what are the ways to cheat on your taxes?
all the documents and numbers you enter are verifiable by the IRS right?
Some things aren't.
There are criteria for qualifying for a home office tax deduction. You can lie and say you qualify when you don't. That wouldn't be caught without an audit.
I believe charitable contributions under a certain amount don't require a receipt (not sure if that's an aggregate total or a total per donation).
Gambling winnings in any amount are taxable (and can be offset by gambling losses). Gambling winnings are only reported under certain circumstances. If they aren't reported by the casino, most people won't report them.
Pretty much no one pays use tax unless they own a business.
There are many ways to cheat on your taxes.