A list of your income and expenses, no matter how complete, is not a spending plan, but is the information you need to create a spending plan. And, a paycheck_by_paycheck spending plan will help ensure the success of, or at least help prevent the failure of your budget.
What are the other reasons why you need to use a budget template? First, you will be able to know the current situation of your status in numeric terms using best budget software/budget template. You will be able to check if your income is actually covering your expenses and as well as your other liabilities. These are the factors that determine the present results and positions of your finances. And with this, you will be able to easily predict what might happen in the near future or you can also start setting your goals depending on the results in the present.