MITECO seal: requirements and how to obtain Calculo, Reduzco and Compenso

The MITECO carbon footprint registry seal certifies that an organisation calculates its emissions (Calculo), reduces them on a sustained basis (Reduzco) and offsets part or all of them with absorption projects registered in Spain (Compenso). It is granted when you register the footprint of a specific year and, for private companies, that registration is voluntary.

Two things are often confused here. Royal Decree 214/2025, of 18 March (BOE no. 89, of 12 April 2025, in force since 12 June 2025), requires certain companies to calculate their carbon footprint and to draw up and publish a reduction plan. It does not require them to enter the registry. Registering, and therefore displaying the seal, remains a voluntary decision in the private sector.

What is the MITECO carbon footprint registry?

The registry of carbon footprint, offsetting and CO₂ absorption projects is the public database run by Spain's Ministry for the Ecological Transition where organisations record their emissions and what they do about them. It was created under Royal Decree 163/2014 and is now governed by Royal Decree 214/2025.

It has three sections: carbon footprint and reduction commitments, CO₂ absorption projects, and offsetting of registered footprints. The seal shows which sections the organisation takes part in and the year it refers to, and comes in four combinations: Calculo; Calculo and Reduzco; Calculo and Compenso; and Calculo, Reduzco and Compenso.

Only organisational footprints attributable to Spanish territory are accepted, calculated over twelve consecutive months, usually the calendar year. In public procurement the seal can score points when the tender includes environmental criteria, but it does not do so automatically: it depends on what each tender actually asks for.

Is registration with MITECO mandatory?

Not for private companies. The table separates what Royal Decree 214/2025 makes mandatory from what remains voluntary.

The companies caught by the calculation duty are those already required to report non-financial information: more than 250 employees plus either public interest entity status or, for two consecutive years, total assets above 20 million euros or annual turnover above 40 million euros. Below those thresholds, calculating and registering are both voluntary.

What does each seal require?

The seal is annual and displays the year it refers to, so it has to be renewed by registering each financial year. The registered year stays published, but it stops reflecting the current position if the organisation drops out.

What paperwork does MITECO ask for?

A standard application to the carbon footprint and reduction commitments section includes:

• The application form signed by a legal representative.
• A footprint report with the organisational and operational boundaries, the twelve-month period, the activity data and the emission factors applied.
• The chosen activity ratio (for example tCO₂e per unit produced, per employee or per million euros of turnover) and its justification.
• The approved reduction plan, with a quantified target, a horizon of at least five years and the associated measures.
• The verification report from an accredited body, where this is mandatory.

MITECO maintains a support document for registration, updated in April 2026, and official calculators that set the accepted emission factors. Those factors are published around May of the year after the reporting year, which shapes the real timetable. There is no deadline: any year's footprint can be registered as long as the requirements are met.

When is third-party verification mandatory?

Verification by an accredited body, for example one accredited by ENAC, is mandatory in two cases:

• When the organisation is a large company, meaning it is not an SME or medium-sized group, nor an association, foundation or cooperative, nor part of a public administration.
• When it registers sources for which the registry publishes no emission factors, such as Scope 3 or process emissions, regardless of size.

There is a practical exception: organisations with EMAS or with a certified management system such as ISO 50001 can rely on that system's integrated verification if they only register Scope 1 and 2. Verification tied to the non-financial information statement does not replace the one the registry requires.

How to obtain the Calculo seal step by step

1. Set the boundaries. Fix the consolidation approach, the sites included and the twelve-month period. Usually one or two days if there is internal clarity.
2. Collect activity data. Electricity, fuels, refrigerant gases, fleet, travel. This is the slowest phase, one to two weeks depending on how scattered the sources are.
3. Calculate the emissions. Apply the registry factors to Scope 1 and 2 and pick an activity ratio you can keep stable over time.
4. Draft the reduction plan. Quantified target against the base year, five-year horizon, measures, owners and budget fit.
5. Verify if it applies. Commission external verification when it is mandatory and keep the report.
6. File the application. Upload the report, plan and annexes to the registry portal and answer any requests for correction.

If you want a first estimate before assembling the file, start with the carbon footprint calculator for companies and refine later with the official factors.

How do you obtain the Reduzco seal?

The test is arithmetic: the average emissions ratio of the last three registered years must be lower than the average of the immediately preceding three-year period. For 2025, for example, the 2023-2025 average is compared with the 2022-2024 average, which means four consecutive years of comparable data.

The ratio divides the footprint by an activity index, so a growing company can demonstrate reduction even if absolute emissions rise, provided intensity falls. For the comparison to hold you must keep the same organisational boundaries and the same methodology throughout, and apply comparability adjustments if you buy or sell a site.

How do you obtain the Compenso seal?

First you quantify how many tonnes you intend to offset, partially or fully. Then you acquire absorptions from projects registered in the registry's own absorption projects section and located in Spain: land use change, forestry, ecosystem restoration and conservation, and blue carbon projects. Finally you evidence that purchase in the registration application.

Credits from international voluntary markets do not count for this seal. Offsetting does not exempt you from reducing either: every registered footprint must come with its reduction plan. You can review what registering with MITECO actually delivers before deciding how far to go.

Common mistakes that delay registration

• Changing organisational boundaries from one year to the next without documenting the comparability adjustment, which breaks the series for Reduzco.
• Using emission factors other than the registry's without justifying why.
• Submitting a reduction plan with no quantified target or a horizon shorter than five years.
• Choosing an activity ratio whose definition shifts over time.
• Registering a period that is not twelve consecutive months.
• Forgetting external verification when it is mandatory by size or because Scope 3 is included.

There is more detail in our review of the five most common mistakes in MITECO carbon footprint certification.

Frequently asked questions about the MITECO seal

Is registration with MITECO mandatory?

Not for private companies, whatever their size. It is mandatory for ministerial departments of the General State Administration and the rest of the state administrative public sector, which must register their footprint annually from 2026 using 2025 data.

So what does Royal Decree 214/2025 actually require?

It requires companies that report non-financial information to calculate their Scope 1 and 2 footprint, to draw up a reduction plan with a quantified target and a minimum five-year horizon, and to publish both free of charge within six months of the end of the financial year. The reference year is 2025, published in 2026.

How long does the Reduzco seal take?

At least four years, because two overlapping three-year averages of the emissions ratio have to be compared. There is no shortcut: if you start registering in 2026, the first year you can qualify for Reduzco is 2029.

Are Verra or Gold Standard credits valid for Compenso?

No. Only absorptions from projects registered with MITECO and located in Spain count.

Do I need external verification if I am an SME?

Only if you register sources with no factors published by the registry, such as Scope 3 or process emissions. With Scope 1 and 2 and official factors, an SME can register without verification.

Can I register footprints from previous years?

Yes. The registry accepts any year as long as the requirements are met, so you can rebuild the historical series and reach Reduzco sooner.

If you want calculation, verification and registration in a single flow, Manglai's MITECO registry solution covers the three sections and keeps the audit trail a verifier will ask for. If you are still comparing tools, we have an analysis of the best software for MITECO certification.