (expected).

With no valid PEFCR and no EF-compliant dataset, July 2026 Commission guidance allows ILCD-EL datasets (International Reference Life Cycle Data System Entry Level, a lower tier), ideally from one database; otherwise omit the process and document it.

If non-EF-compliant data exceed 10% of the single overall score (PEF's weighted total of all impact categories), the study still counts as EF-compliant only with the Commission's disclaimer, word for word. A climate-only study has no single score: agree the test with your verifier.

Dataset register columns: process · dataset and database · version · EF-compliant, ILCD-EL or gap · share of result (for the 10% test).

Electricity is the input most open to argument, so PEF fixes an order:

Keep contract evidence even when you model the residual mix: ESPR recital 23 asks future methods to consider power purchase agreements, guarantees of origin and own generation.

Step 6: How do you split a shared plant's emissions?

Every product carbon footprint from a shared plant depends on how you split its energy. PEF's order: subdivide or expand the system (sub-meter the line); else allocate by a physical relationship (mass, coated area, machine hours); only then use another, such as economic value.

Electricity and transport rules take precedence, and a model made in two plants gets a production-weighted electricity mix.

Allocation memo: per shared input, the total, level, driver and values, result per unit, and why a higher level was impossible.

Step 7: Who verifies a product carbon footprint before it goes in the passport?

Under PEF, verification is mandatory once any part of the study is used externally, and a passport is external. Verify the value before it reaches a passport or customer document.

Where EU rules set their own verification, PEF says they prevail. Diarise expiry and surveillance with your passport updates.

Verification pack: goal-and-scope page, inventory with evidence, supplier replies with acceptance decisions, dataset register, electricity evidence, allocation memo, draft field set.

Step 8: How do you keep it current and show it in the passport?

Passport data must be "accurate, complete and up to date" (ESPR Article 9(1)), so a product carbon footprint needs an update routine. PEF requires an update if a communicated result worsens by more than 10%; battery law, a recalculation when the bill of materials or energy mix changes.

Recalculation triggers: bill of materials; energy mix or electricity contract; new plant, supplier or supplier country; packaging, logistics or technology; new dataset, PEFCR or method.

Change log columns: date · trigger · field · old → new value · re-verified · passport updated.

Recommended field set (in law, only the battery declaration contents of Article 7(1) are fixed, and they do not yet apply):

Supplier values, the inventory and the allocation memo stay in the product carbon footprint study. Offset-based claims of a neutral, reduced or positive greenhouse gas impact are banned under Directive (EU) 2024/825; see backing green claims.

Walkthrough: a hypothetical office-chair maker in Kaunas

Take a hypothetical office-chair maker in Kaunas: one plant, 42,000 Model A task chairs and 18,000 Model B visitor chairs a year, and a tender asking for a verified product carbon footprint per chair. Figures are illustrative.

1. Classify. Furniture has an ESPR act indicated for 2028 (expected), so this is buyer-driven. Model A bases need 130.2 t a year of imported aluminium profile (CN 7604), over 50 tonnes: the firm must be an authorised CBAM declarant and needs the extruder's verified data anyway.
2. Method and scope. General PEF method (no PEFCR), climate change only, EF 3.1; one packaged Model A chair, cradle-to-gate, 2026.
3. Inventory. Model A: a 2.6 kg aluminium base machined from 3.1 kg of profile, 3.4 kg of steel tube, 2.1 kg of PA6, 1.6 kg of foam, 0.5 kg of fabric, 1.9 kg of gas spring and mechanism. Model B: 2.2 kg of tube. Plant: 1,850 MWh of electricity, 2,400 MWh of gas.
4. Suppliers. Tube maker: verified PEF, accepted. Foam: unverified ISO 14067, accepted and flagged. PA6 moulder declines: EF-compliant dataset, re-ask on 31 March 2027. Extruder's summary pending: CBAM default, plus smelter electricity, finishing and transport from datasets.
5. Allocation. Tube cell (450 MWh) by steel processed; coating line (500 MWh electricity, 1,700 MWh gas) by coated area, 0.9 against 0.6 m²; assembly and building (900 and 700 MWh) by assembly minutes, 22 against 15. Model A carries 34.2 kWh of electricity and 44.4 kWh of gas per chair, Model B 22.9 and 29.8.
6. Electricity. A tariff sold as green, but no guarantees of origin cancelled for the plant: Lithuanian residual mix.
7. Verify and publish. A validation statement for three years at most, yearly surveillance. The value goes into the tender, and into a passport if the furniture act, once adopted, requires a footprint.

Model A's passport entry: "[X] kg CO2e per packaged chair · cradle-to-gate, by stage · PEF, no PEFCR, EF 3.1 · Kaunas plant [facility identifier], 2026 · [data quality] · verified, expires [date]".

Counterfactuals. Apply a per-tonne aluminium figure to the 2.6 kg base instead of the 3.1 kg of profile bought (109.2 t against 130.2 t), and that line of the product carbon footprint is 16% low; the mass balance fails.

Take the green tariff at face value, and 34.2 kWh of grid electricity per Model A chair vanishes until the verifier demands the residual mix. Split energy evenly, 30.8 kWh of electricity and 40.0 kWh of gas per chair, and Model A comes out about 10% low, Model B about 35% high.

When does a product carbon footprint need different inputs?

You hold an ISO 14067 study or an environmental product declaration (EPD). Reuse its inventory, supplier replies and allocation; re-check electricity, allocation and datasets against your stated method, then verify the new product carbon footprint.

Many variants of one model. Share one value only where bill of materials and processes match within your tolerance; document the rule.

A customer wants ISO 14067 or the GHG Protocol. Report a second, labelled result from the same inventory, never in the same passport field.

A supplier or country changes mid-year. It is a trigger: weight the year by volume, and re-verify if the result worsens by more than 10%.

Recycled and bio-based inputs. A company-specific recycled share (PEF's R1) needs supply-chain traceability; otherwise use the PEF Annex II default, or 0% where none exists. PEF reports biogenic emissions separately and gives no credit for carbon storage.

Batteries are stricter (see our battery carbon footprint guide):

• One value per model per plant, with plant-specific data for cell materials such as anode and cathode.
• The legal boundary also covers distribution and end of life; split by stage, as Article 7(1)(e) will require once it applies.
• The only draft method uses the national average electricity mix, without green tariffs, power purchase agreements or guarantees of origin.
• A battery remanufactured or repurposed after it was placed on the market is outside Article 7(1)–(3) (Article 7(5)): keep evidence of that date.

Which product carbon footprint rules could still change?

Settled, in law: the ESPR definitions, Article 7 and Annex I; battery Article 7 and Annex II; CBAM; Directive (EU) 2024/825; CPR Article 15. PEF is a non-binding Recommendation, but it is the reference that EU footprint law points to.

The product carbon footprint definition and passport slot are fixed, and EU law leans on PEF; dates and electricity rules are not. Keep method and electricity fields versioned.

How do you start a product carbon footprint in 90 days?

This week: classify every product line; check the PEFCR list and record your method; write the goal-and-scope page for your top seller.

This month: fill the data inventory; send the supplier request; check imports against the 50-tonne CBAM threshold; file electricity evidence or switch to the residual mix; write the allocation memo.

Within 90 days: run replies through the acceptance matrix; fill the dataset register; screen claims against Directive (EU) 2024/825; hand a verifier the verification pack; set triggers, a change log and the draft product carbon footprint field set.

Then test how a product links to its data with the free GS1 Digital Link QR generator: no signup, and it runs in your browser. Passmith also has a free plan.

Further reading: Battery carbon footprint · Digital product passport implementation · Collecting DPP data from suppliers · ESPR working plan

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