What is the difference between a plan document and a summary plan description (SPD)?
Last updated October 2, 2026
The plan document is the formal legal instrument governing the plan — every ERISA plan must have one. The SPD is the plain-language summary that must be distributed to participants. Insurance certificates and booklets alone usually satisfy neither requirement fully.
ERISA requires two related but distinct writings for every health and welfare plan.
The plan document is the governing instrument: it names the plan administrator and fiduciaries, defines eligibility and benefits, establishes amendment and termination procedures, and grants the discretionary authority administrators rely on. Fiduciaries are legally bound to follow it.
The summary plan description translates the plan into language an average participant can understand, and must be furnished automatically — within 90 days of coverage for new participants and on a recurring schedule after amendments.
The common gap: employers assume the insurance carrier's certificate of coverage covers both. It typically contains neither the ERISA-required plan provisions nor the required SPD content, which is why most employers adopt a wrap document.
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