Tax season is a busy time of our year.
You should also keep all records about your investments, house, stocks, bonds, retirement savings, collectibles, etc. for as long as you own them plus the above limitation period. If you make tax deferred exchanges or reinvestments, you should keep records on each property starting with the first until after you dispose of the last. You may need them to determine carryover or your tax basis in your holdings. This could mean holding onto records forever. A guy walks into a bar and sits down.