The envelope budgeting system is straightforward. You use cash to control your spending, and when you're out of cash, you stop spending. To set up an envelope system, you'll need to know how much you have available after paying your fixed expenses such as rent, car payments, or insurance. Once you know how much money you have left, decide how best to allocate it between the different budget categories you spend the most. Common categories include groceries, gas money, dining out and entertainment, clothing, etc. Once you've allocated amounts, get an envelope for each category and place the appropriate amount of cash inside of each. The hard part is that as the month progresses and you're emptying an envelope, you stop spending in that category once you run out of cash. You've hit your budget limit until the next pay period.