Look, they're probably not interested or... don't believe your deductions. What they're looking for is items that you didn't put down on the form. Mainly, unreported income.
10 seconds sound clip from The Honeymooners (1955) - The Worry Wart sitcom.
You can hear this line at 00:16:09.173 in the Blu-ray version of the TV Series.
Quote context
[...]
- Yeah. That's all, they're all legitimate.
- Business reasons? You work in a sewer.
- What possible business could you conduct... could you possibly write off in your apartment?
- You practice in the bathtub, and they're investigating my taxes.
- What do you mean, unreported income? I only work for the bus company. I don't have any other jobs.
- Well, little other things that you forget to put down. You know, like...
[...]