We live in a no-income tax state. We don't spend a lot of money, so that the IRS calculation gives us more of a deduction than saving receipts. However, if you buy a car, boat, or other big ticket item, keep that receipt. <--- I am not sure about the tax laws on this anymore, but I think you will not need to keep all those receipts nor add them up if you do unless you love to spend more than the average citizen with your income which would be hard to believe of anybody who takes the trouble to post a question on this forum.
It's all about short-term opportunistic rebalancing due to a short-term change in one's asset allocation, uh, I mean opportunistic rebalancing, uh I mean rebalancing, uh I mean market timing.