How grant deadlines actually work

Not every "deadline" on a grant programme means the same thing, and the three shapes below cover most of what you will see on this site.

• A single, fixed deadline. One submission window, one close date; the call stops accepting proposals the moment it passes. Most Horizon Europe topics work this way — the EU Funding & Tenders Portal's own Online Manual describes it as "single-stage": for most topics you submit a full proposal by the call deadline, and a topic is "considered open until the deadline for submission has passed."
• Rolling, with cut-off dates. The call itself stays open for a long period (often the length of a whole funding programme) but has several intermediate cut-off dates that each trigger a batch evaluation. Per the same Online Manual: "the call has a final closure date... and several cut-off dates that trigger evaluation... After each cut-off date, the submitted proposals are grouped, reviewed and ranked together. If you miss a cut-off date, the proposal will be evaluated with the next batch." Missing one cut-off is not missing the programme — it just pushes you into the next batch, usually a matter of months.
• Continuously open, no deadline at all. Applications are accepted, and typically evaluated, on an ongoing basis with no fixed close date — this is what "rolling" or "always open" means on this site's own status badges. The Online Manual notes explicitly that the ability to re-edit a submitted proposal "is not available for continuously open calls," a small sign of how differently these are administered behind the scenes.

The practical rule: before you plan around a deadline, check whether the programme calls it a call deadline, a cut-off date, or neither — the three carry very different consequences for what happens if you are a day late.