Přeplatek je malý.

Because malý has to agree with přeplatek.

• přeplatek is a masculine singular noun
• so the adjective also takes the masculine singular nominative form: malý

Very roughly:

• masculine singular: malý
• feminine singular: malá
• neuter singular: malé

So Přeplatek je malý is grammatically matched.

Přeplatek is masculine inanimate.

A few helpful points:

• Nouns ending in a consonant are often masculine in Czech.
• přeplatek refers to a thing, not a person or animal, so it is inanimate.
• In this sentence, that is why the adjective appears as malý.

It is in the nominative case because it is the subject of the sentence.

So the structure is:

• Přeplatek = subject, nominative
• je = is
• malý = predicate adjective, also in nominative agreement with the subject

In sentences with být (to be), the adjective after the verb normally agrees with the subject.

Je is the 3rd person singular present tense of být (to be).

So:

• já jsem = I am
• ty jsi = you are
• on/ona/ono je = he/she/it is

In Přeplatek je malý, je means is.

In normal standard Czech, no: you usually keep je in this kind of sentence.

So the standard sentence is:

• Přeplatek je malý.

Leaving out je would sound incomplete in ordinary speech. You may sometimes see omission in headlines, notes, or very compressed styles, but not as the normal full sentence.

That is a very common question.

Czech adjectives usually come before a noun when they are directly describing it inside a noun phrase:

• malý přeplatek = a small overpayment

But in your sentence, malý is not directly attached to the noun as part of one noun phrase. It comes after je and functions as a predicate adjective:

• Přeplatek je malý. = The overpayment is small.

So:

• malý přeplatek = small overpayment
• přeplatek je malý = the overpayment is small

No. Czech does not use articles like English a and the.

So Přeplatek je malý can be understood as:

• The overpayment is small
• or sometimes An overpayment is small

In real use, context tells you which interpretation is intended. Very often, English translations use the even though Czech has no separate word for it.

A simple pronunciation guide:

• Přeplatek: stress on the first syllable: PŘE-pla-tek
• je: roughly ye
• malý: stress on the first syllable: MA-lý

A few key pronunciation points:

• Czech stress is usually on the first syllable
• ý is a long vowel
• ř in přeplatek is a special Czech sound; English does not have an exact equivalent. Learners often approximate it at first, and that is normal.

So the rhythm is roughly:

PŘEplatek je MAlý

Yes, Czech word order is flexible, but the neutral order here is:

• Přeplatek je malý.

That is the most natural basic statement.

Other word orders are possible, but they change emphasis:

• Malý je přeplatek. = marked or poetic/emphatic
• Je přeplatek malý? = Is the overpayment small?

So for a beginner, Přeplatek je malý is the best normal pattern to learn.

It can refer to more than physical size.

With something like přeplatek, malý usually means the amount is small / low / minor, not that it has small physical dimensions.

So Czech uses malý in a broad way, much like English small can refer to:

• size
• amount
• degree
• importance

Here it refers to the size of the overpayment as an amount.