kihonryoukin ga agatta ue ni, entairyoukin made aru.

The basic monthly fee went up, and on top of that there is even a late-payment fee.

Breakdown of kihonryoukin ga agatta ue ni, entairyoukin made aru.

• が: subject particle
• ある: to exist/have
• 上あがる: to go up
• まで: even

Questions & Answers about kihonryoukin ga agatta ue ni, entairyoukin made aru.

What does うえに mean here?

In this sentence, うえに means on top of that, in addition, or to make matters worse.

So:

• 基本料金が上がった = the basic fee went up
• うえに = on top of that
• 延滞料金まである = there are even late fees

A key point is that うえに often adds another point of the same general direction. Here, both points are negative from the speaker’s perspective:

• the basic fee increased
• there are even late fees

So the feeling is something like: The basic fee went up, and on top of that, there are even late fees.

Why is it 上がったうえに and not 上がるうえに?

Because うえに attaches to a plain form, and here the speaker is treating the fee increase as a completed fact:

• 上がった = went up / has increased

So 上がったうえに means it went up, and on top of that...

If you said 上がるうえに, it would sound more like a general or future statement depending on context, which is less natural here.

Compare:

• 値段が上がったうえに、量も減った。
  The price went up, and on top of that, the amount decreased.

The past form before うえに is very common when the first event/state has already happened.

Does うえに mean after here?