The plan sponsor for a law firm 401k plan is set up as an LLC taxed as a partnership - equally owned (1/3) by three different Affiliated/Participating employers all taxed as an S-corp. The LLC employees a few non-owners, and each of the 3 S-corp partners are 100% owners of his or her respective firm.
Since the three affiliated, participating employers (S-Corps) pay their owners W-2 compensation, the W-2 compensations are eligible for deferrals and contributions for the plan. For Pre-tax deferral contributions, payroll deductions are withheld for the owners (W-2 comp) and funded by the individual S-corp. It's a Safe Harbor match plan with a Plan Year/annual determination period for the match.
Since the pre-tax deferral contribution will be deducted via payroll and funded from the owners' individual S-corp, does the corresponding Safe Harbor match need to also be funded from the individual S-corp. - or does the match need to be funded by the LLC taxed as a partnership?