Proof of Insurance: What It Means for Employers

What it means in practice

What the term means. "Proof of insurance" is a general phrase, not a defined term in federal benefits law. For an employer it usually answers one of three questions: did this person have coverage, and for which months; did the employer offer coverage; and when did coverage end. The federal health coverage forms, Forms 1095-A, 1095-B and 1095-C, cover the first two. Letters, notices and plan records cover the third. In workers' compensation the phrase means evidence that an employer carries the coverage its state requires; that meaning is covered near the end.

Which Form 1095 comes from whom. The IRS Q&A on health care information forms says the Marketplace sends Form 1095-A to people who enrolled through it; insurers and other providers send Form 1095-B to people they cover; and applicable large employers (generally 50 or more full-time employees, including full-time equivalents, in the prior year) send Form 1095-C to full-time employees describing the coverage offered. Under the 2025 instructions for both forms, insurers report insured employer coverage, and a small employer files Form 1095-B itself only if its plan is self-insured. A large employer with a self-insured plan reports enrollment in Part III of Form 1095-C; if its plan is insured, the insurer reports enrollment and Part III stays blank. For the employer shared responsibility rules behind Form 1095-C, see the Affordable Care Act entry.

What does not count. The 1095-B instructions say minimum essential coverage does not include coverage made up only of excepted benefits, and list vision and dental coverage that is not part of a comprehensive plan, workers' compensation coverage and coverage limited to a specified disease or illness. A stand-alone dental card is therefore not proof of minimum essential coverage.

What employees do with the forms. The IRS says Form 1095-A is used to complete Form 8962 and reconcile advance payments of the premium tax credit, so a person expecting one should wait for it before filing. Forms 1095-B and 1095-C are not needed to file. The IRS Q&A lists other proof that can be used instead: insurance cards, explanation of benefits statements, insurer statements, W-2 or payroll statements reflecting health insurance deductions, and records of advance payments of the premium tax credit. It adds, "you will not need to send the IRS proof of your health coverage." The IRS page on Form W-2 reporting says the cost of coverage shown in box 12 with code DD "does not mean that the coverage is taxable"; see the W-2 form entry.

How the forms reach employees. Both sets of 2025 instructions say statements generally go on paper by mail or hand delivery, unless the recipient affirmatively consents to electronic delivery. Under the alternative manner of furnishing, the provider instead posts a clear and conspicuous website notice that individuals may request a copy, with an email address, a mailing address and a telephone number, and furnishes the statement by the later of January 31, 2026, or 30 days after the request. The instructions' example is a "Tax Information" link on the main page leading to the words "IMPORTANT HEALTH COVERAGE TAX DOCUMENTS." Recipient copies of Form 1095-B may truncate SSNs to the last four digits; returns filed with the IRS may not.

Proof of lost coverage for the Marketplace. When a former employee applies for a Marketplace Special Enrollment Period after losing job-based coverage, HealthCare.gov may ask for documents showing the coverage loss and its date. Acceptable documents include an employer letter on official letterhead confirming that coverage was or will be dropped, that the employer stopped contributing, or that coverage changed so it no longer qualifies; a letter confirming a COBRA offer and start date, or that COBRA ended; and pay stubs. For a reduction in hours, HealthCare.gov accepts one earlier stub showing 30 or more hours and a health deduction, plus one from the past 60 days showing fewer than 30 hours and no deduction. The applicant picks a plan within 60 days after coverage ends (90 days for lost Medicaid or CHIP) and submits documents within 30 days of picking a plan. For the life events involved, see qualifying life event.

Proof of offered coverage: employer appeals. HealthCare.gov says an employer that gets a Marketplace notice about an employee's eligibility for savings may appeal within 90 days of the date on the notice, with documents that verify the offer, its affordability and its minimum value. The IRS, not the Marketplace, decides whether a fee is owed. A CMS guide to appeal documents gives examples: to prove an offer, a dated election or waiver form with the employer's name, the employee's full name, the coverage period and any waiting period, with the employee's signature on a waiver. It says not to send a Summary of Benefits and Coverage to prove an offer, though an SBC can help show minimum value. The guide's affordability percentage is for 2017; check IRS.gov for the current figure.

Proof for Medicare. An employee who delayed Medicare Part B while covered by a job-based plan uses Form CMS-L564, "Request for Employment Information," which CMS describes as proof of group health plan coverage based on current employment. The employee completes Section A; the employer completes Section B with coverage and employment dates (and, for a large plan and a disabled applicant, the months the plan paid first) and a company official's signature. The form says coverage must not have ended more than 8 months ago. Separately, CMS requires plans with prescription drug coverage to tell Medicare-eligible individuals before October 15 each year whether it is creditable, and to report that status to CMS within 60 days after the plan year begins. A gap in creditable coverage of 63 days or longer can trigger a Part D late enrollment penalty. For which plan pays first, see secondary insurance.

COBRA notices as proof. The DOL employer's guide to COBRA says the law generally applies to private-sector group health plans of employers with at least 20 employees on more than half of typical business days in the prior year. The plan gives a general notice within the first 90 days of coverage, the employer notifies the plan within 30 days after a qualifying event such as termination, and the plan sends an election notice within 14 days after receiving that notice. Under 29 CFR 2590.606-1 and 2590.606-4, these notices are furnished under 29 CFR 2520.104b-1, which requires "measures reasonably calculated to ensure actual receipt" and permits first-class mail; second- or third-class mail needs guaranteed return and forwarding postage and address correction. The rules judge delivery by method, not by a signed receipt.

Notices that employees owe the plan. Under 29 CFR 2590.606-3, a covered employee or qualified beneficiary must give notice of a divorce, legal separation, a child's loss of dependent status, a second qualifying event, or a Social Security Administration disability determination. The plan must describe its procedures in the summary plan description, and the deadline cannot end sooner than 60 days after the latest of the dates listed in the rule. The plan may require its own form if the form is easily available at no cost. A notice that is missing some details is still timely if it identifies the plan, the employee, the qualified beneficiaries, the event and its date. For the SPD itself, see summary plan description.

The obsolete HIPAA certificate. Plans once issued certificates of creditable coverage so a new plan could shorten a preexisting condition exclusion, as the HealthCare.gov glossary still describes. Since 2014, 29 CFR 2590.701-5 says those rules are superseded by the ban on preexisting condition exclusions in 29 CFR 2590.715-2704. One related HIPAA rule remains in 29 CFR 2590.701-6: a plan may require an employee who declines coverage to say in writing whether it is because of other coverage, but only if the employee is told of the requirement at that time. It cannot require more, such as notarization.

Dependent verification. No federal rule cited here prescribes which documents prove a dependent's eligibility; plan terms do. Federal rules limit the process. Under 29 CFR 2590.715-2714, for a child under 26 a plan may define "dependent" only by relationship to the participant, not by financial dependency, residency, student status, marriage or employment. Under 29 CFR 2590.715-2712, cancelling coverage retroactively is a rescission. It is allowed only for fraud or an intentional misrepresentation of material fact and needs at least 30 days' advance written notice; a cancellation that takes effect only going forward is not a rescission. For reporting, Form 1095-C Part III asks for each covered individual's SSN or other TIN, or a date of birth if no TIN is entered. The instructions also point to proposed rules on soliciting TINs.

Proof of workers' compensation coverage. This is a different kind of proof, and it follows state law. For example, the California Division of Workers' Compensation FAQ says every California employer must insure with a licensed insurer or self-insure, that the division keeps no records of which insurer covers which employer, and that the California Workers' Compensation Coverage website offers that lookup. Certificates of insurance collected from vendors are tracked separately; see certificate of insurance (COI) tracking and the workers' compensation entry.

Where states differ. Some states require residents to have coverage and collect their own proof. For example (not a complete list), New Jersey's Division of Taxation says that, unlike the IRS, it requires a 1095 form to be sent to each primary enrollee. A 1095-C with only Parts I and II completed does not meet its rules, and an employer must file if its insurer does not. California's Franchise Tax Board requires providers of minimum essential coverage to file the federal 1094 and 1095 forms with it and may assess a penalty of $50 per individual after its extended due date (FTB page updated December 2025) [VERIFY ANNUALLY]. Check the tax agency in each state where employees live.

Example 1 (illustration): hours cut. An employee's hours drop from 32 to 25 a week and group coverage ends on June 30, 2026. Using the HealthCare.gov rules, the employee has until August 29, 2026 (60 days after June 30) to pick a Marketplace plan, then 30 days from that choice to submit documents. An earlier stub showing 32 hours and a health deduction, plus a recent one showing 25 hours and none, fits the pay stub option.

Example 2 (illustration): a request under the alternative method. A former employee enrolled in a self-insured plan asks for a 2025 Form 1095-C on February 20, 2026. Under the later-of rule in the 2025 instructions, the copy is timely if furnished by March 22, 2026, 30 days after the request, because that date is later than January 31, 2026.

Example 3 (illustration): Medicare at 67. A retiree's job-based coverage ended on March 31, 2026. A CMS-L564 completed by the employer and submitted in October 2026 falls within the form's 8-month limit; one submitted in January 2027 would not.

Recordkeeping. The 1094-C and 1095-C instructions say to keep copies of filed information returns, or the ability to reconstruct the data, for at least 3 years from the due date. This entry does not decide whether a particular document meets a plan, agency or state requirement.

Why it matters and common mistakes

How Remindax helps

Related terms

See all terms in Benefits & Insurance or browse the full HR Glossary.