Le rapport est dû.
Here's how you can express it with more context:
* Le rapport est dû [date]. (The report is due [date].)
* Le rapport est à rendre [date]. (The report is to be submitted [date].)
* La date limite de rendu du rapport est [date]. (The deadline for submitting the report is [date].)
You can also use the verb "devoir" (to have to, to be due) in a sentence like:
* Le rapport doit être rendu [date]. (The report has to be submitted [date].)
* Vous devez rendre le rapport [date]. (You have to submit the report [date].)