The purpose of closing the books is to make sure that all the financial information about your business is accurate and entered properly.
In addition to checking the data accuracy and closing the books, you should think about and plan for the up-coming year. Be sure your tax objective is aligned with your business goals.
Closing the books means you are ending your official accounting period so you can start the next period with a clean slate. It means that once the books are “closed” there will be no more changes to the financial documents for the closed period. So accuracy is critical. The closed books are the “gospel” of what has happened in the financials for your company.