The SnapBOI platform allows professionals to insert their own engagement letter - by using Engagement Letter functionality - and may access a sample engagement below*.
CPAs who hold membership with the AICPA may also obtain a sample BOI Engagement Letter on the AICPA's website: BOI Reporting Services Engagement Letter | Resources | AICPA & CIMA (aicpa-cima.com)
*It is recommended that your organization's engagement letter be reviewed by legal counsel prior to use - SnapBOI does not provide legal advice.