私はお金不足だ。

I have a shortage of money.

English Translation

I’m short of money.

Are there general rules when 不 is pronounced ふ vs. ぶ?

@ericaw
First off, お金不足だ sounds unnatural. We usually say 私は金欠だ(わたしはきんけつだ)or 私にはお金がない.
There is not particle such as が, を, and は between a noun and 不足. If so, we pronounce 不足 as ぶそく (BUsoku) instead of ふそく (FUsoku). It’s just a matter of liaison. If you replace the original sentence with 私にはお金が不足している, it should be pronounced as おかね が FUそくしている.

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