In keeping the receipts

Every time my love will buy some office supplies, I will be asking for a receipt. At first, he’s asking of what I will be doing with it. So, I told him that I could possibly use it for my tax the following year because I am using those office supplies as part of my home-office business. After telling him about it, he then understands the use of keeping the receipt be it for tax purposes, or for any other use.