The IRS continues to warn tax preparers regarding dangers of phishing scams & to have an overall plan in place as noted below

https://www.us-cert.gov/ncas/current-activity/2019/08/01/irs-reminds-tax-professionals-beware-phishing-emails

The Internal Revenue Service (IRS) has issued a news release warning tax professionals of the continued threat of phishing emails. Phishing emails are one of the most common ways cyber criminals steal sensitive data. Educating personnel on the risks posed by phishing emails is part of the Taxes. Security. Together. Checklist, which IRS created to help tax professionals protect sensitive taxpayer data.   The Cybersecurity and Infrastructure Security Agency (CISA) encourages tax professionals to review the IRS news release and the CISA Tip on Avoiding Social Engineering and Phishing Attacks for more information.