Срок подачи и сумма к возврату указаны здесь.

Literally, срок means term, period, or deadline, and подачи comes from подача, meaning submission or filing.

So срок подачи means something like:

• submission deadline
• filing deadline
• literally, the deadline of submission

In official or administrative Russian, this is a very common phrase.

Подачи is in the genitive singular.

That is because срок often takes a noun in the genitive to show the deadline/term for what:

• срок подачи = deadline for filing/submission
• срок оплаты = payment deadline
• срок действия = period of validity

So this pattern is very normal in Russian official language.

Сумма means amount or sum, and к возврату is an official-style expression meaning to be returned or for refund.

So сумма к возврату means:

• amount to be refunded
• refund amount
• literally, amount for return

This is common in tax, banking, billing, and other administrative contexts.

Because к + dative is a common bureaucratic/official pattern in Russian for meaning intended for, due for, or to be something.

So:

• сумма к возврату = amount to be refunded
• деньги к выплате = money to be paid out
• документы к подписанию = documents to be signed

Yes, возвращаемая сумма is grammatically possible, but it sounds less standard here. Сумма к возврату is the more typical official phrasing.

Возврату is dative singular.

That is because the preposition к normally requires the dative case:

• к возврату
• к оплате
• к рассмотрению

In this kind of formal expression, к + dative often has the sense of for, for the purpose of, or to be.

Because the subject is actually two things joined by и:

• срок подачи
• сумма к возврату

Together they form a compound subject, so the predicate must be plural.

That is why Russian says:

• указаны = are indicated / are listed

not:

• указан
• указана

If there were only one noun, the form would match that noun:

• Срок подачи указан здесь.
• Сумма к возврату указана здесь.

Указаны is the short passive participle of указать.

In this sentence it means:

• are indicated
• are specified
• are listed

This is very common in formal written Russian. Short passive participles are often used like predicates in official or neutral styles:

• Документы подготовлены. = The documents are prepared.
• Адрес указан ниже. = The address is indicated below.

So указаны здесь means are indicated here.

In Russian, the verb to be is usually omitted in the present tense.

So where English says:

• The deadline and the refund amount are indicated here

Russian simply says:

• Срок подачи и сумма к возврату указаны здесь.

There is no present-tense есть here. That would sound wrong in this sentence.

Putting здесь at the end is natural and neutral here. It gives the sentence a tidy informational flow:

1. the things being talked about
2. what is true about them
3. where

So:

• Срок подачи и сумма к возврату указаны здесь.

means roughly:

• The filing deadline and the refund amount are indicated here.

You could move здесь earlier for emphasis, for example:

• Здесь указаны срок подачи и сумма к возврату.

That also works, but it changes the focus slightly. The original sounds very normal in website or form language.

Yes, it sounds fairly formal and administrative.

Phrases like:

• срок подачи
• сумма к возврату
• указаны

are typical of:

• forms
• government websites
• tax documents
• instructions
• financial or legal information

In everyday conversation, a person might say something simpler, but in official written Russian this sentence sounds completely natural.

Yes. In this kind of context, здесь often means:

• here on this page
• here in this section
• here in this document/form

So it does not have to mean a physical location. In digital and document language, здесь is often used exactly like English here on a screen or page.