If you are in the U.S. and your worked last year, there is no doubt that you have started to receive tax documents. Whether you are a freelancer or a full-time employee, everyone will have more than their share of W-2s, 1099s, etc. Keeping all organized can be a challenge, but what I have found to be useful is the Tax Organizer Binder (Orange).
I can’t begin to say how many headaches it has saved me. Now whenever, I get any tax related document , I just file it and save it. When its time to do taxes, everything is right there.