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.
Include all variable expenses now, car maintenance, electricity, heating, these can vary throughout the year you need to calculate them and come up with an average monthly amount. None essential expenses like eating out coffee at Starbucks, weekend getaways, extravagant vacations, fancy clothing, motorcycles, ATV's, if you use them, write them down, realize these are wants, not needs. Now total these all up, fixed expenses, variable expenses, and non_essential expenses,there you now have your total expenses.