Audits
IRS employees conducting audits may call taxpayers to set up appointments or to discuss items with the taxpayers, but not without having first attempted to notify them by mail. After mailing an official notification of an audit, an auditor/tax examiner may call to discuss items pertaining to the audit.
https://www.irs.gov/newsroom/how-to-know-its-really-the-irs-calling-or-knocking-on-your-door
종이에 프린트된 메일을 받으셨나요?