Budgeting did a lot of things for us - helped identify where the fat was, helped allow us to make educated saving decisions, and helped give us a lot more comfort about big, irregular expenses. Rather than getting all worked up about the big car repair, tax bill, vacation cost, or whatever, we could allocate money in the budget regularly, so that when those unexpected expenses popped up, we knew that it was already in the budget (or if not, we could tell exactly how much to adjust by). I currently find it very nice for identifying exactly how much to lump into my taxable brokerage account each month, without worrying that I might need some extra cash set aside for whatever I forgot about.