Mistake _ Not Planning for Upcoming Expenses _ When you are creating a monthly budget it is always helpful to save a certain amount of money for a given category even if you don't have that expense for the given month. For example, let's say you pay your car insurance every six month. It is important to take your payment and divide it by six. Then, each month you will want to save that amount so you have the insurance payment when it comes due instead of trying to come up with the whole amount in one given month. If you can do this for as many periodic expenses as possible, it will be easier to have a balanced budget each month.
Now we have reached the make adjustments phase, subtract your expenses from your income and if you have some money left over at the end of the month you have got yourself a budget. Realistically most people will not have a workable budget at this point, again it's not really your fault if you don't have a budget, because nobody ever took the time to show you how to set up a budget, much less help you stay on a budget. It doesn't take a rocket scientist at this point to figure out that you should reduce your nonessential spending habits and that's what they usually are is habits, they are your wants, not your needs. Pare your expenses down so you have some money left over at the end of the month and you now have your first monthly budget.