The letter to IRS Commissioner Charles Rettig comes amid attacks from Republicans that the $80 billion the Inflation Reduction Act would give to the IRS over the next 10 years would result in more middle-class Americans and small businesses getting audited. The Biden administration has repeatedly said the IRS would focus on increased enforcement activity on high-wealth taxpayers and large corporations and not target households who earn less than $400,000 a year.

“Specifically, I direct that any additional resources—including any new personnel or auditors that are hired—shall not be used to increase the share of small business or households below the $400,000 threshold that are audited relative to historical levels,” Yellen wrote in the letter to Rettig. “This means that, contrary to the misinformation from opponents of this legislation, small business or households earning $400,000 per year or less will not see an increase in the chances that they are audited.”

Enforcement resources, Yellen said, will instead “focus on high-end noncompliance.”