Číslo účtu je na výpisu z účtu.

It breaks down like this:

• Číslo účtu = the account number
  • číslo = number
  • účtu = of the account
• je = is
• na výpisu z účtu = on the bank statement / on the account statement
  • na výpisu = on the statement
  • z účtu = from the account / of the account

So the basic structure is:

• subject: Číslo účtu
• verb: je
• location phrase: na výpisu z účtu

Czech often expresses noun + of + noun relationships by putting the second noun in the genitive.

So:

• číslo účtu literally = number of the account
• natural English = account number

This is very common in Czech:

• jméno firmy = name of the company
• konec filmu = end of the film
• adresa školy = address of the school

So číslo účtu is the normal Czech way to say account number.

It is genitive singular.

The dictionary form is účet. Its genitive singular is účtu.

Here it is genitive because číslo účtu means number of the account, and Czech uses the genitive for that kind of relationship.

So:

• účet = account
• účtu = of the account

Because na here means on, and after na in this type of location meaning, Czech uses the locative case.

The noun is:

• výpis = statement, extract

Its locative singular is:

• na výpisu = on the statement

So:

• výpis = basic form
• na výpisu = on the statement

This is the same pattern as:

• na stole = on the table
• na papíře = on the paper
• na seznamu = on the list

Because the preposition z requires the genitive case.

So:

• z účtu = from the account

In the full phrase výpis z účtu, the meaning is literally a statement/extract from the account.

That whole phrase functions like one unit:

• výpis z účtu = bank statement / account statement

So the two occurrences of účtu have different jobs:

• číslo účtu: genitive because it depends on číslo
• z účtu: genitive because it follows z

They look the same, but the reason is different.

Yes, very much.

Výpis z účtu is the standard phrase for bank statement or account statement.

Literally:

• výpis = extract, statement
• z účtu = from the account

You may also hear:

• bankovní výpis = bank statement

But výpis z účtu is extremely common and completely natural.

Because Czech often uses na with things that are understood as surfaces, pages, documents, lists, forms, and similar items.

So na výpisu means something like:

• on the statement
• on the document
• listed on the statement

This is similar to:

• na seznamu = on the list
• na faktuře = on the invoice
• na formuláři = on the form
• na stránce = on the page

Using v / ve would suggest being physically inside something, which is not the usual idea here.

Here is the full case breakdown:

• Číslo — nominative singular
  • it is the subject of the sentence
• účtu — genitive singular
  • depends on číslo
• výpisu — locative singular
  • used after na
• účtu — genitive singular
  • used after z

So the sentence contains three different cases:

• nominative
• genitive
• locative

Because Czech does not have articles like English a and the.

So Czech simply says:

• číslo účtu = account number / the account number
• výpis z účtu = a bank statement / the bank statement

Whether English needs a or the depends on context, but Czech usually leaves that unstated.

That is why the sentence can naturally translate into English with articles even though none appear in Czech.

Yes. Czech word order is more flexible than English word order.

The neutral order here is:

• Číslo účtu je na výpisu z účtu.

But you could also say:

• Na výpisu z účtu je číslo účtu.

That version puts more emphasis on where the account number is.

Very roughly:

• Číslo účtu je na výpisu z účtu. = The account number is on the bank statement.
• Na výpisu z účtu je číslo účtu. = On the bank statement, there is the account number.

Both are grammatical. The difference is mainly emphasis and information flow.

A few things matter here:

• č sounds like ch in check
• í, ú, ý are long vowels
• z in z účtu is pronounced like z, not s

A rough pronunciation guide:

• Číslo ≈ CHEES-lo
• účtu ≈ OOCH-too
• je ≈ ye
• na ≈ nah
• výpisu ≈ VEE-pee-soo
• z účtu ≈ z OOCH-too

A more careful note:

• číslo has stress on the first syllable: ČÍS-lo
• Czech stress is almost always on the first syllable of a word

So the whole sentence is roughly:

CHEES-lo OOCH-too ye nah VEE-pee-soo z OOCH-too

The dictionary forms are:

• číslo = number
• účet = account
• výpis = statement, extract

The forms you see in the sentence are:

• číslo — already in dictionary form
• účtu — from účet
• výpisu — from výpis
• účtu — again from účet

So if you look these words up, you would search for:

• číslo
• účet
• výpis

In a normal full sentence, yes.

• je is the 3rd person singular of být = to be
• here it means is

So:

• Číslo účtu je na výpisu z účtu. = complete sentence

In notes, headings, or very informal fragments, Czech sometimes leaves out forms of to be, but in standard prose and speech this sentence normally includes je.

In most everyday situations, it will be understood as bank statement or account statement.

Literally, it means an extract from an account, so in a broader technical context it could depend on the type of account being discussed. But for a learner, the safe everyday understanding is:

• výpis z účtu = bank statement

So in this sentence, that is almost certainly the intended meaning.