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.
You can make utilities for yourself where you can put all your calculations and worksheets. This will reduce repetitive work to a great extent and help you save time for some other productive and constructive work. Apart from them, there are a countless number of other ways to use spreadsheet such as planning your tax, investment, cash flows, managing phone numbers and contact details and the like.