I want to make sure that I understand the ACP test correctly. Example:
Safe Harbor Plan - 3% non-elective
No matching contribution
After-tax contributions are allowed
If the NHCE ACP is 0%, then no HCE can make an after-tax contribution.
If the NHCE ACP is 2-8%, HCEs can make after-tax contributions of the NHCE average plus 2%
If the NHCE ACP is above 8%, HCEs can make after-tax contributions of the NHCE average x 1.25
If so, it sounds like the sponsor would need to add some form of a matching contribution (possibly only to NHCEs) if they want to offer the ability to make after-tax contributions.