お金

How it works

が (subject) marks the subject — the thing there isn't enough of, here お金おかね (money). The verb 足りるたりる (be enough) shifts to its plain negative 足りないたりない (not enough), so this is casual, with no polite です (is) or ます (polite) at the end. Literally it says “money isn't enough” rather than “I don't have enough money”.