Another consideration, if the client is in a state that requires withholding, using the EIN of the employer it can cause tremendous issues. We had a CA client that was audited by the state and it a mess trying to unwind the Plan's withholdings from the Employers obligations. The state was completely unreasonable through this process and fines/penalties were stacking up quarterly. It was a mess. It is easy enough to get a TIN for the Plan so we do for every plan that is not on a recordkeeping platform.