If you go over budget, it is a bad sign. It can mean you are not organized, do not plan well, or are not good with finance. So when you think of an answer, make sure you justify it with a good reason. Here is an example of what I am talking about.
This answer is admitting to going over budget, but the reason was good enough. The answer indicates that by saying how everyone was happy and making sure to say how important the project was. In the end you say you learned something. But you can change this answer a little. If you want to be more clear on the importance of the project, you can say a monetary value, like it was a two million dollar deal, and going over budget by $10,000 was acceptable by upper management.
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