The units of U.S. consultancy and internal audit firm Deloitte, Deloitte Australia, New Zealand, China, Japan and Southeast Asia, are coming together to create Deloitte Asia Pacific, forming a consultancy powerhouse across the region.

According to the advisory firm, the move will allow for greater investment and focus on Deloitte's customers across the region. The five units will invest an additional $321 million over the next three years.

According to the firm, the combined entity lays an important foundation, as it places a high strategic focus on this region.

Effective in September 2018, Deloitte Asia Pacific will collectively have almost 44,500 partners and people, with the potential to create a $10 billion business by 2022.