Interreg is one of the most accessible EU funding programmes for regional authorities, universities, and public bodies — but it also has one of the most distinctive evaluation logics. The mistakes that sink proposals are rarely technical. They are structural.
Mistake 1: Treating Interreg as a research grant
Interreg is a regional development instrument, not a research programme. Evaluators assess proposals against Regional Policy objectives, not scientific excellence. Every activity in the project must connect to a measurable change in regional policy, practice, or capacity. If your work plan reads like a Horizon Europe proposal — lots of research, few policy outputs — it will score poorly.
Mistake 2: Partners from the same country dominating the budget
Interreg requires genuine transnational cooperation. Proposals where one country controls more than 50% of the budget are routinely flagged by evaluators as insufficiently transnational. Aim for a balanced budget split with no single country exceeding 40% of total eligible costs unless the call documentation explicitly allows it.
Mistake 3: Weak capitalisation plan
Every Interreg project must explain how its results will be absorbed into regional policy — this is called capitalisation. A common mistake is to describe capitalisation as a future intention (‘results will be shared with stakeholders’) rather than a concrete plan with named regional bodies, specific policy instruments, and committed adoption timelines. Write your capitalisation plan as if it will be audited.
Mistake 4: Ignoring the programme’s thematic concentration
Each Interreg strand (Europe, Baltic Sea, Alpine Space, etc.) has a defined set of thematic priorities for each funding period. Proposals that fall outside these priorities — or that try to address too many priorities at once — are penalised. Read the programme manual, not just the call text, and choose one priority area to dominate.
Mistake 5: Submitting without a lead partner mandate
The lead partner in an Interreg project carries legal and financial responsibility for the entire consortium. Many proposals arrive at evaluation with a lead partner that has not formally accepted this role — or worse, with a lead partner that lacks the administrative capacity to manage EU grant reporting. Confirm lead partner capacity in writing before submitting.
A note on timeline
Interreg applications take longer to prepare than most applicants expect. A competitive full application requires at minimum 12 weeks of active preparation, including two rounds of partner consultation on the work plan. If you are working to the 5th Call deadline of 30 May 2025, your consortium must be finalised by early March.