Poplatník podá daňové přiznání.

• poplatník = taxpayer
• podá = will submit / will file
• daňové přiznání = tax return

So the sentence means something like The taxpayer will file a tax return.

Because podat is a perfective verb. In Czech, the present-tense forms of perfective verbs usually refer to the future.

So:

• podá = he/she/it will submit
• not normally he/she submits in an ongoing/habitual sense

If you wanted the ongoing or habitual present, Czech would usually use the imperfective verb:

• podává = submits / is submitting / submits regularly

This is a very common thing for English speakers to notice, because Czech uses aspect where English often uses tense alone.

The infinitive is podat.

A useful mini-paradigm:

• podat = to submit, to file
• podám = I will submit
• podáš = you will submit
• podá = he/she/it will submit

In this sentence, podá is 3rd person singular.

Because poplatník is in the nominative case, which is the usual case for the subject of the sentence.

Here:

• poplatník = nominative singular = the taxpayer
• daňové přiznání = the thing being filed, so it is the direct object

A Czech learner often identifies the subject by case, not just by position in the sentence.

Because it is a neuter singular direct object.

The noun is:

• přiznání = a neuter noun

The adjective must agree with it:

• daňové matches přiznání in gender, number, and case

So:

• daňové přiznání = nominative/accusative singular neuter

Since this is the object after podat, it is in the accusative. But for many neuter nouns, the nominative and accusative look the same, so the form does not change visibly.

Because the noun přiznání is neuter singular.

Czech adjectives change to match the noun:

• daňový = masculine singular
• daňová = feminine singular
• daňové = neuter singular

Since přiznání is neuter, the correct form is daňové přiznání.

Grammatically, poplatník is a masculine noun, but in legal or administrative language it is often used in a general sense, like English taxpayer.

There is also a specifically feminine form:

• poplatnice = female taxpayer

But in official-style Czech, the masculine form is often used generically unless the text specifically wants to mark female gender.

Czech has no articles like English a/an/the.

So poplatník can mean:

• a taxpayer
• the taxpayer

and daňové přiznání can mean:

• a tax return
• the tax return

Which one is meant depends on context. In an isolated sentence like this, English might translate it either way, depending on the situation.

Yes. Czech word order is more flexible than English because case endings help show who is doing what.

The neutral order here is:

• Poplatník podá daňové přiznání.

But you could also see:

• Daňové přiznání podá poplatník.
• Poplatník daňové přiznání podá.

These versions shift the focus or emphasis, but the basic meaning stays the same: the taxpayer will file the tax return.

Yes, it sounds formal, administrative, or legal.

Words like:

• poplatník
• daňové přiznání
• podat

are very typical of official instructions, laws, tax guides, and government forms.

In everyday speech, someone might say something less formal depending on context, but this sentence sounds perfectly natural in official Czech.

A rough pronunciation guide is:

• Poplatník ≈ PO-plat-neek
• podá ≈ po-DAA
• daňové ≈ da-nyo-ve
• přiznání ≈ this is the trickiest one; roughly przhi-znaa-nee

A few pronunciation notes:

• Czech stress is usually on the first syllable: POplatník, POdá, DAňové, PŘIznání
• á and í are long vowels
• ň sounds like ny in canyon
• ř is a special Czech sound with no exact English equivalent

Yes. In English, both submit and file can work here.

• podat přiznání = to submit/file a return
• podat žádost = to submit/file an application

For taxes, English often prefers file a tax return, but submit a tax return is also perfectly understandable.