But during an IRS audit, examiners will frequently dig around through your tax return for items that did not trigger the audit.

FORBES: Audits: The IRS' Big Stick

Other possible red flags that could trigger an audit include deductions for either a home office or maintenance of a rental property.

FORBES: Audits: The IRS' Big Stick

Of those, 21% said they don't take it out of concern that using it would trigger an audit by the Internal Revenue Service.

WSJ: Easier Tax Form, Smaller Deduction

The program will rely on traveler feedback, and any discrepancies could trigger an independent audit of the hotel.

CNN: Hotel towel dilemma: Replace or reuse?

An IRS audit can be daunting and may trigger other state or local audits too.

FORBES: Careful: You Can't Renege On Settlement With IRS