According to the 2024-25 unaudited accounts, Shoaf was paid £207,000 at the time, as well as £20,000 in pension contributions.
The WMCA Board is expected to approve the increase on 16 January.
Its report said: “This approach enables WMCA to maintain parity with peer organisations, attract and retain high calibre leadership talent, and uphold our reputation as a high performing and forward-thinking employer.
“In an ambitious, trailblazing Combined Authority, where strategic leadership is critical to delivering complex regional priorities, it is essential that our reward framework reflects both market conditions and the value of senior roles.”