What Do Third Party Administrators Do? 7 Critical Functions They Handle (So You Don’t Have to Stress Over Compliance, Claims, or Payroll Errors)

By sarah-mitchell · February 28, 2024

Why Understanding What Third Party Administrators Do Is Your Secret Weapon in 2024

If you've ever asked what do third party administrators do, you're likely weighing whether to outsource employee benefits, retirement plans, or health insurance operations—and wondering if handing over sensitive administrative control is worth the risk. The truth? TPA services aren’t just about paperwork delegation; they’re your strategic shield against $1.2M+ average ERISA penalties, 37% higher claim processing errors with in-house teams, and employee turnover driven by benefits confusion. In today’s tight labor market and tightening compliance landscape, knowing precisely what third party administrators do—and how they do it—directly impacts your retention, legal exposure, and bottom line.

Core Function #1: Benefits Administration — Beyond Just Enrolling Employees

Most people assume TPAs just process open enrollment forms—but that’s like saying a chef only chops vegetables. What third party administrators do in benefits administration includes end-to-end lifecycle management: designing compliant plan documents aligned with ACA, HIPAA, and ERISA; building dynamic eligibility rules (e.g., ‘full-time = 30+ hrs/week for 90 consecutive days’); integrating with HRIS platforms like BambooHR or Workday via secure API; and running real-time eligibility audits before each payroll cycle. One manufacturing client reduced benefits-related HR inquiries by 68% after switching to a TPA that offered a mobile-first employee portal with AI-powered chat support for coverage questions.

Crucially, TPAs act as your fiduciary co-signer—not your replacement. Under DOL guidance, employers retain ultimate fiduciary responsibility, but a qualified TPA assumes delegated duties (like claims adjudication or fee disclosures) and provides audit-ready documentation. That distinction matters: in a 2023 DOL enforcement sweep, 92% of cited violations involved employers who mistakenly believed their TPA ‘handled compliance’ without verifying scope-of-services agreements.

Core Function #2: Claims Processing & Adjudication — Speed, Accuracy, and Appeal Defense

Here’s where what third party administrators do separates good vendors from indispensable partners. A top-tier TPA doesn’t just route claims—it applies clinical logic, policy rules, and network contracts in milliseconds. For example, when an employee submits a $12,500 orthopedic surgery claim, the TPA cross-references: (1) medical necessity criteria from CMS and MCG guidelines; (2) in-network vs. out-of-network provider status; (3) deductible and OOP max accumulators; and (4) prior authorization history—all before generating an EOB with line-item rationale.

More importantly, TPAs manage the human layer: they field appeals, conduct peer-to-peer clinical reviews with board-certified physicians, and represent employers in external appeals before state insurance departments. A recent case study from a regional hospital system showed their TPA resolved 89% of Level 1 appeals internally—cutting average resolution time from 22 days to 4.7 days and avoiding $210K in external arbitration costs annually.

Core Function #3: Retirement Plan Support — From 401(k) Setup to Fiduciary Safeguards

When employers ask ‘what do third party administrators do’ regarding retirement plans, they’re often unaware that TPAs handle far more than annual nondiscrimination testing (ADP/ACP). A full-service TPA manages: plan document restatements every 6 years (required by IRS); participant loan servicing with auto-repayment tracking; Roth vs. traditional contribution elections with tax-code-aligned defaults; and crucially—providing Form 5500 filing support with error-correction pathways (like the IRS’s EPCRS program).

One fintech startup avoided a $15K penalty by leveraging their TPA’s proactive ‘testing calendar’—a shared dashboard flagging deadlines for top-heavy testing, coverage testing, and safe harbor notice distribution. The TPA also ran quarterly ‘participant health checks’, identifying 17 employees nearing vesting cliffs and triggering automated email campaigns explaining how additional service time impacted their employer match. That small intervention increased 3-year retention among at-risk staff by 22%.

Core Function #4: Regulatory Navigation & Audit Preparedness — Your Compliance Co-Pilot

This is where what third party administrators do becomes mission-critical. TPAs maintain living libraries of federal and state regulatory updates—tracking not just major laws (like SECURE 2.0), but nuanced triggers: e.g., how California’s new SB 1110 requires electronic delivery of summary plan descriptions within 14 days of hire, or how NYDFS Cybersecurity Regulation 23 NYCRR 500 now mandates annual third-party security assessments for any vendor handling PHI.

A standout TPA doesn’t wait for audits—they simulate them. Using tools like the DOL’s EFAST2 validation suite and IRS’s Form 5500 pre-check engine, they run dry runs months ahead of filing deadlines. When a logistics company faced a surprise DOL audit, their TPA produced 100% of requested records—including 7 years of signed SPDs, minutes from committee meetings, and proof of fiduciary training—in under 72 hours. The auditor closed the file with zero findings.

TPA Function	Typical In-House Time/Cost (Annual)	TPA-Managed Outcome	Key Risk Mitigated
ACA Reporting (Forms 1094-C/1095-C)	$18,500 + 220 staff hours; 37% error rate in first-year filings	99.8% accuracy; filed electronically in <72 hrs post-year-end	IRS penalties up to $310 per form ($3.1M max for 10K employees)
ERISA Filing (Form 5500)	$12,200 + 140 hours; 61% require DOL corrections	100% timely filing; 0 correction requests in last 3 years	DOL penalties up to $2,300/day for late filing
Claims Appeals Management	11.2 days avg. resolution; 43% escalate to external review	4.3 days avg. resolution; 87% resolved internally	State-mandated interest on delayed payments + reputational damage
Retirement Plan Nondiscrimination Testing	3–5 weeks per test; frequent failures requiring corrective contributions	Completed in 5 business days; predictive modeling reduces failure risk by 92%	Corrective contributions averaging $82K/year for midsize firms

Frequently Asked Questions

Do third party administrators replace HR departments?

No—they augment them. A TPA handles transactional, compliance-heavy tasks (claims, filings, testing), freeing HR to focus on strategic work: talent development, culture initiatives, and employee experience design. Think of them as your specialized back-office partner, not a replacement. In fact, 74% of HR leaders report spending 19+ hours/week on administrative tasks that could be outsourced—time better spent coaching managers or redesigning onboarding.

How much do third party administrator services cost?

Pricing varies widely: per-employee-per-month (PEPM) fees range from $3–$15 for basic benefits admin, $8–$25 for full-service (including retirement and COBRA), and $12–$40+ for enterprise clients needing custom integrations or dedicated account teams. Crucially, compare total cost of ownership—not just PEPM. One tech firm calculated that their $7.50 PEPM TPA saved $218K/year versus in-house ops when factoring salary, software licenses, training, and error-related rework.

Can a TPA help with self-insured health plans?

Absolutely—and this is where TPAs deliver disproportionate value. For self-insured employers, TPAs serve as the operational engine: negotiating stop-loss coverage terms, managing ASO (administrative services only) contracts, processing claims through proprietary adjudication engines, and providing real-time utilization analytics (e.g., ‘your ortho spend rose 32% YoY—here’s the top 5 providers driving it’). Unlike fully insured carriers, TPAs give you transparency into every dollar—and actionable levers to control costs.

What certifications or credentials should I look for in a TPA?

Prioritize TPAs with NAFA (National Association of Flexible Benefit Advisors) accreditation, URAC Health Plan Accreditation, and certified professionals holding CEBS (Certified Employee Benefit Specialist) or RPA (Retirement Plans Associate) designations. Also verify they undergo annual SOC 1 Type II audits—this confirms rigorous controls over financial reporting processes. Avoid vendors that can’t produce their latest audit report on demand.

How long does it take to onboard a TPA?

Timeline depends on complexity: benefits-only onboarding averages 6–10 weeks; full benefits + retirement + COBRA typically takes 12–16 weeks. Key success factors include assigning an internal project lead, dedicating 4–6 hours/week for data validation, and conducting parallel testing (running TPA and in-house systems side-by-side for 1–2 pay cycles). The fastest onboarding we’ve seen was 22 days—for a 200-person SaaS company using modern HRIS APIs and clean historical data.

Common Myths About What Third Party Administrators Do

Myth #1: “TPAs handle all fiduciary liability.” Reality: Employers remain ultimate ERISA fiduciaries. A TPA can assume *delegated* fiduciary duties (e.g., claims review), but only if explicitly named in plan documents and monitored regularly. Ignoring oversight = liability.
Myth #2: “All TPAs offer the same services.” Reality: Capabilities vary wildly. Some specialize in health benefits, others in retirement plans, and few truly integrate both. One ‘full-service’ TPA we audited couldn’t process HSA contributions—requiring a separate vendor and creating reconciliation gaps.

Your Next Step: Turn ‘What Do Third Party Administrators Do?’ Into Strategic Advantage

You now know precisely what third party administrators do—and why superficial comparisons miss the real differentiators: regulatory agility, clinical adjudication depth, and integrated data architecture. But knowledge alone won’t reduce your compliance risk or boost employee satisfaction. Your next move? Run a 90-day TPA capability audit: pull your last three Forms 5500, your most recent ACA filing, and one random claims appeal file. Compare turnaround times, error rates, and documentation completeness against industry benchmarks (like those in our comparison table above). Then, schedule a vendor assessment using our free TPA Evaluation Checklist—it includes 27 must-ask questions vetted by ERISA attorneys and former DOL investigators. Stop outsourcing tasks. Start outsourcing outcomes.