I've watched it happen dozens of times. An HR director calls our team in March, proud they've filed their 1094-C and 1095-C forms with the IRS right on deadline. Then April rolls around, and they get hit with a penalty notice from California's Franchise Tax Board. Or Massachusetts. Or New Jersey.
The problem? They had no idea their employees living in those states triggered separate state-level reporting requirements on top of federal ACA filing.
When Congress effectively eliminated the federal individual mandate penalty in 2019, six states and the District of Columbia decided to create their own. And with those state mandates came state reporting requirements - complete with different deadlines, different forms, different penalties, and different filing portals.
For companies expanding across state lines, this creates a compliance minefield. You're not just dealing with one set of ACA rules anymore. You're juggling multiple state mandates, each with its own interpretation of what qualifies as minimum essential coverage and how employers must report it.
The Federal ACA Reporting Baseline - What Every Employer Files
Let me start with what hasn't changed. Federal ACA reporting still applies to every Applicable Large Employer nationwide.
If your company employed an average of 50 or more full-time and full-time equivalent employees during 2024, you're an ALE for 2025. That means you must file Forms 1094-C and 1095-C with the IRS by March 31, 2025 (if filing electronically, which is required for 10 or more forms).
These federal forms document:
- Whether you offered minimum essential coverage to at least 95% of your full-time employees
- Whether that coverage was affordable based on one of the three IRS safe harbors
- Whether the coverage provided minimum value (covering at least 60% of total allowed costs)
- Which months each full-time employee was offered coverage and what their required contribution was
For self-insured employers, you also complete Part III of Form 1095-C to report which individuals were covered under your plan each month - employees, spouses, dependents.
These federal requirements don't go away when states add their own mandates. Federal filing is your foundation. State reporting is layered on top.
Six States Now Require Additional ACA Reporting - Is Yours One of Them?
Here's where it gets complicated. As of 2025, six states and the District of Columbia have individual mandates requiring residents to maintain health coverage or pay a state tax penalty.
Those jurisdictions are:
- California - mandate effective January 1, 2020
- Massachusetts - mandate in place since 2006, predating the ACA
- New Jersey - mandate effective January 1, 2019
- Rhode Island - mandate effective January 1, 2020
- District of Columbia - mandate effective January 1, 2019
- Vermont - mandate effective January 1, 2020
Five additional states have considered but not yet enacted individual mandates: Connecticut, Hawaii, Maryland, Minnesota, and Washington. If you're expanding into any of these states, monitor legislative developments closely.
The critical point: these aren't uniform requirements. Each state has its own deadlines, its own acceptable forms, its own penalties, and its own filing portals. You can't just submit your federal forms and call it done.
Let me walk you through each state's specific requirements.
California - The Largest State Mandate With Strict Deadlines
California hits you with the earliest employee furnishing deadline and some of the strictest penalties.
Here's what California requires:
Who must file: Any employer (in-state or out-of-state) that provides minimum essential coverage to California residents. This includes both fully-insured and self-insured plans.
What to file: Forms 1094-B/C and 1095-B/C - the same federal forms, but submitted separately to the California Franchise Tax Board (FTB).
Where to file: Through California's Minimum Essential Coverage Information Reporting (MEC IR) program. Electronic filing is required if you're submitting 250 or more forms of the same type.
2025 Deadlines:
- January 31, 2025 - Furnish Form 1095-B/C to California resident employees (note: California won't penalize you for missing this date, but you should still comply)
- March 31, 2025 - File Forms 1094/1095 with California FTB (automatic extension to May 31 if needed)
Penalties: $50 per individual not reported on. No maximum cap listed.
Special considerations for California:
If you offer fully-insured coverage, your insurance carrier should handle the reporting. But don't assume they will. Contact your carrier by January to confirm they're filing California forms on your behalf. If they're not, you're on the hook.
For self-insured plans, you're always responsible for California reporting, regardless of whether a TPA assists with federal filing.
California's penalty doesn't apply to failing to furnish forms to employees by January 31 - only to failing to file with the state by March 31. But that doesn't mean you should skip the employee distribution. Employees need those forms to prove coverage when filing California state taxes.
Massachusetts - The Original State Mandate With Unique Forms
Massachusetts stands apart because its mandate predates the ACA. The state uses its own form - Form MA 1099-HC - rather than federal forms.
Here's the Massachusetts framework:
Who must file: Any employer that employs Massachusetts residents and offers health coverage - whether fully-insured or self-insured. This includes out-of-state employers with even one Massachusetts employee, provided you have at least six total employees.
What to file: Form MA 1099-HC. This is Massachusetts-specific, not a federal form. You cannot substitute a 1095-C.
Where to file: Electronically through the MassTaxConnect portal.
2025 Deadlines:
- January 31, 2025 - File Form MA 1099-HC with Massachusetts Department of Revenue
- March 3, 2025 - Furnish Form MA 1099-HC to Massachusetts resident employees
Yes, you read that correctly. Massachusetts requires you to file with the state before you furnish forms to employees. It's the reverse of most reporting requirements.
Penalties: $50 per individual for whom you fail to file, up to a maximum of $50,000.
Special considerations for Massachusetts:
Form MA 1099-HC requires information about whether the coverage meets Massachusetts' definition of Minimum Creditable Coverage (MCC), which is more stringent than federal minimum essential coverage in some respects.
For fully-insured plans, your carrier typically files the MA 1099-HC. For self-insured plans, you're responsible - and many payroll providers don't automatically generate Massachusetts forms even if they handle your federal ACA reporting.
Massachusetts has been enforcing these requirements since 2006. They're not lenient with first-time offenders.
New Jersey - Partial Form Requirements For Residents
New Jersey takes a middle-ground approach, requiring federal forms but only certain sections.
Who must file: Any employer providing group coverage to New Jersey residents, regardless of where your company is located or whether you withhold New Jersey payroll taxes.
What to file: Federal Forms 1094-C and 1095-C (or 1094-B and 1095-B for small employers with self-insured plans). However, New Jersey only requires Parts I and III of Form 1095-C to be completed.
Where to file: Electronically through New Jersey's Division of Taxation via MFT SecureTransport (Axway) service. Paper filing is not available.
2025 Deadlines:
- March 3, 2025 - Furnish Form 1095 to each New Jersey resident employee
- March 31, 2025 - File Forms 1094/1095 electronically with New Jersey Division of Taxation
Penalties: New Jersey has not publicly specified penalty amounts. But the state can assess penalties for non-compliance.
Special considerations for New Jersey:
The acceptable forms are broader than other states. New Jersey will accept fully completed federal Forms 1095-A, 1095-B, or 1095-C. They'll also accept Forms 1095-C with only Parts I and III completed (skipping Part II, which shows the offer of coverage codes).
If you participate in a multi-employer plan and the plan sponsor files the report, individual employers can avoid separate filing.
New Jersey's reporting obligation applies even if the employer doesn't withhold New Jersey payroll taxes - so remote employees working from New Jersey still trigger your filing requirement.
Rhode Island - Recent Mandate With Federal Form Piggybacking
Rhode Island's individual mandate took effect January 1, 2020, making it one of the newer state requirements.
Who must file: Employers with self-insured major medical plans covering Rhode Island residents.
What to file: Federal Forms 1095-C (for large employers) or 1095-B (for small employers) - the same forms you file with the IRS.
Where to file: Electronically with the Rhode Island Division of Taxation.
2025 Deadlines:
- March 3, 2025 - Furnish Form 1095 to Rhode Island resident employees
- March 31, 2025 - File forms electronically with Rhode Island Division of Taxation
Penalties: Rhode Island calculates individual penalties as $695 per adult and $347.50 per child, or 2.5% of gross income above the Rhode Island tax filing threshold, whichever is higher. Employer penalties for non-compliance have not been publicly specified.
Special considerations for Rhode Island:
For fully-insured plans, contact your insurance carrier to confirm they're filing Form 1095-B with Rhode Island on your behalf. If your carrier doesn't file, you must.
Rhode Island's deadlines align with the new federal extended deadlines (March 3 for furnishing, March 31 for filing), making it easier to manage if you're already compliant with federal requirements.
District of Columbia - Extended Deadline But Electronic-Only Filing
D.C. gives you more time to file but requires electronic submission through a specific portal.
Who must file: Any entity providing minimum essential coverage to a D.C. resident.
What to file: Federal Forms 1094-B/C and 1095-B/C.
Where to file: Exclusively through the MyTaxDC portal. Paper submissions are not accepted under any circumstances.
2025 Deadlines:
- March 3, 2025 - Furnish Form 1095 to D.C. resident employees (D.C. considers the federal furnishing requirement sufficient)
- April 30, 2025 - File forms electronically with D.C. Office of Tax and Revenue (OTR) - this is 30 days after the federal electronic filing deadline
Penalties: D.C. has not specified penalties for employer non-compliance. However, D.C. residents who fail to obtain qualifying insurance face a penalty of 2.5% of their salary or $700.
Special considerations for D.C.:
The District does not separately require employers to furnish written statements to covered employees because they've determined the federal furnishing requirement is sufficient. This means one less distribution deadline to track.
The April 30 deadline gives you an extra month compared to most states, but it's tied to the federal deadline - if the IRS extends the federal filing deadline, D.C.'s deadline moves 30 days after that extended date.
Vermont - The Mandate Without Employer Reporting (For Now)
Vermont is the outlier. The state has an individual mandate requiring residents to maintain coverage, but currently does not require additional employer reporting.
Current status: Vermont relies on federal Form 1095-C distribution to residents. As long as federal ACA reporting requirements remain in place, Vermont employers have no additional state filing obligations.
The catch: Vermont has explicitly stated that if federal ACA reporting requirements are eliminated, the state will implement its own employer reporting requirements.
What Vermont requires now:
Vermont residents must indicate on their state income tax return whether they maintained minimum essential coverage. If requested by the state, they must submit their Form 1095-C as proof.
Penalties: Vermont does not impose cash penalties on individuals for failing to maintain coverage. Employers currently face no penalties because there are no employer reporting requirements.
Why this matters: If you employ Vermont residents, continue distributing federal Forms 1095-C to them by the March 3 deadline. They need these forms to complete their Vermont state tax returns, even though you're not filing anything directly with Vermont.
Multi-State Expansion - How To Determine Your Filing Obligations
This is where it gets real. You're growing, opening offices in new states, hiring remote employees across the country. How do you figure out which state mandates apply to you?
Follow this decision tree:
Step 1: Identify where your employees live, not where they work
State ACA reporting is based on employee residence. A Texas-based company with one employee who lives in California must comply with California reporting for that employee.
Pull a report from your HRIS or payroll system showing each employee's home address by state. Don't rely on where they physically work - remote work has made residency the determining factor.
Step 2: Cross-reference residents with the six mandate states
Do you have employees residing in California, Massachusetts, New Jersey, Rhode Island, District of Columbia, or Vermont? If yes, you have potential state reporting obligations.
Even one employee in a mandate state can trigger filing requirements, depending on the state. Massachusetts explicitly requires reporting if you have six or more total employees and any Massachusetts residents. New Jersey and California have no minimum employee thresholds.
Step 3: Determine your plan type for each state
Are you offering fully-insured or self-insured coverage to residents of mandate states?
For fully-insured plans, your insurance carrier may handle state reporting. But you must confirm this in writing. Don't assume.
For self-insured plans (including level-funded arrangements), you're always responsible for state reporting.
Step 4: Check if you're part of a controlled group
If your company is part of a controlled group under IRS Section 414, each entity with its own EIN must file separate forms. This applies to both federal and state reporting.
Example: Your parent company is based in Florida with 30 employees. Your subsidiary in California has 25 employees. Together, you're an ALE with 55 total employees. Both entities must file separate 1094-C forms with the IRS. And the California subsidiary must file separate California state forms for its 25 California residents.
Step 5: Account for employees who move mid-year
An employee who lives in New York for six months, then relocates to California for six months, triggers California reporting for the months they were a California resident.
Your payroll system should track address changes with effective dates. Use those dates to determine which months require state reporting for which states.
Controlled Groups and State Reporting - Special Considerations
Controlled groups create layered complexity when multiple entities span multiple states.
Here's what I see companies miss:
Each entity files separately, even for state reporting
Just like federal ACA reporting, each Applicable Large Employer Member (ALEM) in a controlled group must file its own state forms for the residents it employs.
Parent Company A employs 40 people in California. Subsidiary B employs 15 people in California. Together they're an ALE with 55 employees. Both companies must file separate California state forms - Company A for its 40 California residents, Company B for its 15.
The 95% offer test is siloed by entity, but aggregated for ALE status
When calculating whether you're an ALE, you combine all employees across all entities in the controlled group.
But when determining if you offered coverage to 95% of full-time employees (to avoid the 4980H(a) penalty), each entity is measured separately.
This matters for state reporting because you're documenting your offer of coverage on a per-entity basis.
Employees who work for multiple entities in one month
If an employee works for more than one ALEM in your controlled group during any calendar month, the ALEM for whom the employee worked the most hours is responsible for that employee's Form 1095-C for that month.
That same rule applies to state reporting. The entity that reports the employee on federal Form 1095-C is the entity responsible for reporting to the state (for that month).
State penalties apply to the entity that failed to file
Unlike federal penalties, which can apply to the entire aggregated group, state penalties target the specific legal entity that failed to file.
This means proper tracking by EIN is critical. You can't just lump all your California employees together if they work for different entities.
What Happens If You Miss State Deadlines?
Let's talk about the penalty structure, because it varies significantly by state.
California: $50 per individual who was provided health coverage but not reported. No stated maximum. For a company with 200 California employees, that's a $10,000 penalty.
Massachusetts: $50 per individual not reported, up to $50,000 maximum per employer.
New Jersey: Penalties authorized but not specified in published guidance. Expect to pay something comparable to California or Massachusetts if caught.
Rhode Island: No published employer penalties yet, but the state has authority to assess them.
District of Columbia: No published employer penalties. However, D.C. can assess penalties on individuals ($700 or 2.5% of salary), creating pressure to comply so your employees don't face penalties.
Vermont: No penalties because no reporting required (yet).
The penalties above apply per unfiled return - meaning if you miss both the furnishing deadline and the filing deadline, you potentially face penalties for each violation.
Beyond monetary penalties, non-compliance creates operational headaches:
- Employee complaints when they can't prove coverage on their state tax returns
- State audit triggers when a pattern of non-reporting emerges
- Carrier disputes if you claim the carrier was supposed to file but they disagree
- Correction filing requirements that force you to re-submit forms electronically through unfamiliar portals
Most states don't offer automatic extensions. If you miss the deadline, you're immediately in violation.
California provides an automatic extension to May 31 for filing (but not furnishing). Massachusetts offers no extensions. Neither does New Jersey.
This is not federal ACA reporting where the IRS has historically shown leniency for good-faith efforts. State tax agencies are enforcing these mandates aggressively because they're tied to individual mandate penalties that generate state revenue.
I've seen companies discover in June that they missed a March 31 California deadline. They scrambled to file late, paid the penalty, and then discovered they still had to furnish corrected forms to every California employee because the originals were never sent.
The correction process cost them more than 10 times what proper compliance would have cost upfront.
Your State Reporting Compliance Checklist
Here's your ACA Reporting Compliance action plan before the 2025 deadlines hit:
By December 31, 2024:
- Pull a state residency report for all employees from your HRIS. Sort by state.
- Identify which mandate states you have residents in: California, Massachusetts, New Jersey, Rhode Island, D.C., Vermont.
- Determine your plan type (fully-insured vs. self-insured) for each state.
- Contact your insurance carriers if you have fully-insured plans and confirm in writing they'll file state forms.
- Register for state filing portals - California MEC IR, MassTaxConnect, New Jersey MFT SecureTransport, MyTaxDC - registration can take 2-3 weeks.
By January 15, 2025:
- Generate your federal Forms 1095-C - these form the foundation for most state filings.
- Generate Massachusetts Form MA 1099-HC if you have Massachusetts residents (this is separate from federal forms).
- Review all forms for accuracy before filing or distributing - incorrect SSNs, wrong months of coverage, or missing offer codes will trigger penalties.
By January 31, 2025:
- File Form MA 1099-HC with Massachusetts (deadline for state filing).
- Furnish Form 1095-B/C to California resident employees (no penalty for missing but best practice).
By March 3, 2025:
- Furnish Form 1095-C to all employees (federal requirement).
- Furnish Form MA 1099-HC to Massachusetts resident employees.
- Furnish Form 1095 to New Jersey resident employees.
- Furnish Form 1095 to Rhode Island resident employees.
By March 31, 2025:
- File Forms 1094-C and 1095-C with the IRS electronically (federal requirement).
- File Forms 1094/1095 with California Franchise Tax Board.
- File Forms 1094/1095 with New Jersey Division of Taxation.
- File Forms 1095 with Rhode Island Division of Taxation.
By April 30, 2025:
- File Forms 1094/1095 with D.C. Office of Tax and Revenue.
Notice the waterfall of deadlines. This isn't something you can handle the night before March 31. State ACA reporting requires planning, system access, and coordination across your HR, benefits, and payroll teams.
If you're working with a TPA or ACA reporting vendor, confirm now - not in February - which state filings they handle. Many vendors file federal forms but leave state filing to the employer.
The companies that handle multi-state ACA reporting well treat it like a project with milestones, not a task to complete in March. They assign ownership, they track deadlines in a compliance calendar, and they build in review time for data quality.
The companies that fail wait until March, discover their vendor doesn't file to states, panic-register for state portals, submit forms full of errors, and then spend April and May dealing with penalty notices and corrections.
You're expanding across states because you're growing. Don't let ACA compliance failures slow that growth. Plan for state reporting the same way you plan for state tax withholding, workers' compensation, and unemployment insurance - as a necessary compliance layer that comes with multi-state operations.
If you need help navigating state reporting requirements or want to ensure your 2025 filings are done correctly, we can help. We've filed millions of ACA forms to both the IRS and state agencies, and we know exactly what each state requires.