予算が足りない

Last week in class many people struggled to express the idea that there wasn't enough money in the university budget.  There were two interesting mistakes:

1. "There is not enough budget."
2. "They are running out of budget."

These mistakes demonstrate the subtle difference between "予算" and "budget": 予算 refers to an amount of money & "budget" refers to a plan for spending money.

It doesn't make sense to say, "There aren't enough plans," or "They are running out of plans," does it?

Instead, we talk about the SIZE of the budget: a big-budget item, etc. So the fix for this problem is one of the following:

1. The university budget is too small.
2. The university doesn't have enough money.

Please use English well.