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Weekly budgets based on (a variable) monthly budget
I think the real problem here is dealing with the variable income. The envelope solution suggests the problem is that your brother doesn't have the discipline to avoid spending all his money immediately, but maybe that's not it. Maybe he could regulate his expenses just fine, but with such a variable income, he can't settle into a "normal" spending pattern. Without any savings, any budget would have to be based on the worst possible income for a month. This isn't a great: it means a poor quality of life. And what do you do with the extra money in the better-than-worst months? While it's easy to say "plan for the worst, then when it's better, save that money", that's just not going to happen. No one will want to live at their worst-case standard of living all the time. Someone would have to be a real miser to have the discipline to not use that extra money for something. You can say to save it for emergencies or unexpected events, but there's always a way to rationalize spending it. "I'm a musician, so this new guitar is a necessary business expense!" Or maybe the car is broken. Surely this is a necessary expense! But, do you buy a $1000 car or a $20000 car? There's always a way to rationalize what's necessary, but it doesn't change financial reality. With a highly variable income, he will need some cash saved up to fill in the bad months, which is replenished in the good months. For success, you need a reasonable plan for making that happen: one that includes provisions for spending it other than "please try not to spend it". I would suggest tracking income accurately for several months. Then you will have a real number (not a guess) of what an average month is. Then, you can budget on that. You will also have real numbers that allow you to calculate how long the bad stretches are, and thus determine how much cash reserve is necessary to make the odds of going broke in a bad period unlikely. Having that, you can make a budget based on average income, which should have some allowance for enjoying life. Of course initially the cash reserve doesn't exist, but knowing exactly what will happen when it does provides a good motivation for building the reserve rather than spending it today. Knowing that the budget includes rules for spending the reserves reduces the incentive to cheat. Of course, the eventual budget should also include provisions for long term savings for retirement, medical expenses, car maintenance, etc. You can do the envelope thing if that's helpful. The point here is to solve the problem of the variable income, so you can have an average income that doesn't result in a budget that delivers a soul crushing decrease in quality of living.