Die Rückerstattung kommt später.

Because Rückerstattung is a feminine noun in German, so its nominative singular article is die.

In this sentence, die Rückerstattung is the subject, so it stays in the nominative case:

• die Rückerstattung = the refund

A useful thing to remember is that you usually have to learn the noun and its gender together:

• die Rückerstattung
• not just Rückerstattung

Rückerstattung means refund or reimbursement, depending on context.

It is built from:

• rück- = back
• Erstattung = reimbursement / compensation / repayment

So the idea is something like paying something back.

Depending on the situation, English might translate it as:

• refund
• reimbursement
• repayment

Yes, kommt literally means comes, from the verb kommen = to come.

But in German, just like in English, come can be used in a broader sense than physical movement. Here it means something like:

• arrives
• comes through
• is issued
• will happen later

So Die Rückerstattung kommt später is a natural way to say that the refund will arrive or be processed later.

German very often uses the present tense to talk about the future when the time is clear from context.

Here, später already shows that it will happen later, so the present tense is enough:

• Die Rückerstattung kommt später. = The refund will come later.

This is very common in German. You do not need a future form every time.

For example:

• Ich komme morgen. = I’m coming tomorrow.
• Das Paket kommt später. = The package will arrive later.

Später means later.

That is different from spät, which means late.

Compare:

• spät = late
• später = later

So:

• Die Rückerstattung kommt spät. = The refund comes late / is late.
• Die Rückerstattung kommt später. = The refund comes later.

In your sentence, the meaning is about a later time, so später is the correct choice.

The structure is:

• Die Rückerstattung = subject
• kommt = verb
• später = time adverb

So the sentence follows the normal German main-clause pattern:

Subject + verb + other information

German main clauses usually place the conjugated verb in the second position:

• Die Rückerstattung kommt später.

If you move another element to the front, the verb still stays second:

• Später kommt die Rückerstattung.

That version is grammatical too, but it sounds more marked or more focused on later.

Because all nouns are capitalized in German.

So in this sentence:

• Rückerstattung is capitalized because it is a noun
• kommt and später are not capitalized because they are not nouns

This is one of the most noticeable spelling rules in German.

A rough pronunciation guide is:

RÜ-ker-shtat-toong

A few important parts:

• ü is not like normal English u
• ck sounds like a clear k
• st in many German words is pronounced sht
• ung is pronounced roughly like oong, but shorter and more German-like

If you want to break it up:

• Rück
• er
• stattung

The hardest sound for English speakers is usually ü. To make it, try saying ee with rounded lips.

Yes, you can. That means essentially the same thing:

• Die Rückerstattung kommt später.
• Die Rückerstattung wird später kommen.

But the first version is usually more natural and more common in everyday German.

The werden + infinitive future form exists, but German often prefers the present tense when the time is already clear.

So in normal conversation, kommt später is usually the better choice.

No. German has several related words, and which one is best depends on context.

Common ones include:

• die Rückerstattung = refund / reimbursement
• die Erstattung = reimbursement
• die Rückzahlung = repayment / refund
• das Geld zurück = money back

For example:

• Die Rückerstattung kommt später. = the refund will come later
• Sie bekommen Ihr Geld später zurück. = you will get your money back later

So Rückerstattung is correct, but it is not the only possible word.

Yes, very often. German uses kommen for many things that arrive, appear, or take place later.

For example:

• Das Paket kommt später. = The package arrives later.
• Die Rechnung kommt noch. = The bill/invoice will come later.
• Die Antwort kommt morgen. = The answer will come tomorrow.

So using kommen with Rückerstattung is completely natural.

It is in the nominative case because it is the subject of the sentence.

You can identify the subject by asking: What is coming later?

Answer:

• Die Rückerstattung

So:

• die Rückerstattung = nominative subject
• kommt agrees with it in the singular

If the noun were an object instead, the article or form might change depending on the case.