Ich mache die Zusatzkosten geltend.

Geltend machen is a fixed expression. It usually means to claim, to assert, or to invoke something, especially in a formal, legal, insurance, or administrative context.

So in Ich mache die Zusatzkosten geltend, the speaker is not just “making” something in a literal sense. They are formally claiming those extra costs, for example for reimbursement or compensation.

You should learn geltend machen as one unit, not by translating machen and geltend separately.

Common things you can geltend machen:

• Ansprüche = claims/entitlements
• Rechte = rights
• Kosten = costs/expenses
• Schadensersatz = damages/compensation

This is because geltend machen behaves like a fixed verbal expression whose parts get split in a main clause.

In a normal German main clause:

• the finite verb goes in second position
• the other verbal part often goes near the end

So:

• Ich mache die Zusatzkosten geltend.

Here:

• mache = finite verb in second position
• geltend = final verbal element at the end

This creates the typical German verb bracket:

• Ich | mache | die Zusatzkosten | geltend

That is why you do not say:

• Ich mache geltend die Zusatzkosten. ❌

Die Zusatzkosten is the direct object, so it is in the accusative case.

In this sentence:

• Ich = subject, nominative
• mache ... geltend = verb
• die Zusatzkosten = accusative object

The article is die because Zusatzkosten is a plural noun, and the plural definite article is die in both nominative and accusative.

So here die does not mean feminine singular. It means plural.

Zusatzkosten is plural.

It is a compound noun:

• Zusatz- = additional, extra, supplementary
• Kosten = costs/expenses

So Zusatzkosten means additional costs or extra expenses.

A useful point for learners: Kosten is normally used as a plural noun when talking about expenses/costs. So Zusatzkosten is also usually plural.

That is why the sentence says:

• die Zusatzkosten

and not a singular form.

Yes, it sounds fairly formal and is very common in:

• business German
• insurance language
• legal language
• official correspondence
• reimbursement or billing contexts

A native speaker might use it in situations like:

• claiming expenses from an employer
• claiming extra costs from an insurance company
• asserting costs in a legal dispute

In casual everyday speech, people might choose a simpler wording depending on the situation, but geltend machen is very natural when the claim is official or formal.

The phrase stays together as geltend machen, but its position changes according to normal German word order.

Examples:

Present tense, main clause

• Ich mache die Zusatzkosten geltend.

Subordinate clause

• ..., weil ich die Zusatzkosten geltend mache.

Perfect tense

• Ich habe die Zusatzkosten geltend gemacht.

Modal verb

• Ich will die Zusatzkosten geltend machen.

So a good pattern to remember is:

• main clause: mache ... geltend
• infinitive: geltend machen
• perfect participle: geltend gemacht

No. It is used with many kinds of formal claims or rights.

Very common combinations include:

• Ansprüche geltend machen = claim entitlements/claims
• Rechte geltend machen = assert rights
• Forderungen geltend machen = assert demands/claims
• Schadensersatz geltend machen = claim damages
• Kosten geltend machen = claim costs/expenses

So die Zusatzkosten geltend machen is just one very common use of the phrase.

Not exactly.

These words can overlap, but they are not identical:

• geltend machen = formally claim or assert something you believe you are entitled to
• fordern = demand
• beantragen = apply for/request officially

For example:

• Ich mache die Zusatzkosten geltend.
  = I am claiming these extra costs as something that should be recognized/reimbursed.

• Ich fordere die Erstattung der Zusatzkosten.
  = I demand reimbursement of the extra costs.

• Ich beantrage die Erstattung der Zusatzkosten.
  = I apply for reimbursement of the extra costs.

So geltend machen often suggests:

• you already have a basis for the claim
• you are asserting that basis formally

The structure is:

• Ich = subject
• mache ... geltend = verb expression
• die Zusatzkosten = object

So the sentence follows a common German main-clause pattern:

Subject + finite verb + object + final verbal element

You can think of it like this:

• Ich
• mache
• die Zusatzkosten
• geltend

This is a very common pattern in German whenever the verb is split or has another element that belongs at the end of the clause.