За перевод денег банк взял небольшую комиссию.

Here за means for, in the sense of in exchange for a service or as payment for something.

So:

• за перевод денег = for the transfer of money
• The bank took a commission for performing that service.

With this meaning, за normally takes the accusative case. That is why you get:

• за перевод
  not за перевода

This use of за is very common in Russian:

• за работу = for the work
• за доставку = for delivery
• за обслуживание = for service

So in this sentence, За перевод денег sets the context: for the money transfer.

Because за with the meaning for requires the accusative case.

The noun перевод is masculine and inanimate. For many masculine inanimate nouns, the nominative and accusative singular have the same form.

So:

• nominative: перевод
• accusative: перевод

That is why nothing visibly changes.

If the noun had a different declension pattern, you would see the ending change more clearly.

Yes, перевод can mean both:

• translation
• transfer

Russian uses the same noun for several kinds of moving something from one place/form to another.

In this sentence, the phrase перевод денег clearly means money transfer, not translation of money, because:

• денег means of money
• the context is a bank
• banks charge commissions for transfers

So this is a good example of a word whose meaning depends strongly on context.

Because денег is the genitive plural form of деньги.

The phrase перевод денег means literally transfer of money. After a noun like перевод, Russian often uses the genitive to show what is being transferred.

Compare:

• перевод денег = transfer of money
• покупка машины = purchase of a car
• чтение книги = reading of a book

So:

• деньги = money, funds
• денег = of money

This is one of the most common noun + genitive patterns in Russian.

Because банк is the subject of the sentence.

The sentence structure is:

• За перевод денег = for the transfer of money
• банк = the bank
• взял = took / charged
• небольшую комиссию = a small commission

So банк is the thing performing the action, and that means it stays in the nominative case.

Yes, literally взять means to take. But in financial contexts, Russian often uses взять in a way that English would translate as:

• charge
• take
• collect

So:

• банк взял комиссию = the bank charged a commission

This is very natural Russian. English and Russian simply prefer different verbs here.

You can think of it like this:

• Russian: the bank took a commission
• natural English: the bank charged a commission

Взял is the perfective past of взять, while брал is the imperfective past of брать.

Here взял is used because the sentence refers to a completed action:

• the bank charged the commission
• the action happened as a single finished event

So взял fits well.

Compare:

• банк взял комиссию = the bank charged a commission / took a commission once, as a completed fact
• банк брал комиссию = the bank used to charge a commission / was charging a commission / charged commissions repeatedly

So the perfective form is the natural choice for one specific completed transaction.

Because комиссию is the direct object of взял, so it goes into the accusative case. The adjective небольшую has to agree with the noun in:

• gender
• number
• case

The noun is:

• комиссия — feminine singular nominative

In the accusative singular, it becomes:

• комиссию

And the adjective небольшая becomes:

• небольшую

So:

• nominative: небольшая комиссия
• accusative: небольшую комиссию

This is standard adjective-noun agreement.

Exactly. Комиссию is the direct object of the verb взял.

The bank did the action, and the commission is what was taken/charged.

So:

• банк = subject, nominative
• комиссию = direct object, accusative

This is one of the core sentence patterns in Russian, just like in English:

• The bank charged a commission.

Grammatically, yes. But stylistically, небольшую комиссию sounds more natural here.

Why?

• небольшой often means small/modest/not large in a neutral, formal way
• маленький often refers more literally to physical size, or can sound less idiomatic in formal financial contexts

So in banking or official language:

• небольшая комиссия = very natural
• маленькая комиссия = understandable, but less idiomatic

English does something similar: in financial language, small commission is fine, but Russian often prefers небольшая.

Yes, absolutely. That version is very natural too.

Russian word order is flexible, so both are correct:

• За перевод денег банк взял небольшую комиссию.
• Банк взял небольшую комиссию за перевод денег.

The difference is mostly one of focus and information structure.

Starting with За перевод денег emphasizes the service first:

• As for the money transfer, the bank charged a small commission.

Starting with Банк is a more neutral subject-first order:

• The bank charged a small commission for the money transfer.

So the original word order sounds slightly more focused on what the fee was for.

Because Russian has no articles like English the and a/an.

So:

• банк can mean the bank or a bank
• комиссию can mean a commission or the commission

The exact meaning depends on context.

In this sentence, English would most naturally say:

• The bank charged a small commission for the money transfer.

Russian does not need separate words to express that.

Yes, комиссия is a very common and natural word for a bank fee, service fee, or commission.

In banking Russian, you will often see:

• комиссия банка = bank fee / bank commission
• взимать комиссию = to charge a fee
• без комиссии = without commission / no fee

So this sentence sounds completely natural in a financial context.

In this sentence, native speakers will understand it as for the transfer of money, not because of it.

That is because:

• the context is financial
• взять комиссию за что-то is a very common pattern meaning to charge a fee for something

So the combination of взять комиссию + за strongly points to the meaning for a service rendered.

It is not an idiom in the strict sense, but it is a very common standard collocation.

It simply means:

• money transfer
• transfer of funds

You will often meet it in banking, apps, forms, and customer service:

• международный перевод денег = international money transfer
• комиссия за перевод денег = fee for transferring money
• услуга перевода денег = money transfer service

So it is a phrase worth memorizing as a common chunk.