susuryoga bissaseo oneureun chulgeumeul an haesseoyo.

Because 비싸다 (to be expensive) is describing 수수료 (fee / transaction fee), so 수수료 is the subject of that descriptive clause.

• 수수료가 비싸서 = because the fee is expensive
• Here, 가 marks what is expensive.

If you changed it to 수수료는, it would sound more like as for the fee, it’s expensive or add a contrastive nuance.

Here, -아서/어서 means because or so, connecting the first clause to the second.

• 비싸다 → 비싸서
• 수수료가 비싸서 = because the fee was expensive / since the fee is expensive

In this sentence, it gives the reason for not withdrawing.

A simple breakdown:

• 비싸다 = to be expensive
• 비싸서 = because it is expensive

은 adds a topic or contrastive nuance.

So 오늘은 often feels like:

• as for today
• today, at least
• today though...

That means the sentence can subtly imply something like:

• maybe not today, but perhaps another day
• today in particular, I didn’t withdraw

Without 은, 오늘 would just be a plain time expression. With 은, it sounds a little more framed or contrastive.

Both are possible.

출금 is a noun meaning withdrawal or cash withdrawal, and Korean often makes verbs with:

• noun + 하다

So:

• 출금하다 = to withdraw / to make a withdrawal
• 출금을 하다 = literally to do a withdrawal

That means:

• 출금을 했어요
• 출금했어요

are both understandable and natural.

Using 출금을 하다 can sometimes feel a bit more explicit because the noun is clearly shown as the object of 하다.

Because 출금 is functioning as the object of 하다.

• 출금 ends in ㅁ, which is a final consonant
• so the object particle is 을

So:

• 출금을 하다 = to do a withdrawal

This is the same pattern as:

• 공부를 하다 = to study
• 운동을 하다 = to exercise

In casual speech, the object particle is sometimes omitted, but here 출금을 is the standard full form.

안 is the short-form negation meaning not.

So:

• 하다 = to do
• 했어요 = did
• 안 했어요 = did not do

In this sentence:

• 출금을 안 했어요 = I didn’t make a withdrawal

A very common point: standard spacing is 안 했어요, not 안했어요.

There is also a longer negative form:

• 출금을 하지 않았어요

That means the same thing, but sounds a bit more formal or written.

This is an important difference.

• 안 했어요 = didn’t do it
• 못 했어요 = couldn’t do it

So in this sentence, 안 했어요 suggests a choice or decision:

• the fee was expensive, so I didn’t withdraw

If you said 못 했어요, it would sound more like:

• I was unable to withdraw
• something prevented me from doing it

Because the speaker is explaining a reason and appears to have chosen not to do it, 안 했어요 fits better.

Formally, 비싸서 comes from the present-form adjective 비싸다, but in sentences like this it often gets interpreted naturally according to context.

So:

• 수수료가 비싸서 오늘은 출금을 안 했어요 can mean
• The fee was expensive, so I didn’t withdraw today or
• The fee is expensive, so I didn’t withdraw today

In English, we often use past tense because the main action (didn’t withdraw) is in the past, but Korean does not need to mark past tense on the reason clause here.

-어요 / -아요 is the standard polite everyday speech level.

So 안 했어요 is:

• polite
• natural in normal conversation
• not especially formal
• not intimate/casual

Compare:

• 안 했어요 = polite everyday
• 안 했어 = casual
• 안 했습니다 = formal

So this sentence is appropriate in many normal situations.

Yes, Korean word order is flexible, as long as the grammatical markers stay clear.

The given sentence is very natural:

• 수수료가 비싸서 오늘은 출금을 안 했어요.

You might also hear variations like:

• 오늘은 수수료가 비싸서 출금을 안 했어요.

That puts today earlier and can make the time frame feel more prominent.

But the original order is completely natural and easy to understand:

1. reason
2. time/topic
3. action

Yes. 출금 usually means withdrawing money, especially from a bank account, ATM, or financial service.

It contrasts with:

• 입금 = deposit

So this sentence is about a money withdrawal, not just taking something out in a general sense.

If you wanted a more everyday verb for taking money out, you may also hear expressions depending on context, but 출금 is very common in banking/finance language.