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."
Once you have a list of your expenses and your income, you will need to compare the two numbers. Your expenses should less than or equal to your income. If you have additional money after you plan your budget, you can add it to the categories for your financial goals like getting out of debt or building an emergency fund. If you have more expenses than income, you will need to find ways to cut back on your expenses. Start by cutting money from your categories in the luxury section of your budget. You can also work on ways to increase the amount you earn.