how far out in advance do you plan your budget, and in how much detail? We have two levels of planning here – the monthly budget, which we use as our general indicator of what can be spent. And then I work a weekly cash flow spreadsheet each Friday, for the week to come. That cash flow is a lot more specific. For instance, I’ll allocate X amount in the budget for monthly spending at the grocery, but I’ll figure out how many cups of yogurt, how many trays of drumsticks, etc, I’m going to get that week and at what price.