The IRS will notify you by mail if there is an audit.

Please see the following IRS website - https://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/IRS-Audits

To determine if a debt is owed and whether an offset will occur, you can contact Treasury Offset Program Call Center at (800) 304-3107. Enter the required information and it will let you know if you have any existing debt on file.

https://ttlc.intuit.com/replies/4143297