tyoukaryoukin ga deru.

It is read:

ちょうかりょうきん が でる

• 超過料金 = ちょうかりょうきん
• が = が
• 出る = でる

So the whole sentence is:

ちょうかりょうきん が でる。

超過料金 is a noun meaning excess charge, overage fee, or extra fee for going over a limit.

It is made up of:

• 超過 = excess, exceeding, going over
• 料金 = fee, charge, fare

So 超過料金 is the kind of fee you pay when you exceed some allowed amount, such as:

• going over a baggage limit
• staying too long in a parking lot
• using more data than your plan allows
• exceeding a time or usage limit

が is used because 出る is an intransitive verb.

That means the fee is being presented as something that appears / occurs / comes up, not something that someone actively does to an object.

So:

• 超過料金が出る = an extra fee comes up / is incurred
• not 超過料金を出る — that would be ungrammatical here

A useful way to think about it is:

• が marks the thing that appears or occurs
• 出る describes that appearance or occurrence

This is very natural Japanese, even though in English we often say you have to pay an extra fee or they charge an extra fee.

Yes, 出る often literally means to go out, to come out, or to appear. But in Japanese it is also used very naturally for things like:

• symptoms appearing
• results coming out
• problems arising
• expenses occurring
• fees being incurred

So with money-related words, 出る often means something like:

• to arise
• to be incurred
• to be charged
• to be required

In this sentence, 超過料金が出る means that an overage fee will occur or will be charged.

This is one of those places where Japanese uses a very general verb in a way that English usually translates more specifically.

The sentence does not explicitly say.

Japanese often leaves that kind of information unstated when it is clear from context. So 超過料金が出る just says that an extra fee will be incurred.

Depending on the situation, it could imply:

• you will have to pay an extra fee
• this service will incur an extra charge
• there will be an overage charge

The person responsible for the fee is understood from context rather than directly stated in the sentence.

It is the plain non-past form: 出る.

In Japanese, the non-past form can mean either:

• present: it comes up / it occurs
• future: it will come up / it will be charged

So in a sentence like 超過料金が出る, the exact time depends on context.

For example:

• talking about a general rule: An overage fee applies
• talking about a future consequence: An overage fee will be charged

Japanese does not force the same present-vs-future distinction that English often does.

Yes, it is a completely natural short sentence.

Japanese often uses very compact sentences, especially in:

• notices
• warnings
• instructions
• customer service language
• signs
• product descriptions

So 超過料金が出る can work as a full sentence meaning something like:

• There will be an extra charge
• An overage fee applies
• You will incur an excess fee

Even though English often prefers a fuller sentence, Japanese can sound perfectly natural with this shorter structure.

超過料金が出る is in the plain form, so it is neutral/plain in grammar.

That does not automatically mean it is rude. It can be used in:

• casual conversation
• explanatory writing
• notes
• simple statements

A more polite version would be:

超過料金が出ます。

This is what you might hear from staff, see in customer-facing explanations, or use in polite conversation.

So:

• 出る = plain
• 出ます = polite

Yes, in some contexts, but the nuance is a little different.

• 超過料金が出る focuses on the fee arising / being incurred
• 超過料金になる focuses on something ending up becoming an overage charge situation or being subject to an overage fee

For example:

• この場合、超過料金が出る。
  In this case, an overage fee will be charged.

• 30分を過ぎると超過料金になる。
  If you go past 30 minutes, it becomes subject to an overage charge.

Both can be natural, but 出る is especially common when talking about a fee appearing as a consequence.

Yes. The exact word depends on the situation.

Some related words are:

• 追加料金 = additional charge
• 延長料金 = extension fee
• 延滞料金 = late fee
• 超過料金 = overage/excess fee

They are similar, but not identical:

• 超過料金 is specifically for going over a limit
• 追加料金 is more general: any extra charge
• 延長料金 is for extending time
• 延滞料金 is for being late

So 超過料金が出る is best when the fee happens because some limit was exceeded.

Yes, very often.

Because the sentence is short and direct, it can sound like a warning or caution depending on context:

• 時間を過ぎると、超過料金が出る。
  If you go over the time limit, an extra fee will apply.

• 規定量を超えると、超過料金が出る。
  If you exceed the allowed amount, an overage fee will be charged.

So even though the grammar itself is neutral, the sentence is often used to warn someone about a consequence.

Yes, very often.

A too-literal translation would be something like:

• An overage fee comes out
• An excess fee comes out

That is not natural English.

A better natural translation depends on context:

• An extra fee will be charged
• An overage fee applies
• You’ll be charged an excess fee
• There will be an additional charge

This is a good example of why it is better to translate the meaning of the whole expression rather than each word one by one.