Je příjem podle potvrzení o příjmech správný?

Because this is a yes/no question in Czech.

In a neutral statement, you would usually have:

Příjem podle potvrzení o příjmech je správný.
= The income according to the income certificate is correct.

To turn that into a yes/no question, Czech often puts the verb first:

Je příjem podle potvrzení o příjmech správný?
= Is the income according to the income certificate correct?

So starting with je is very normal for this kind of question.

A word-by-word breakdown:

• Je = is
• příjem = income
• podle = according to / based on
• potvrzení = confirmation / certificate
• o příjmech = about income / of income
• správný = correct

So the structure is roughly:

Je + příjem + podle potvrzení o příjmech + správný?
= Is the income, according to the income certificate, correct?

They are two different forms of the same noun příjem (income).

• příjem = singular base form
• příjmech = plural locative form

Why?

1. The first příjem is the main subject of the sentence:
   Je příjem ... správný?
   So it stays in the basic nominative singular form.

2. In o příjmech, the preposition o requires the locative case.
   Also, it is plural here, so příjem becomes příjmech.

So the sentence uses:

• příjem = the income
• o příjmech = about incomes / income details

In this official-document context, potvrzení o příjmech is a standard phrase meaning something like income certificate or certificate of income.

Because the preposition podle always takes the genitive case.

So after podle (according to), the following noun must be in genitive:

• potvrzení = nominative singular
• potvrzení = genitive singular too

This noun happens to look the same in both cases, which can be confusing.

So:

• podle potvrzení = according to the certificate

Even though the form does not change visibly, the grammar still does: it is genitive because of podle.

Because potvrzení is a neuter noun of a type whose nominative singular and genitive singular are identical.

So:

• nominative: potvrzení
• genitive: potvrzení

This is very common with many Czech neuter nouns ending in -í.

So even though podle requires the genitive, the word still looks the same. That is normal Czech grammar, not an exception in this sentence.

Because the preposition o usually takes the locative case when it means about / concerning.

The dictionary form is:

• příjem = income

But after o, you need locative. Here it is plural:

• singular locative: o příjmu
• plural locative: o příjmech

So:

potvrzení o příjmech
literally = certificate about incomes

In smoother English, that becomes income certificate or certificate of income.

Because správný is an adjective and it must agree with příjem.

The noun příjem is:

• masculine inanimate
• singular
• nominative

So the adjective must also be:

• masculine inanimate
• singular
• nominative

That gives:

správný

Examples of agreement:

• správný příjem = correct income
• správná částka = correct amount
• správné potvrzení = correct certificate

So správný is the form that matches příjem.

In Czech, it is very common for the adjective or complement in this kind of sentence to come at the end.

Compare:

• Příjem je správný. = The income is correct.
• Je příjem ... správný? = Is the income ... correct?

Putting správný at the end sounds natural and lets the sentence build toward the main point: whether the income is correct.

Czech word order is more flexible than English, but this version is very normal and neutral.

Yes, Czech word order is flexible, but different orders can sound more marked or emphasize different parts.

For example:

• Je příjem podle potvrzení o příjmech správný?
  Neutral and natural.

• Je správný příjem podle potvrzení o příjmech?
  Possible, but it may sound like you are focusing more on correct income as a phrase.

• Příjem podle potvrzení o příjmech je správný?
  Possible in speech, often with a checking or surprised tone, but less neutral as a standard yes/no question.

So the original sentence is a very good standard version.

It is a common official phrase for a document confirming someone’s income.

Depending on context, it could be translated as:

• income certificate
• certificate of income
• proof of income
• sometimes roughly income statement

It does not necessarily mean a bank receipt. In administrative Czech, potvrzení often means an official confirmation document.

So in this sentence, podle potvrzení o příjmech means something like:

according to the proof-of-income document

Often yes, especially in financial or official contexts.

But Czech can use different words depending on the exact meaning:

• příjem = income, earnings, receipts
• výdělek = earnings, what someone earns by work
• mzda / plat = wage / salary

In this sentence, příjem is the right word because official income documents often refer to total income, not just salary.

Yes, it sounds fairly formal or administrative.

Clues:

• podle = according to
• potvrzení o příjmech = an official-sounding document phrase
• správný = correct

This is the kind of sentence you might see or hear in:

• a bank
• a government office
• HR or payroll
• a loan or benefits application process

In everyday casual conversation, people might say something simpler depending on context.