The IRS is revamping the top of its organizational structure for the first time in two decades, the agency announced Wednesday.

The changes include a rollback to one deputy IRS commissioner, instead of two, and four new chief positions that will oversee taxpayer service, tax compliance, information technology, and operations. They will go into effect early 2024.

Restructuring was a part of the IRS’ strategic operating planreleased last year. The plan details how the agency will spend its new tens of billions of funds from the Inflation Reduction Act or tax-and-climate law.

“The entire landscape around tax administration – including the economy, tax laws and technology — have undergone major changes since the last IRS reorganization,” IRS Commissioner Danny Werfel said in the press release. “The new structure will help the top leadership to work together to drive faster and more effective progress. It’s critical we deliver for taxpayers and the nation as we work to make important improvements at the IRS.”

The new IRS deputy commissioner role will be filled by Doug O’Donnell, who is currently the deputy commissioner for services and enforcement. He will oversee IRS Online Services as well as officials who will serve in four new IRS chief positions: Ken Corbin, chief of taxpayer service, Heather Maloy, chief taxpayer compliance officer, Rajiv Uppal, chief information officer, and Melanie Krause, chief operating officer.