Страховой депозит указан в акте возврата.

Because депозит is the grammatical subject of the sentence, so it appears in the nominative case.

In Страховой депозит указан в акте возврата, the basic structure is:

• страховой депозит = the security deposit
• указан = is stated / is indicated
• в акте возврата = in the return report/document

So the sentence is literally built like The security deposit is stated in the return document.

Указан is the short-form passive participle of the verb указать, which means to indicate, to specify, or to state.

So указан means something like:

• indicated
• specified
• stated

In this kind of sentence, Russian often uses a short passive participle where English uses is + past participle:

• Депозит указан = The deposit is specified / is stated

Even though the Russian form looks like a past participle, in sentences like this it often describes a current stated fact.

Because указан must agree with депозит, and депозит is:

• masculine
• singular

So the short-form passive participle is also masculine singular:

• masculine singular: указан
• feminine singular: указана
• neuter singular: указано
• plural: указаны

For example:

• Сумма указана = The amount is stated
• Условие указано = The condition is stated
• Данные указаны = The data are stated

Not exactly in the same way as English past tense.

Formally, it comes from a participial form related to a completed action, but in sentences like this it usually describes a present result or current state:

• Страховой депозит указан в акте возврата = The security deposit is listed in the return document

So in translation, English often uses the present: is indicated, is specified, is stated.

If you wanted a clearly ongoing verbal meaning, Russian might use указывается instead, but that would sound a bit different in style.

Good question. Both can be translated as is indicated/stated, but they are used differently.

• указан = short passive participle; often sounds like a finished/resulting state
• указывается = present-tense passive/reflexive verb; often sounds more like a general rule, formal statement, or process

Compare:

• Страховой депозит указан в акте возврата
  = The security deposit is stated in the return report/document.
  This sounds like a fact about that document.

• Страховой депозит указывается в акте возврата
  = The security deposit is stated in the return report/document.
  This can sound more like that is where it is normally stated or that is how the document works.

In legal, administrative, and written contexts, both are possible, but указан is very natural here.

Because the preposition в here means in, and with that meaning it requires the prepositional case.

So:

• акт = nominative
• в акте = in the document/report

This is a standard pattern:

• в договоре = in the contract
• в документе = in the document
• в приложении = in the appendix

So в акте возврата means in the return report/document.

Because возврата is in the genitive case and modifies акт.

The base phrase is:

• акт возврата

Literally: act/report of return

This is a very common Russian noun + noun pattern, where the second noun goes into the genitive to show a relationship:

• договор аренды = rental agreement
• адрес офиса = office address
• дата платежа = payment date
• акт возврата = return report/document

So:

• в акте возврата = in the return report/document

Here only акт changes after в, becoming акте, while возврата stays genitive because it depends on акт.

Not in the everyday English sense of act.

In administrative, legal, and business Russian, акт often means a formal document, report, certificate, or record confirming something.

So акт возврата is not an act in the English theatrical or behavioral sense. It is more like:

• return report
• return document
• handover-back document
• return certificate

The exact English translation depends on the situation, but grammatically the Russian phrase is straightforward: акт + возврата = a document connected with returning something.

Because Russian normally omits the verb to be in the present tense.

So where English says:

• The security deposit is stated in the return document

Russian simply says:

• Страховой депозит указан в акте возврата

This is completely normal. Russian does not usually use a present-tense equivalent of is/am/are in this kind of sentence.

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

For example, these are all possible:

• Страховой депозит указан в акте возврата.
• В акте возврата указан страховой депозит.

Both mean essentially the same thing, but the emphasis shifts slightly.

• Страховой депозит указан... starts with the deposit, so it puts that topic first.
• В акте возврата указан... starts with the document, so it highlights where the information appears.

The original sentence is neutral and natural.

Страховой депозит is a formal phrase often used in rental, hotel, or contract language. It usually means security deposit.

Залог can also sometimes mean deposit or security, but it is broader and can have different meanings depending on context, including:

• collateral
• pledge
• security
• deposit

So in many rental contexts:

• страховой депозит = a more formal, explicit security deposit
• залог = often a shorter everyday term, but it can be less precise

They may overlap in meaning, but they are not always perfectly interchangeable.

Yes, it sounds fairly formal and document-like.

Clues include:

• страховой депозит rather than a more casual phrase
• указан in the short passive form
• акт возврата, which is administrative/legal terminology

This is the kind of wording you would expect in:

• contracts
• rental paperwork
• official correspondence
• inspection or handover documents

It is grammatically normal Russian, but stylistically it belongs to a formal register.

A helpful stress pattern is:

Страхово́й депози́т указа́н в а́кте возвра́та.

Main stresses:

• страхово́й
• депози́т
• указа́н
• а́кте
• возвра́та

A few notes:

• о in unstressed syllables is usually reduced in pronunciation
• в акте is pronounced smoothly together in connected speech
• the final intonation is neutral and falling, as in a standard statement

Yes. Указан usually means that the information is specified, listed, or stated in the document.

It does not focus on the physical act of writing. Instead, it means that the document contains that information.

Depending on context, English translations could be:

• is stated
• is specified
• is indicated
• is listed

All of these are close in meaning here.