ИНН и НДФЛ указаны здесь.

and

Breakdown of ИНН и НДФЛ указаны здесь.

• здесь: here
• указать: to indicate
• ИНН: the taxpayer identification number (TIN)

Questions & Answers about ИНН и НДФЛ указаны здесь.

What do ИНН and НДФЛ stand for?

These are common Russian abbreviations, especially in tax and document-related contexts:

• ИНН = Идентификационный номер налогоплательщика
  This is the taxpayer identification number.

• НДФЛ = Налог на доходы физических лиц
  This is personal income tax.

In real Russian, abbreviations like these are used very often, especially on forms, websites, and official documents.

Why is указаны plural?

Because the sentence has two things as its subject:

• ИНН
• НДФЛ

Together they form a plural subject, so the predicate is plural too.

That is why Russian uses:

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

So ИНН и НДФЛ указаны здесь literally means something like The INN and the NDFL are indicated here.

What kind of word is указаны?

Указаны is the short passive participle of указать.

In practical terms, learners can think of it as a form often used like are indicated / are specified / are listed.

Compare:

• указать = to indicate, specify
• указан / указана / указано / указаны = indicated, specified, listed

This short form is very common in formal, written, and official Russian.