Saldo dostępne jest niskie.

The sentence breaks down like this:

• saldo dostępne = available balance
• jest = is
• niskie = low

So the structure is:

[subject] + [verb] + [predicate adjective]

More literally: The available balance is low.

A useful way to see it is that dostępne belongs to saldo, while niskie describes the whole subject through jest.

That is a very natural question. In everyday Polish, adjectives often do come before the noun, for example:

• duży dom = a big house
• wysokie saldo = a high balance

But saldo dostępne is common in banking and interface language as a fixed or semi-fixed term, like a label. In that kind of technical or administrative style, putting the adjective after the noun is more acceptable.

So:

• saldo dostępne sounds like a banking term
• dostępne saldo is also grammatical, but it may sound less like the standard label used by banks

Because they agree with saldo.

Saldo is singular neuter here, so adjectives describing it must also be singular neuter in the nominative.

That gives:

• dostępne saldo
• saldo jest niskie

Compare with other genders:

• rachunek jest niski — masculine would be niski
• kwota jest niska — feminine would be niska
• saldo jest niskie — neuter is niskie

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

Since saldo dostępne is the thing being described, it appears in the nominative, and the agreeing adjectives also match that case.

So all of these are nominative singular neuter:

• saldo
• dostępne
• niskie

Jest is the 3rd person singular present tense of być = to be.

It links the subject with the description:

• Saldo dostępne jest niskie = The available balance is low

This is the normal Polish equivalent of English is in this kind of sentence.

In a normal full sentence, no — you should keep it.

So:

• Saldo dostępne jest niskie = correct full sentence

Without jest:

• Saldo dostępne niskie = not a normal standard sentence

You might sometimes see verb omission in headlines, notes, or interface shortcuts, but for standard Polish sentence building, jest is needed here.

Yes, it is understandable and quite plausible, especially in a banking context.

That said, many speakers might also say:

• Dostępne saldo jest niskie
• Saldo jest niskie if the context already makes clear which balance is meant

The original version sounds a bit formal or interface-like, which fits banking language well.

Yes, very often it does.

In banking Polish, saldo dostępne is commonly understood as a set expression meaning available balance. It behaves almost like a fixed label, similar to how an app or bank website might name a field.

That is why the sentence feels more natural than a random noun + postposed adjective combination might.

Because Polish has no articles like a or the.

Whether something is understood as a balance, the balance, or your balance depends on context.

So saldo dostępne can mean:

• the available balance
• an available balance
• your available balance

In real usage, the situation usually makes it clear.

You could, but niskie saldo is more idiomatic in this context.

In financial language, Polish often uses niski / wysoki for amounts, levels, balances, and prices:

• niskie saldo = low balance
• wysokie saldo = high balance

Małe saldo is understandable, but it sounds less standard than niskie saldo.

Both are grammatical, but they can sound slightly different in style.

• dostępne saldo sounds more like ordinary adjective + noun word order
• saldo dostępne sounds more like a banking term or label

So in a financial interface, saldo dostępne is very natural. In more general prose, some speakers might prefer dostępne saldo.