Faturada mükerrer ücret var.

Faturada is fatura + the locative suffix -da, which means in / on / at.

So:

• fatura = bill, invoice
• faturada = on the bill / in the invoice

In this sentence, the locative shows where the duplicate charge appears.

A very common Turkish pattern is:

• X-da Y var = There is Y in/on X

So Faturada mükerrer ücret var follows that pattern exactly.

Mükerrer means duplicate, repeated, entered twice, charged twice.

In billing or administrative language, it often refers to something that appears more than once by mistake, such as:

• mükerrer ödeme = duplicate payment
• mükerrer kayıt = duplicate record
• mükerrer ücret = duplicate charge / repeated fee

It is a somewhat formal or bureaucratic word, so it sounds very natural in billing, accounting, and official contexts.

In Turkish, adjectives normally come before the noun they describe.

So:

• mükerrer ücret = duplicate charge
• yüksek ücret = high fee
• ek ücret = extra fee

Also, Turkish adjectives do not change form for singular/plural or gender, so mükerrer stays the same.

Ücret usually means a fee, charge, or payment amount, especially for a service or billed item.

Fiyat usually means price.

So in many situations:

• fiyat = the price of something
• ücret = a fee/charge, often on a bill or for a service

In this sentence, ücret is better because we are talking about something listed on a bill or invoice.

Var means there is / there exists / is present.

It is used to express existence or presence:

• Su var. = There is water.
• Sorun var. = There is a problem.
• Faturada mükerrer ücret var. = There is a duplicate charge on the bill.

This is one of the most common Turkish sentence types. Instead of saying something exactly like English there is, Turkish often uses var.

Because this is not really a standard X is Y sentence. It is an existence sentence: there is Y in/on X.

So Turkish uses:

• var = there is / exists
• yok = there is not / does not exist

Compare:

• Bu ücret yüksek. = This fee is high.
  Here the sentence is descriptive.

• Faturada mükerrer ücret var. = There is a duplicate charge on the bill.
  Here the sentence is existential.

So var is the natural choice.

Turkish often leaves out bir when English would use a/an, especially in existential sentences with var.

So:

• Faturada mükerrer ücret var. = There is a duplicate charge on the bill.

You could say:

• Faturada bir mükerrer ücret var.

But that is usually less neutral and may sound more specific or emphatic, as if you are pointing out one particular duplicate charge.

In many cases, the version without bir is the most natural.

You use yok, not değil.

So:

• Faturada mükerrer ücret yok. = There is no duplicate charge on the bill.

This is because var / yok form a natural pair:

• var = there is
• yok = there is not

Using değil here would not be the normal structure.

Yes, Turkish word order is flexible, but the original order is very natural.

The neutral version is:

• Faturada mükerrer ücret var.

This presents the location first, then the thing that exists there.

Other orders are possible for emphasis, but they may sound less neutral:

• Mükerrer ücret faturada var.
  This puts more emphasis on mükerrer ücret.

• Var faturada mükerrer ücret.
  This is not the normal neutral order.

For learners, the safest pattern is:

• Location + thing + var/yok

It can mean either, depending on context.

Common possibilities include:

• an invoice
• a utility bill
• a billing statement
• a formal bill for payment

So Faturada mükerrer ücret var could naturally be understood as:

• there is a duplicate charge on the bill
• there is a duplicate fee on the invoice

The exact English word depends on the situation.

Yes, it sounds fairly formal or administrative, mainly because of mükerrer.

A customer service representative, accountant, bank employee, or billing department might say this very naturally.

In more everyday speech, a person might choose simpler wording, such as:

• Faturada aynı ücret iki kez yazılmış.
• Faturada ücret iki kere alınmış.
• Faturada çift ücret var.

These alternatives are less technical, though not always identical in meaning.

Roughly, it is pronounced something like mü-ker-rer.

A few pronunciation notes:

• ü is like the German ü or the French u in tu
• k is a normal k
• the r sounds are clearly pronounced
• the doubled consonant feeling in -rr- may sound stronger than in English

You do not need a perfect accent to be understood, but the most important part for English speakers is usually producing ü correctly.

Yes, that is grammatically possible.

• Faturada mükerrer ücret var.
• Faturada mükerrer bir ücret var.

The version without bir is more neutral and natural in many contexts.

The version with bir can sound a bit more like:

• there is a certain duplicate charge
• there is one duplicate charge

So if you just want the plain statement, the original sentence is the better default.