Hạn trả của bản in là ngày mai.

Hạn trả means the due date / return deadline.

• hạn = limit, deadline
• trả = return, give back

Together, hạn trả is the date by which something must be returned.

In other contexts, trả can also mean pay, but here it means return.

Bản in means a printout, printed copy, or printed version.

• bản often means a copy, version, or document
• in means print / printing

So bản in is literally printed copy.

Của shows possession or relation, similar to of in English.

So:

• hạn trả của bản in = the return deadline of the printout
• more naturally in English: the printout’s return deadline or the due date for the printout

It links hạn trả and bản in.

Vietnamese often builds noun phrases differently from English.

Here the structure is:

• Hạn trả = the due date
• của bản in = of the printout
• là ngày mai = is tomorrow

So the full structure is:

[Due date] + [of the printout] + [is tomorrow]

This is very normal Vietnamese word order. English often prefers The printout’s due date is tomorrow, but Vietnamese commonly says it more like The due date of the printout is tomorrow.

Là is the linking verb, like is / am / are in English.

So:

• Hạn trả của bản in = the printout’s due date
• là ngày mai = is tomorrow

Together: Hạn trả của bản in là ngày mai. = The printout’s due date is tomorrow.

In simple identification or definition sentences, là is very common.

Usually, in this sentence, là should stay.

Without là, the sentence would sound incomplete or less standard:

• Hạn trả của bản in ngày mai sounds awkward here

Since the sentence is clearly saying X is Y, là is the natural connector.

Vietnamese does not use articles like a, an, and the the way English does.

So bản in can mean:

• a printout
• the printout
• printouts

The exact meaning depends on context.

In this sentence, context tells us it refers to a specific printout or printed copy.

Literally, ngày mai means tomorrow.

In this sentence, Hạn trả của bản in là ngày mai, it means:

• the due date is tomorrow

Because it is talking about a deadline, English may naturally interpret that as it is due by tomorrow or it must be returned tomorrow, but the Vietnamese phrase itself is simply tomorrow.

It could in isolation, because trả has several meanings, including:

• return
• pay
• answer / reply in some compounds

But in hạn trả của bản in, the context strongly suggests return. A printout is something you might borrow and then return, so return deadline makes sense.

Yes, it is grammatical and natural.

It sounds like a formal or neutral way to state a due date. Vietnamese often uses this kind of structure in schools, offices, and libraries.

Depending on context, people might also say similar things in other ways, but this sentence is perfectly normal.

Sometimes Vietnamese does allow nouns to be placed together without của, especially in compact or administrative style. However, in this sentence, hạn trả của bản in is clearer and more standard.

• hạn trả của bản in = clearly the return deadline of the printout
• hạn trả bản in may sound more compressed and less explicit

For learners, using của here is a safe and natural choice.

It follows a very common Vietnamese pattern:

[noun phrase] + là + [noun phrase / time expression]

Here:

• Hạn trả của bản in = subject noun phrase
• là = linking verb
• ngày mai = complement

So it is basically an X is Y sentence:

• The due date for the printout is tomorrow.