El reemborsament arriba demà.

Because Catalan normally uses an article with a specific singular noun. So el reemborsament means the refund / the reimbursement.

In English, short messages sometimes drop the article, but in normal Catalan you usually keep it.

Because reemborsament is a masculine noun, so it takes el in the singular:

• el reemborsament
• els reemborsaments

This is something you usually have to learn with the noun.

Catalan often uses the present tense for a future event, especially when it is planned, expected, or clearly linked to a time expression such as demà.

So El reemborsament arriba demà is natural and means that the refund is expected tomorrow.

This is similar to English sentences like The train leaves tomorrow, although Catalan does this quite freely.

Yes. Arribarà is the simple future, and it is also correct.

The difference is mostly one of style or nuance:

• arriba demà = very natural, often used for something scheduled or expected
• arribarà demà = more explicitly future

Both are correct here.

Yes. In Catalan, arribar can be used for things like payments, transfers, packages, messages, or refunds when they are expected to come through or arrive.

So El reemborsament arriba demà sounds natural.

Depending on context, people might also use other expressions, but arribar works well.

Because demà is a time adverb meaning tomorrow, and in Catalan it normally appears without a preposition.

So you say:

• arriba demà
• vindré demà
• demà treballo

Not a demà or en demà in this kind of sentence.

Yes. A very natural alternative is:

Demà arriba el reemborsament.

Both orders are correct:

• El reemborsament arriba demà.
• Demà arriba el reemborsament.

Putting demà first can give a little more emphasis to the time.

Demà is stressed on the last syllable: de-MÀ.

The accent mark shows that final stress. Without the accent, the reader might expect a different stress pattern.

So the accent is important both for spelling and pronunciation.

No. Reemborsament is a good word for reimbursement / refund, especially in financial or formal contexts.

But in some situations you may also hear devolució, especially when talking about money being returned after a purchase.

Very roughly:

• reemborsament = reimbursement / refund
• devolució = return, and sometimes refund depending on context

So reemborsament is correct here, but it is not the only possible word in all situations.

Arriba is the third-person singular form of the verb arribar.

Here it matches the subject el reemborsament, which is singular:

• jo arribo
• tu arribes
• ell/ella arriba

So El reemborsament arriba literally means The refund arrives.