Претензия требует перерасчёта.

Because претензия is the subject of the sentence — it is the thing that requires something.

• Претензия = the claim / complaint
• требует = requires / demands
• перерасчёта = recalculation

So grammatically, the structure is:

[Subject] + [verb] + [object/complement]

That is why претензия stays in the nominative singular.

Because the verb требовать normally takes the genitive case.

So:

• перерасчёт = nominative dictionary form
• перерасчёта = genitive singular

This is a very common pattern in Russian:

• требовать помощи = to require help
• требовать объяснений = to demand explanations
• требовать перерасчёта = to require recalculation

For an English speaker, this can feel unusual because English would normally use a direct object with no case change, but in Russian the verb controls the case.

It is genitive singular.

The noun is:

• перерасчёт = recalculation

Its singular forms are:

• nominative: перерасчёт
• genitive: перерасчёта

Here it appears in the genitive because of требует.

It can be translated either way, depending on context.

In this sentence, требует often means something like:

• requires
• calls for
• necessitates
• sometimes demands

With претензия, the whole sentence sounds fairly formal or bureaucratic. In many contexts, The claim requires recalculation or The complaint calls for a recalculation is more natural than a very literal demands.

So yes, требовать can be strong, but in administrative language it often simply means that some further action is necessary.

Not always exactly. Претензия is a formal word and often means:

• a claim
• a formal complaint
• a demand
• a grievance in a legal or business context

It is more formal and more specific than everyday жалоба.

A rough comparison:

• жалоба = complaint, grievance, often general or personal
• претензия = formal claim/complaint, often business, legal, or administrative

So in a customer-service, legal, billing, or contractual context, претензия is very common.

Yes, it sounds quite formal, administrative, or legal.

Words like претензия and перерасчёт are typical of:

• official letters
• billing disputes
• customer-service paperwork
• legal or quasi-legal language
• housing/utilities/accounting contexts

In everyday conversation, a speaker might say something less formal depending on the situation.

Russian has no articles, so nouns do not automatically show a/an/the.

Претензия требует перерасчёта could mean:

• The claim requires recalculation
• A claim requires recalculation
• The complaint calls for a recalculation

Which one is intended depends on context.

English speakers often want a one-to-one match for the or a, but Russian simply does not mark that grammatically.

Yes, Russian word order is flexible, though the neutral order here is very natural:

• Претензия требует перерасчёта.

You could also see variations like:

• Перерасчёта требует претензия.

That version puts stronger focus on перерасчёта or sounds more marked/stylistic.

Because Russian uses case endings, word order can change without making the sentence ungrammatical, but the emphasis changes. For a learner, the given order is the safest and most neutral one.

The infinitive is требовать = to require / to demand.

требует is:

• 3rd person singular
• present tense

So it means:

• he/she/it requires
• in this sentence: it requires, because претензия is singular

Conjugation:

• я требую
• ты требуешь
• он / она / оно требует
• мы требуем
• вы требуете
• они требуют

Требовать is imperfective.

In this sentence, that is normal because Russian commonly uses the imperfective in the present tense for general statements:

• Претензия требует перерасчёта. = The claim requires recalculation.

If you wanted a perfective partner, a common one is потребовать, but that would usually describe a completed or single demand/request in a specific event, not this neutral present statement.

The stress is:

• прете́нзия
• тре́бует
• перерасчёта

So roughly:

prye-TEN-zee-ya TRYE-boo-yet pye-re-ra-SHCHO-ta

A few notes:

• е after a soft consonant often sounds roughly like ye
• ё in перерасчёта is always stressed and pronounced yo
• щ sounds like a long soft sh sound

If you say the stress correctly, the sentence will sound much more natural.

In standard Russian, no — after требовать, you normally need the genitive:

• correct: требует перерасчёта
• not standard here: требует перерасчёт

So this is not just a stylistic choice; it is part of the verb’s usual grammar.

Перерасчёт usually means a recalculation or adjustment after reviewing numbers. Common contexts include:

• utility bills
• rent or housing charges
• salaries or payments
• taxes
• service fees
• insurance or accounting calculations

So Претензия требует перерасчёта might appear in a situation where someone has challenged a bill or charge, and the complaint means the amount must be recalculated.