Your retirement plan may have an outside third party administrator (TPA) to assist with plan administration. However, a TPA typically is not a fiduciary to the plan and does not act as “plan administrator” (that’s usually the employer itself as provided in a typical TPA services agreement). This leaves the employer ultimately responsible for the plan’s compliance with all applicable legal requirements. So, even if your TPA makes a mistake, the employer is likely on the hook for any resulting liability because the TPA’s services agreement usually imposes damage limits and employer indemnities that protect the TPA.