To keep our financial, investment, tax, health, birthdays information and the like. We can use it for simple as well as specialized calculations. Like, comparing cost and returns of various loan, investment and insurance options available in the market.
I think it is best to keep a monthly budget instead of an annual one. This is because things change monthly. You might need to spend extra money for a holiday party in November and December, and so forth. So we are going to make a monthly budget. However, what you need to do is first consider all of your yearly bills. These are bills that you pay once a year only.