If you carry a credit card balance, the minimum payment is a "need" and it counts toward the 50 percent. Anything extra is an additional debt repayment, which goes toward this 20 percent category. If you carry a mortgage or a car loan, the minimum payment is a "need" and any extra payments count toward "savings and debt repayment."
How to use your monthly budget worksheet. Below is a worksheet that attempts to list possible sources of monthly income as well as expenses. As everyone's financial situation is different, you may find that not every category is applicable to your income or spending. You may even find that some months are different than others, but you should find through going through this exercise you are better prepared for those changes and even accounting for unanticipated expenses.