There are at least a couple major problems with this method. First, it's pretty easy to overlook quite a few expenses. Things like that daily stop at the coffee shop, or the cost of a car registration that happens only once a year.
Budgeting is not an easy task, especially when you do not have enough money to budget in the very first place. A lot of families and individuals are actually facing a grave problem of how they will be able to make both ends meet, especially now when the prices of almost everything are skyrocketing. Good thing there are now plenty of tools that will be able to help you out in budgeting, a task that can be frustrating, depressing and tedious all at the same time.