The US Internal Revenue Service and Security Summit partners urged tax professionals and taxpayers to enable multi-factor authentication (MFA) in their tax preparation software products to defend against data theft. The IRS also reminded tax pros to be aware of phishing attacks used by cybercriminals to take control of their accounts and/or computers, as well as infect their systems with malware that would open the door for further data theft attacks. Microsoft and Google also advised users to add recovery phone numbers to their account and to enable SMS-based MFA to boost their security.
Source: https://www.bleepingcomputer.com/news/security/irs-urges-taxpayers-to-enable-multi-factor-authentication/