TRL Levels Explained: What Each Technology Readiness Level Means for EU Grants

TRL levels are a nine-step scale that measures how mature a technology is, from TRL 1 (basic principles observed) to TRL 9 (actual system proven in an operational environment). EU and German funders use the scale to decide which programme you can apply to and which of your costs a grant will pay for.

A wrong claim can cost you anything from a weaker score to an ineligible proposal. This guide gives you the official EU wording for each level and the TRL each major programme expects in 2026. It also covers the German twist: most national grants set their rate by research category, not by TRL.

What is a technology readiness level?

A technology readiness level (TRL) is a score from 1 to 9 that shows how far a technology has progressed, from an observed scientific effect to a system proven in real use. The European Commission uses the score to summarise how close a project is to real-world use.

NASA developed the scale in the late 1970s to assess space technologies. It began with seven levels and grew to nine levels in the 1990s, according to the European Commission's 2025 report on TRL in Horizon Europe. The EU first wrote TRLs into the regulation establishing Horizon 2020, and Horizon Europe has used them ever since.

Calls for early lab research and calls for market pilots sit side by side on the same EU portal. Your TRL tells you which ones are yours.

What do the nine TRL levels mean?

The European Commission defines the nine TRL levels in the General Annexes of the Horizon Europe Work Programme 2026 to 2027. TRL 1 to 4 run from basic principles to lab validation, and TRL 5 to 9 run from a relevant environment to a system proven in operation. They apply to any call that asks for a TRL, unless the call says otherwise.

Quote the EU wording in your proposal. Other versions, such as NASA's TRL definitions, use different phrasing.

TRL 1 to 4: the research stage

TRL 5 to 9: the development and deployment stage

Source: Horizon Europe Work Programme 2026 to 2027, General Annexes (PDF), European Commission Decision C(2025) 8493 of 11 December 2025.

Two word pairs cause most of the confusion. At TRL 5 the technology is validated, at TRL 6 it is demonstrated, both in a relevant environment that approximates real use. An operational environment, used at TRL 7 and TRL 9, is the real setting itself. For key enabling technologies the bar rises: TRL 5 and 6 require an industrially relevant environment, and TRL 9 means competitive manufacturing.

TRL in Horizon Europe: which levels does each action fund?

Horizon Europe has no single TRL for the whole programme. Each call topic states the TRL it expects, and the type of action gives you the rough range. Under Recital 38 of the Horizon Europe Regulation, grants fund work up to and including TRL 8.

Source: Horizon Europe General Annexes 2026 to 2027 (PDF, linked above). Both action types add a 25 percent flat rate for indirect costs.

In practice, RIA topics sit lower on the TRL scale and IA topics higher. Knowing the Horizon Europe structure of pillars and clusters helps, because the TRL expectation follows from where a topic sits.

In the European Commission's 2025 analysis of 2,462 Horizon Europe projects, 63 percent started at TRL 3 or lower, while 47 percent finished at TRL 6 to 8 or expected to. In the same analysis, most projects moved two steps (39 percent) or three steps (30 percent), in line with what project officers expect over a typical 36 to 48 months. A plan that takes a technology from TRL 3 to TRL 8 in three years promises far more than that. Evaluators notice.

Our Horizon Europe funding consulting starts by checking that your topic and your TRL match.

What TRL do you need for EIC Pathfinder, Transition and Accelerator?

The European Innovation Council (EIC) ties each of its three main schemes to a TRL band. Pathfinder funds early research at TRL 1 to 4. Transition matures results from TRL 3 completed or TRL 4 towards TRL 5 or 6. The EIC Accelerator grant funds activities from TRL 6 to TRL 8.

Source: EIC Work Programme 2026, main elements (PDF), checked 23 September 2026.

Demand for Pathfinder is high: the EIC received 2,103 proposals for Pathfinder Open 2026.

EIC Transition has the strictest TRL gate. Your proposal must build on results from an eligible EU project, such as EIC Pathfinder, an ERC Proof of Concept or a Pillar II RIA, at TRL 3 completed or TRL 4. Any other starting TRL makes it ineligible. In the round announced in February 2026, the EIC selected 40 projects from 611 submissions.

For the EIC Accelerator, the EIC's programme page puts the grant component below EUR 2.5 million for TRL 6 to 8 work, completed within 24 months. The last 2026 cut-off for full proposals is 4 November.

The EIC's tips for applicants add the hard part. You must show that the innovation has reached at least TRL 6, meaning TRL 5 is completed. The Commission may recommend a smaller grant if your plan includes activities above TRL 8, so that work belongs in the equity request or your own budget.

Here is what the Accelerator's finishing and validation stage looks like in practice. An anonymised medtech company had a diagnostic device built on sensor fusion and signal processing. Before any revenue, it still had to finish a clinical-grade design and run the bench tests that would validate it. Be-Funded took the application through the three-stage EIC Accelerator process, and the resulting EUR 2.4 million grant pays for that finishing and validation work. The company can seek EIC Fund equity for the scale-up. Read the full medtech EIC Accelerator funding case study.

Because the grant stops at TRL 8, the TRL question shapes the whole application. Our EIC Accelerator funding consulting starts there. We map your work packages against the official TRL definitions and move anything above TRL 8 into the equity or own-funds part of the plan. We also assemble the evidence evaluators expect behind a TRL 6 claim, then write the short proposal and the full application and prepare your team for the jury interview. The fee is success-based, so you pay only once funding is secured.

If your TRL points away from the EIC, our overview of EU funding programmes for companies compares the alternatives.

How do German funding programmes use TRL?

German federal programmes use TRL less consistently than the EU. Some 2026 calls write a TRL band into the rules, such as TRL 3 to 7 for KMU-innovativ Mat2KMU and up to TRL 8 for Digital-Tech-to-Product. The Forschungszulage, Germany's research allowance, ignores TRL entirely.

The Bundesministerium für Forschung, Technologie und Raumfahrt (BMFTR), the federal research ministry, set the Mat2KMU band in an amendment of 29 April 2026. The Bundesministerium für Digitales und Staatsmodernisierung (BMDS), the federal digital ministry, opened Digital-Tech-to-Product on 16 September 2026.

Sources: BMFTR and BMDS call texts, checked 23 September 2026.

The Forschungszulage has no TRL test. Section 2 of the Forschungszulagengesetz (FZulG) asks only whether a project falls into fundamental research, industrial research or experimental development.

Why does the research category matter more than TRL for German grant rates?

German R&D project grants set the aid rate by research category under the EU General Block Exemption Regulation (GBER, in German the Allgemeine Gruppenfreistellungsverordnung or AGVO), not by TRL. In practice, a higher TRL can therefore lower your funding rate.

The GBER's definitions of industrial research and experimental development explain why. Industrial research can include prototypes built in a lab or in an environment with simulated interfaces. Experimental development covers prototyping, demonstrating and piloting in environments representative of real-life operating conditions. Set next to the TRL definitions, a rough pattern appears.

Indicative mapping by Be-Funded. The category is assessed per task, not per TRL. Bonuses under Article 25(6) GBER can raise industrial research and experimental development rates to a maximum of 80 percent.

Do not read the table as a timeline. Recital 47 of the GBER says the categories need not follow a chronological order, so a late task can still count as industrial research.

The BMDS call shows the effect in money. It targets TRL 6 to 8, yet funds experimental development at up to 25 percent and industrial research at up to 50 percent of eligible costs, before any bonus. The same work package can earn twice the rate, depending on its category.

How do evaluators check your TRL claim?

Evaluators check a TRL claim mostly against the evidence in your proposal. The TRL is self-declared, and the European Commission admits that reviewers have limited tools to verify it.

Paola Trucco, Jasper van Lopik and Leonardo Zanobetti, the authors of the Commission's 2025 TRL report, write that "there is no specific guidance material available aside from the TRL scale". In the survey behind the Commission's 2025 report, 89 percent of Horizon Europe project officers said beneficiaries risk over- or underestimating their TRL.

A wrong claim does not cost the same everywhere.

Check your claim against the rules that actually exist:

• State the TRL at the start and the target TRL at the end, in the General Annexes wording.
• Benchmark your technology against the international state of the art, as the Mat2KMU call requires.
• For the EIC Accelerator, keep grant-funded work inside TRL 6 to 8 and budget anything beyond it from equity or your own funds.
• For EIC Transition, name the eligible EU project behind your results and show they reached TRL 3 completed or TRL 4.
• Plan for two or three TRL steps unless you can justify more.

This article summarises funding rules as published on 23 September 2026 and is not legal, tax or financial advice. Check the current call text before you apply.