Form 5500 for Self-Funded Plans and Multiemployer Funds: What Sponsors and Trustees Must File

Every year, benefit plans covered by ERISA owe the federal government a detailed account of how they operate. That account is Form 5500, the annual report filed with the Department of Labor, the IRS and the Pension Benefit Guaranty Corporation. It shows regulators how a plan is funded, who it covers and who was paid to run it.

For an employer that sponsors a plan, the filing is a compliance task. For the trustees of a multiemployer fund, it carries more weight. The return is a public record, and it reflects how well the fund’s administration held up across the whole year: whether eligibility data was accurate, whether contributions were tracked and whether service providers were properly documented.

Knowing which plans must file, which schedules apply and where the data comes from is what separates a routine filing from a last-minute fix. This guide walks through each of those, the mistakes that draw regulator attention and the part a TPA plays in keeping the filing clean.

Which Plans and Funds Must File a Form 5500

The filing rule depends on how a plan is funded and how many participants it has. Whether a plan is self-funded is only part of the answer, and the distinctions below are where sponsors and trustees most often get tripped up.

Multiemployer health and welfare funds

These funds hold employer contributions in a trust, which makes them funded plans under the filing rules. A funded welfare plan files every year regardless of how many participants it has, so there is no size threshold for trustees to test. If the fund exists, the return is due.

Self-funded employer plans

A self-funded employer plan that pays claims entirely from the employer’s general assets files when it has 100 or more participants on the first day of the plan year. Smaller plans that are unfunded or fully insured are generally exempt. That exception disappears when participant contributions are held separately: a plan that is not paid exclusively from general assets is treated as funded and must file regardless of size.

Counting participants correctly

Count participants, not payroll headcount. The count is taken at the start of the plan year and includes people enrolled through COBRA. Plans near the 100-participant line should check the number carefully, because it also decides whether an audit is required. Multiemployer funds carry extra complexity here because they answer to both ERISA and the Taft-Hartley Act, as our overview of multiemployer plan administration explains.

Key takeaway: Filing depends on funding structure and participant count, not on whether a plan is self-funded. Trust-funded plans always file, and every other plan should test itself against the 100-participant line.

Form 5500 Schedules, Audits and Deadlines

The return is due on the last day of the seventh month after the plan year ends, which is July 31 for a calendar-year plan. Form 5558 adds up to two and a half months, moving that date to October 15. Every Form 5500 must be filed electronically through EFAST2, and the Department of Labor’s Form 5500 page hosts the current forms and instructions. Which schedules a plan attaches depends on how it is funded and how large it is.

Schedule A: Insurance Information

Schedule A reports insurance contracts, premiums and commissions. It is not filed for administrative services only contracts. A stop-loss policy appears on it only when the plan itself is the policyholder, which is typical of trust-funded plans.

Schedule C: Service Provider Information

A large plan completes Schedule C when any provider received $5,000 or more in direct or indirect compensation from the plan. Trustees should be able to trace those payments back to clean records, since this is where the fund’s vendors are disclosed.

Schedule H: Financial Information

Schedule H carries the financial information for large plans, including assets, liabilities, income and expenses. Small funded plans report the same information on Schedule I. It also comes with an audit. A funded welfare plan with 100 or more participants needs an independent audit by a qualified public accountant, and the report is filed with the return. The auditor needs clean financial records, which is one more reason the year-round data behind the filing matters.

Schedules R and MB: Retirement Plan Information

These apply to retirement plans. Multiemployer defined benefit plans add Schedule MB for actuarial information, so funds that also sponsor a pension plan should expect additional schedules on that return.

Where Form 5500 Filings Go Wrong

Most problems come from small errors that compound over time. Three areas account for much of what regulators and auditors see.

Miscounted participants

Mixing up employees and participants, or missing COBRA participants, can put a plan on the wrong side of the 100-participant line. That one number drives whether the plan files, which form it uses and whether an audit is attached.

Incomplete or inconsistent forms

The DOL tracks filings by the sponsor’s EIN and plan number, so a mistyped number or an empty required field creates problems that follow the plan from year to year. Mismatches matter too. When the main return describes one funding arrangement and the schedules suggest another, it invites questions about how the plan is funded.

Bonding and disclosure gaps

ERISA requires everyone who handles fund assets to be bonded at no less than 10% of the funds handled, within minimum and maximum limits. Leaving the bond question blank, or failing to revisit bond levels as assets grow, is a common gap. Trustee compensation, where it is paid, must also be reported, and choosing the wrong plan type by confusing a single-employer plan with a multiemployer plan changes which schedules apply.

What to watch for: Errors in one part of the return tend to surface in another. A participant count that does not match the schedules or a missing bond answer can prompt a closer look at the whole filing.

Costs for late filing

The DOL can assess up to $2,739 per day with no cap. The IRS can add $250 per day, up to $150,000 per plan year. Each agency can penalize the same missed filing.

The DOL’s Delinquent Filer Voluntary Compliance Program (DFVCP) offers a way out at a far lower price. The administrator files the late return electronically, marks the DFVCP box and pays a reduced penalty calculated at $10 per day. The program is closed once the DOL sends written notice of the failure to file, so acting early matters. The IRS generally extends penalty relief to plans that meet the program’s conditions.

What a TPA Handles and What Stays With the Trustees

Trustees are typically the plan administrator, which means the filing is theirs. The fund’s accountant prepares the financial statements and audit, and counsel advises on structure and compliance. A TPA does not replace either one.

What a TPA does control is the data the return draws on: eligibility and enrollment counts, contribution records, claims experience and the payments made to service providers that feed Schedule C. When those records are accurate all year, the filing becomes a review instead of a scramble. A TPA that tracks deadlines, flags the extension option and delivers trustee reports in a usable format takes real pressure off the fund office. Our health and welfare fund administration is built around that kind of year-round accuracy.

The same division of labor applies to a self-funded employer. Finance or HR owns the filing, and the TPA supplies participant and claims data. Employers evaluating support for a self-funded plan can see how that works in our self-funded health plan administration.

Key takeaway: The filing belongs to the plan administrator. A TPA’s job is to make sure the numbers behind it are complete, consistent and ready well before the deadline.

Frequently Asked Questions

Do participants receive a copy of the Form 5500?

Many plans must give participants a summary annual report within the required timeframe. Separately, anyone can look up a plan’s filing through the DOL’s Form 5500 search, so participants, consultants and competing administrators can all see what the fund reported.

What if the fund’s plan year is not the calendar year?

The deadline moves with the plan year. A fund with a June 30 year end files by January 31, and a Form 5558 extension pushes that to April 15. Funds on non-calendar years should build their own filing calendar rather than assuming July 31.

Does a fund file one Form 5500 or several?

Each plan files its own return. If medical, dental and vision are separate plans, each may need its own filing. A wrap plan document can combine welfare benefits into a single plan and a single return. Counsel should confirm how the fund’s benefits are structured before the filing season starts.

Who signs the Form 5500, and why does it matter?

The plan administrator signs the return and is attesting to its accuracy. Trustees should review the completed form and every schedule before it goes in, not just the cover page.

Where MagnaCare Fits

MagnaCare has administered labor funds for more than 35 years, and the work behind a clean Form 5500 is the work we do every day. Eligibility and enrollment, hours administration, contribution accounting, delinquency tracking and claims data sit on one platform, so trustees and fund accountants get the records they need without rebuilding them each spring.

We also support the trustees around the filing: reporting built for fiduciary oversight, help coordinating board meetings and a team that knows how a multiemployer fund operates. The trustees still own the return. Our job is to make sure the information behind it is complete and ready when they need it, whether the fund is one of the labor funds we administer or a self-funded employer plan.

Have questions about how your fund’s data feeds its annual filing? Contact MagnaCare to talk it through with our team.