die Abgabe
submission
The submitting or handing in of something, for example an assignment, a document, or an application.
Der Termin für die Abgabe der Steuererklärung ist der 31. Juli.
The deadline for submitting the tax return is July 31.

submission / fee
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submission
The submitting or handing in of something, for example an assignment, a document, or an application.
Der Termin für die Abgabe der Steuererklärung ist der 31. Juli.
The deadline for submitting the tax return is July 31.

'Die Abgabe' (submission/fee) is the noun form of the separable verb 'abgeben' (to hand in/give away). The prefix 'ab-' here has the meaning of 'away' or 'onward', so it refers to giving something away or passing it on.
Ich muss meine Schlüssel an der Rezeption abgeben.
I have to hand in my keys at the reception desk.
The meaning is easy to infer from the context: if it is about a deadline, it means submission (m01). If it is about money for the state, it means taxes or fees (m02). If it is about sports, it means a pass (m04).
Die Abgabe der Projektarbeit ist nächste Woche.
The submission of the project paper is next week.
In the context of school, university, or work, 'Abgabe' (submission) is often combined with words for deadlines. Important compounds are 'der Abgabetermin' (submission date/deadline) and 'die Abgabefrist' (submission deadline).
Bitte halten Sie die Abgabefrist für das Dokument ein.
Please meet the submission deadline for the document.
When it is about money for the state, the plural 'die Abgaben' (taxes/fees/contributions) is often used. A very common fixed expression is 'Steuern und Abgaben' (taxes and contributions).
Jeder Arbeitnehmer muss Steuern und Abgaben zahlen.
Every employee has to pay taxes and contributions.
When referring to the distribution or sale of goods, 'Abgabe' (dispensing/distribution) is often connected with a condition or restriction, for example 'Abgabe nur in kleinen Mengen' (dispensing only in small quantities) or 'Abgabe nur an Volljährige' (sale only to adults).
Die Abgabe dieses Medikaments erfolgt nur gegen Rezept.
This medication is dispensed only with a prescription.
task / function / surrender
'die Aufgabe' and 'die Abgabe' look very similar and can easily be confused in a learning context. 'die Aufgabe' is usually the work that you have to do or solve. 'die Abgabe' is the moment or process of submitting or handing something in, for example a term paper or a form. In a course, the task can therefore be worked on first, and then comes the submission. In certain fixed contexts, 'Aufgabe' can also mean posting or mailing an item at the post office, but in everyday language, when talking about assignments and documents, 'Abgabe' is usually more precise.

Die Abgabe der Bewerbung ist heute nur bis 12 Uhr möglich.
Applications can only be submitted until 12 o'clock today.
Die Aufgabe ist einfach, aber wir haben nur wenig Zeit dafür.
The task is simple, but we have very little time for it.