Eurostars eligibility looks simple on the surface: at least two independent participants, from at least two different Eurostars countries, led by an innovative SME. Managing consortium compliance across funding frameworks, I see this requirement satisfied on paper far more often than it's satisfied in substance — and reviewers are specifically trained to notice the difference.

"Independent" means more than "different company"

Two participants under common ownership, common control, or a pre-existing exclusive relationship that makes them function as a single entity can fail the independence test even if they're legally separate companies in different countries. This shows up most often between a parent company and its subsidiary, or between two firms founded by the same people with overlapping shareholding.

Fix: Check ownership and control structure against the independence criteria early — before the consortium is finalized, not while drafting the proposal.

A token cross-border role doesn't satisfy the spirit of the rule

The two-country requirement exists to fund genuine transnational collaboration, not a domestic project with a foreign name added to the partner list. A foreign partner assigned a thin, easily-separable task — a small dissemination role, a minor testing task with no real technical dependency on the rest of the project — reads as exactly that to a reviewer, even when it technically satisfies the letter of the eligibility rule.

Fix: Ask whether the project would need to be substantially redesigned if the foreign partner were removed. If the answer is no, the collaboration isn't load-bearing enough yet.

Each partner still answers to their own national funding rules

Eurostars is a joint programme, but funding is disbursed through each partner's national funding agency, and each agency applies its own eligibility and eligible-cost rules on top of the shared Eurostars framework. A consortium can be fully compliant with Eurostars' own criteria and still run into a rejection or funding gap because one partner's national agency has a stricter SME definition, a different eligible-cost list, or a lower funding cap than the others assumed.

Fix: Confirm each partner's eligibility and eligible costs directly with their own national funding agency before the budget is finalized — don't assume Eurostars-level eligibility is sufficient on its own.

Work distribution that quietly favors one country

Reviewers assessing implementation quality look at whether the budget and work package allocation across countries roughly matches the story the proposal tells about shared contribution. A consortium that describes balanced collaboration in its narrative but allocates the large majority of budget and technical work to a single country creates an inconsistency that's easy for a reviewer to spot and hard to explain away after the fact.

None of this requires a bigger consortium or a different partner. It requires being honest, early, about whether the collaboration you're proposing is the collaboration you're actually building — and fixing the gap before a reviewer finds it for you.