I got audited a few years back. I claimed something that set off a red flag--deducted tuition for a grad program as a business expense.

I freaked out at first because I thought I must have messed something up or that they knew I messed something up.

What I discovered is that: at the end of the day these folks are probably just as annoyed as you that they got another "audit" in their pile. And being flagged doesn't mean you are wrong. It means they need more information before they can decide.

I wrote a detailed response with the actual flow chart from their own guidance, I circled the decisions on the chart, and then provided proof of each decision in my letter. Basically I held their hand and showed them I could legit deduct it.

They were like "oh, cool thanks! You're good. Actually, you could have itemized x if you have receipts for it and you'd get a bigg r deduction if you wanted to amend"

That's when I realized they don't really check everyone's taxes at all. They have a system that flags certain situations for further review. I guess, in my case, people lie or mess up this tuition deduction a lot so they double check.