some people do it out of fear of ignorance but i believe it isn't required, for deduction to pay less tax which will send a red alert to the IRS that you're doing something illegal to steal profits from them. don't be a dork, keep quiet and report nothing! Would you tell them that you sold something for 100 bucks to your neighbor or stranger and pay a hefty taxes on something that cost you a 200 dollars? seriously, some are that stupid! if you dont have the receipt for that 200 you paid for, you are in deep !@#$ by doing so. it's too much hassle and you're accountant is going to charge you more, fvcking scam.