House Democrats are reviving changes to individual retirement accounts containing millions of dollars as lawmakers look to finalize the taxes on the wealthy to finance President Joe Biden’s agenda.

The changes included in a draft of the House bill released Wednesday place limits on the tax-advantaged accounts and gives the Internal Revenue Service more oversight over them. The legislation, which House leaders say could get a vote as soon as Thursday, is not yet final and will likely undergo several more revisions as it moves through Congress.

The legislation would prevent contributions to traditional individual retirement accounts or Roth accounts once they reach $10 million and would require mandatory distributions for accounts that exceed that amount. The bill would also require accounts with at least $2.5 million to report their balances annually to the IRS.

The provision is prompted by concerns that wealthy Americans are using retirement accounts as powerful tax-avoidance vehicles. The most extreme example may be Peter Thiel, a billionaire who, according to a ProPublica report that cited confidential tax records, has amassed $5 billion in a Roth individual retirement account.

Despite rules that restrict contributions to retirement accounts, more than $279 billion sits in mega-IRAs, individual retirement accounts with at least $5 million each, according to Congress’s nonpartisan Joint Committee on Taxation.

Senator Ron Wyden of Oregon, the chairman of the Senate Finance Committee, said Wednesday that he found the House action on “IRA abuse” interesting.

“It seems that the House has added a provision back in,” he said. “I’ll have to see all the details.”

This article was provided by Bloomberg News.