Grupa taryfowa jest na fakturze.

A word-for-word breakdown is:

• grupa = group
• taryfowa = tariff, rate-related, pricing-related
• jest = is
• na = on
• fakturze = invoice in the locative case

So the structure is basically:

• Grupa taryfowa = tariff group
• jest na fakturze = is on the invoice

Because taryfowa is an adjective, and in Polish adjectives must agree with the noun they describe in:

• gender
• number
• case

Here the noun is grupa, which is:

• feminine
• singular
• nominative

So the adjective must also be feminine singular nominative:

• grupa taryfowa

Compare:

• grupa taryfowa — feminine
• plan taryfowy — masculine
• konto taryfowe — neuter

Because after na when it means location (on, at), Polish usually uses the locative case.

The base form is:

• faktura = invoice

But after na in this sentence, it changes to locative:

• na fakturze = on the invoice

This is a very common pattern:

• na stole = on the table
• na stronie = on the page
• na fakturze = on the invoice

So:

• faktura = dictionary form
• fakturze = locative singular after na

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

The subject is the thing that is somewhere:

• Grupa taryfowa jest na fakturze.

So grupa taryfowa answers the question what is on the invoice?

That is why it stays in nominative.

In Polish, na is often used for something written, printed, or shown on a surface or document.

So Polish naturally says:

• na fakturze = on the invoice
• na stronie = on the page
• na liście = on the list
• na zdjęciu = in/on the photo, depending on context

Using w fakturze would usually sound wrong here. W means in, and Polish does not normally think of information as being inside an invoice in this context. It is conceptually on the document.

Yes, in a normal full sentence, jest is the standard form.

• Grupa taryfowa jest na fakturze.

Polish sometimes omits forms of to be, but usually not in ordinary statements of location like this. Without jest, the result would sound more like:

• a heading
• a note
• a label
• an incomplete sentence

So if you want a full neutral sentence, keep jest.

Yes. Polish word order is more flexible than English, because the endings show the grammatical roles.

Possible versions include:

• Grupa taryfowa jest na fakturze.
• Na fakturze jest grupa taryfowa.

Both are correct, but the emphasis changes a little.

• Grupa taryfowa jest na fakturze.
  Neutral: the topic is the tariff group.

• Na fakturze jest grupa taryfowa.
  This puts more focus on where it is or introduces what is found there.

In English, word order is more rigid. In Polish, both are natural depending on context.

Because Polish has no articles like English a/an/the.

So:

• grupa taryfowa can mean a tariff group or the tariff group
• faktura can mean an invoice or the invoice

The exact meaning depends on context.

In this sentence, English may translate it as:

• The tariff group is on the invoice.

But Polish does not need a separate word for the.

A rough pronunciation guide is:

• fak-TU-zhe

More precisely:

• fa as in father
• ktur with a short rolled or tapped r
• rze sounds like zhe in measure or vision, but with a Polish rz/ż sound

A few useful pronunciation notes:

• rz here sounds like ż
• u sounds like English oo in food, but shorter
• the stress in Polish is usually on the second-to-last syllable

So:

• fak-TU-rze

It usually refers to a tariff category, rate group, or pricing group, depending on context.

The phrase is common in administrative, billing, utility, telecommunications, or energy contexts. It can refer to the category under which a customer or service is billed.

So even though the sentence structure is simple, the phrase itself is somewhat formal and technical.

Yes, you could, and it would mean something like:

• The tariff group is located on the invoice

But znajduje się is more formal and heavier than jest.

Compare:

• Grupa taryfowa jest na fakturze. — simple, neutral, natural
• Grupa taryfowa znajduje się na fakturze. — more formal, more explicit

In most everyday situations, jest is the better choice.