If your organization sponsors a 401(k) or other retirement plan, you or someone in your organization is a fiduciary to that plan. You may have hired a service provider to administer the plan (a third party administrator, or “TPA”), but the buck stops with your organization. This is because the fine print in your TPA’s service agreement says the official “Plan Administrator” is the employer, not the TPA. This means the employer has the ultimate responsibility for the plan’s ERISA compliance.