The Internal Revenue Service had expected to remain open for business despite a government shutdown but has now released a contingency plan showing that up to two-thirds of its 90,000 employees will be furloughed if the government halt starts Sunday.

The IRS had hoped to remain open and funded by the $80 billion boost through the Inflation Reduction Act, but has received late guidance from the Office of Management and Budget this week that it could not cover its workers' salaries during the shutdown President Joe Biden's legislation, reports The Washington Post.

According to OMB, the legislation money can't be used to substitute for the IRS's regular budget, which is used to pay most employees' salaries. This means the backlogs will also return at the IRS, and that millions of tax refunds will not be issued to late tax filers unless they file electronically.

Further, there will be nobody working to process the payments owed by the government, and the thousands of employees who staff the agency's phones to answer taxpayer questions, including the 6,000 newly hired customer service representatives, will not be working and taxpayer assistance centers will be closed.

"Taxpayers would be completely unable to contact most IRS employees during the shutdown," according to Charles Rettig, the IRS commissioner during the Trump administration and the first years of the Biden administration.... Read More: Newsmax