Gathering your year end tax docs can be likened to keeping a tidy closet. If you replace the pants you wore on the same hanger and in the same spot you took it from, you know exactly where to find those pants the next time you wear them.
With tax docs, keep your business files in a single, organized place. Have you maintained careful records of your business mileage? Did you take a final inventory count on or before 12/31 last year?
If you've been in business for more than a year, you can generally expect that the same questions from your accountant will come up the following year. Knowing these questions ahead of time will help you better prepare for next year.