Birim bedel faturada yazıyor.

Word by word:

• birim = unit
• bedel = amount, charge, price, cost
• birim bedel = unit price / unit cost
• faturada = on the invoice / in the invoice
• yazıyor = is written / appears / says

So the sentence is built very compactly in Turkish.

Because -da / -de / -ta / -te is the locative suffix, which means in, on, at.

• fatura = invoice
• faturada = on the invoice

Turkish uses this one suffix for several English prepositions. So although English says on the invoice, Turkish uses the locative form faturada.

This is due to vowel harmony and consonant harmony.

• The last vowel in fatura is a, so the suffix takes the back-vowel form: -da rather than -de.
• The word ends in a vowel, so there is no devoicing effect that would force -ta.

So:

• fatura + da = faturada

You will see the same pattern in words like:

• oda → odada
• masa → masada

Yes, the basic verb yazmak means to write. But in real Turkish, yazıyor can also mean:

• is written
• is stated
• appears
• it says

especially when talking about text on signs, labels, screens, documents, or invoices.

So Faturada yazıyor is a very natural Turkish way to say something like:

• It says on the invoice
• It is written on the invoice

This is one of those places where Turkish and English do not match word-for-word.

Yes, -yor is the present continuous form, but Turkish uses it more broadly than English uses -ing.

Here, yazıyor does not necessarily mean someone is actively writing right now. It often describes a current visible state:

• something is written there
• something appears there
• that is what the document says

So faturada yazıyor is perfectly natural, even though English would usually say is written rather than is writing.

Because Turkish has no articles like a/an/the.

So birim bedel can mean:

• unit price
• the unit price

The exact meaning depends on context. In a real situation, if both speaker and listener know which invoice is being discussed, English will usually use the, but Turkish does not need any separate word for that.

Yes, birim bedel is a set phrase meaning unit price / unit cost.

Turkish often places one noun before another to specify the type of thing being talked about. Here:

• birim tells you the price is calculated per unit
• bedel is the amount/charge/price

So together they function as one noun phrase.

You may also hear birim fiyat, which is another common way to say unit price.

The basic structure is:

• Birim bedel = subject/topic
• faturada = location
• yazıyor = verb

So the order is:

subject + location + verb

This is very natural in Turkish because Turkish usually puts the verb at the end.

English and Turkish differ here:

• English: The unit price is written on the invoice.
• Turkish: Birim bedel faturada yazıyor.

Turkish often does not use a dummy subject like English it.

English needs it in sentences like:

• It says on the invoice
• It is written on the invoice

Turkish can simply say:

• Faturada yazıyor

The subject can be understood from context, or the sentence can be built around the actual thing being talked about, as in:

• Birim bedel faturada yazıyor

So Turkish is often more direct and does not need an extra word like English it.

The progressive suffix is written as -(I)yor, and the first vowel changes according to vowel harmony.

With yaz-, the correct form is:

• yazıyor

Compare:

• geliyor
• görüyor
• okuyor
• yazıyor

So the vowel before yor changes, but yor itself stays the same.

Yes. That is also possible.

• yazıyor = common, natural, conversational; often like it says / it’s written
• yazılı = more explicitly written, and often feels a bit more formal or adjective-like

So:

• Birim bedel faturada yazıyor = very natural spoken Turkish
• Birim bedel faturada yazılı = The unit price is written/stated on the invoice

Both are understandable, but they have slightly different feel.

Because in Turkish, the third person singular often has no extra personal ending in this tense.

Compare:

• yazıyorum = I am writing
• yazıyorsun = you are writing
• yazıyor = he/she/it is writing

So yazıyor already means he/she/it is writing / is written / says, depending on context. Here the subject is birim bedel, which is singular, so yazıyor is the correct form.