Chcę przeliczyć należność.

Because Polish often leaves out subject pronouns when the verb already shows who is doing the action.

Chcę already means I want, so ja is not necessary.

You could say Ja chcę przeliczyć należność, but that sounds more emphatic, like:

• I want to recalculate it.
• It is I who want to do it.

The version without ja is the normal, neutral one.

Chcę is the 1st person singular present tense form of chcieć = to want.

So:

• chcę = I want
• chcesz = you want
• chce = he/she/it wants

In Polish, after chcę, you normally use an infinitive:

• Chcę pracować = I want to work
• Chcę zapłacić = I want to pay
• Chcę przeliczyć należność = I want to recalculate the amount due

Because after chcę in Polish, the next verb is usually in the infinitive.

So the structure is:

chcę + infinitive

Examples:

• Chcę iść = I want to go
• Chcę kupić = I want to buy
• Chcę przeliczyć należność = I want to recalculate the amount due

So przeliczyć is not conjugated here because chcę is the main verb, and przeliczyć expresses the action wanted.

This is about aspect, which is very important in Polish.

• przeliczyć = perfective
• przeliczać = imperfective

Here, przeliczyć suggests one completed action: the speaker wants to recalculate the amount and get a finished result.

So:

• Chcę przeliczyć należność = I want to recalculate the amount due, once, to completion.
• Chcę przeliczać należność would sound more like I want to be recalculating it, or I want to recalculate it repeatedly/habitually, which is much less likely here.

In most ordinary contexts, przeliczyć is the natural choice.

The verb przeliczyć comes from liczyć = to count / calculate, and the prefix prze- often adds the idea of again, through, or into another form.

Depending on context, przeliczyć can mean:

• to recount
• to recalculate
• to work out again
• to convert by calculation

In this sentence, with należność, it most naturally means something like:

• to recalculate the amount due
• to recalculate the payable amount
• to work out the payment again

So this is probably not about counting physical objects, but about a financial amount.

Należność is a somewhat formal or business/financial word.

It can mean things like:

• amount due
• sum owed
• payment due
• receivable
• claim or money owed, depending on context

In everyday speech, people might sometimes use other expressions instead, such as:

• kwota do zapłaty = amount to pay
• opłata = fee/payment
• rachunek = bill

So należność sounds a bit more official, administrative, legal, or financial.

It is the direct object here, so it is in the accusative case.

However, for this noun, the nominative and accusative singular look the same:

• nominative: należność
• accusative: należność

This happens with many feminine nouns ending in -ść or another soft consonant.

So even though the case changes grammatically, the form does not visibly change in this sentence.

For comparison, another case does look different:

• genitive: należności

Polish does not have articles like English a/an and the.

So należność can mean:

• a payment due
• the payment due
• an amount owed
• the amount owed

Context tells you which meaning is intended.

If you want to be more specific, Polish can use other words, for example:

• ta należność = this / that amount due
• jakaś należność = some amount due

But in a normal sentence, no article is needed.

Yes. Polish word order is more flexible than English because case endings and verb forms carry a lot of grammatical information.

The most neutral order here is:

Chcę przeliczyć należność.

Other orders are possible, but they change the emphasis. For example:

• Należność chcę przeliczyć.
  Emphasizes należność.

• Przeliczyć należność chcę.
  Possible, but much less neutral and more stylistically marked.

So for a learner, the given order is the safest and most natural one.

A rough pronunciation guide is:

Chcę przeliczyć należność
≈ htsen ფსhe-LI-chić na-LEZH-noshch

A few important points:

• ch sounds like a strong h sound, as in German Bach
• cz sounds like ch in chop, but harder
• rz here sounds like zh, like s in measure
• ć is a soft sound, a bit like a very soft ch
• ę at the end of chcę is often pronounced only lightly nasal, and in everyday speech it may sound close to a plain e

More precise pronunciation:

• chcę ≈ htsę / htse
• przeliczyć ≈ pshe-LI-chić
• należność ≈ na-LEZH-noshch

The stress in Polish normally falls on the second-to-last syllable, so:

• przeLIczyć
• naLEŻność

Yes, it is grammatical and natural, but it sounds a bit formal because of należność.

You are likely to hear something like this in:

• finance
• billing
• accounting
• customer service
• administrative contexts

In more casual everyday speech, someone might choose a less formal noun depending on the situation, for example:

• Chcę przeliczyć kwotę. = I want to recalculate the amount.
• Chcę przeliczyć rachunek. = I want to recalculate the bill.

So the sentence is natural, but its style is more official than casual.