Financial statements are usually sent on a monthly or quarterly basis. When these arrive, file them in a corresponding file folder. Once you receive the year end statement verify that that year end statement matches the information provided on the monthly and quarterly statements. If yes, you may consider tossing out the monthly and quarterly statements and keep only the year-end statements. However, if tossing them out is not advised by your accountant you may simply attach them to the year end statement so all your statements are maintained together and ready for tax time.