Every August, a portion of ACA Marketplace clients receive a check from their carrier. Most of them do not know why. Some assume it is a billing error. A few call their broker. The ones whose brokers explained the medical loss ratio rule in advance handle it without confusion. The rest generate calls that take twenty minutes to resolve.
Key Takeaways
- ACA Section 2718 requires carriers in the individual and small-group markets to spend at least 80 percent of premiums on medical claims and quality improvement activities. Large-group carriers must hit 85 percent. Carriers that fall short owe rebates to policyholders by September 30 of the following year.
- MLR is calculated on a three-year rolling average, not a single plan year, so one good-claims year does not automatically trigger a rebate or one bad year automatically avoid it.
- For APTC-subsidized clients, the rebate is not entirely theirs. The IRS treats the rebate as partially belonging to the federal government in proportion to the APTC share of the gross premium. The policyholder keeps the portion that reflects their own premium contribution.
- Rebates arrive by carrier check, premium credit, or direct deposit. Policyholders who are no longer enrolled on that plan when the rebate is issued receive a check to their last known address.
- A carrier's historical MLR data is publicly available through CMS. Brokers can check which carriers in a given state have been close to or below the threshold — a signal of a healthier risk pool, not just administrative efficiency.
What the 80/20 rule requires carriers to do
ACA Section 2718 established minimum medical loss ratio requirements that took effect in 2011. The rule is straightforward: carriers in the individual and small-group markets must spend at least 80 cents of every premium dollar on medical claims and approved quality improvement activities. Large-group carriers must spend 85 cents. Anything the carrier keeps beyond that threshold — for administration, profit, or overhead — violates the rule and triggers a rebate obligation.
Quality improvement spending that counts toward MLR must meet a specific HHS definition. Improving patient safety, reducing hospital readmissions, implementing evidence-based protocols, and similar clinical activities qualify. Generic customer service improvements, broker portal upgrades, and administrative technology do not.
| Market segment | MLR threshold | Rebate trigger | Payment deadline |
|---|---|---|---|
| Individual (non-grandfathered) | 80% | Medical + quality improvement spending below 80% of premium | September 30 of year following the MLR reporting year |
| Small group (1–50 employees) | 80% | Medical + quality improvement spending below 80% of premium | September 30 of year following the MLR reporting year |
| Large group (51+ employees) | 85% | Medical + quality improvement spending below 85% of premium | September 30 of year following the MLR reporting year |
The three-year rolling average that most clients do not know about
Carriers do not calculate MLR compliance year by year. The rule uses a three-year rolling average, which means a carrier that spent 78 percent on claims in one year might still pass the MLR test if the prior two years averaged above 82 percent. This also works in reverse: a carrier that spent 82 percent in the most recent year could still owe a rebate if a bad two-year stretch dragged the rolling average below 80 percent.
The three-year methodology matters when a client asks why they received a rebate from a carrier they perceived as a good insurer. A rebate is not evidence that the carrier skimped on care in the most recent year. It is evidence that the three-year average of what the carrier retained exceeded what the ACA allows. Carriers with tight, well-managed networks can and do generate rebates in years when claims were unusually low across their member pool.
The APTC split: not all of the rebate belongs to the client
This is the part most brokers skip, and it is the part that occasionally produces a confused tax notice. For clients who received Advanced Premium Tax Credit during the plan year that generated the rebate, the IRS and HHS treat the rebate as belonging to two parties in proportion to what each contributed to the gross premium.
The IRS position: the government effectively paid the APTC share of the premium, so the government is entitled to the APTC-proportional share of the rebate. The policyholder is entitled to the share that reflects what they actually paid out of pocket. In practice, most carriers remit the full rebate to the policyholder, and the IRS reconciliation happens through Form 8962 if the client received a rebate that reduced their effective premium cost.
Example: two clients on the same Silver plan in the same rating area. Both receive a $600 rebate. Their APTC levels are different.
| Client | Gross premium | APTC share | Enrollee share | Rebate total | Client keeps | IRS portion |
|---|---|---|---|---|---|---|
| Single adult, Silver plan, 250% FPL | $420/month | $300/month (71%) | $120/month (29%) | $600 (illustrative) | $174 (29% of $600) | $426 (71% of $600) |
| Single adult, Silver plan, 450% FPL | $420/month | $80/month (19%) | $340/month (81%) | $600 (illustrative) | $486 (81% of $600) | $114 (19% of $600) |
Illustrative examples. Actual premiums, APTC, and rebate amounts depend on rating area, household composition, plan year, and carrier MLR calculation.
The pattern: heavy APTC recipients keep a smaller share of the rebate because the government funded a larger share of the premium. The client who paid $120 per month out of pocket is essentially receiving back a fraction of what they personally contributed. The client who paid $340 per month receives a much larger share because they funded more of the premium themselves. Neither client is doing anything wrong, and neither receives a rebate notice explaining this split. The broker explaining it in advance is the one who does not spend an hour on the phone in September.
For a deeper look at how APTC reconciliation works at tax time, read Form 1095-A and Form 8962 for ACA brokers. For the repayment cap rules when income exceeds the projection, see APTC repayment caps and excess APTC.
How rebates are delivered and what happens to former enrollees
Carriers have three options for delivering MLR rebates to individual market policyholders: a check mailed to the last known address, a premium credit applied to future months, or a direct deposit if banking information is on file. Carriers must notify policyholders of the rebate and explain how to receive it within 30 days of the September 30 payment deadline. Most notices arrive in late August.
Clients who switched carriers during OEP and are no longer enrolled on the plan that generated the rebate receive a check. There is no automatic electronic forwarding. If the client moved during the year without updating their address with the prior carrier, the check may be sent to an old address. Brokers whose clients are likely to receive rebates from plans they left should prompt them in August to confirm mailing information with their prior insurer, particularly if the household moved.
Using MLR data in carrier selection conversations
CMS publishes MLR data by carrier, state, and market segment through its annual MLR reporting database. The data shows each carrier's reported MLR percentage for each of the prior three years, which determines whether a rebate was owed and how much.
A carrier consistently operating at 83 to 87 percent MLR in the individual market is spending most of the premium on claims. That tends to indicate a broader network or more generous formulary, but it also reduces the carrier's financial cushion. A carrier operating at exactly 80 to 82 percent has more room for administrative overhead and profit, which may indicate tighter network management. Neither number directly predicts premium increases, but brokers who ask CMS for the data during carrier evaluation conversations use it alongside rate stability history and network breadth rather than in isolation.
For how the SLCSP benchmark interacts with carrier pricing and APTC calculations, read what is SLCSP and how it is calculated.
FAQ
Common questions about ACA medical loss ratio requirements and rebate checks.
What exactly counts toward a carrier's medical loss ratio?
Medical claims, clinical quality improvement activities, and fraud prevention activities count toward MLR. Administrative expenses, broker commissions, taxes, and general overhead do not. The ACA definition of quality improvement is specific: it must improve health outcomes, implement evidence-based care, reduce medical errors, or provide health coaching. Slick member portals and customer service improvements do not count. CMS publishes the exact methodology at 45 CFR Part 158.
Why does a three-year rolling average matter to brokers?
A carrier that had unusually low claims in one plan year because of a mild flu season or a beneficiary population that happened to have few major events may still meet MLR requirements when averaged with the prior two years. Conversely, a carrier that ran slightly over the threshold one year may still owe a rebate if the three-year average falls below 80 percent. This means a single rebate check does not signal a carrier in perpetual financial distress. It may simply reflect normal claims volatility that averaged out poorly over a three-year window.
If my client received a rebate, does it affect their Form 8962 APTC reconciliation?
It can. If the client received APTC during the plan year for which the rebate was paid, the IRS considers the portion of the rebate attributable to APTC as a reduction in the net premium they paid. The practical consequence is small for most individual clients but worth noting: the policyholder's share of the rebate is treated as income if they deducted premiums as a business expense (self-employed clients deducting health insurance costs). For clients who took the standard deduction and received no APTC, the rebate is not taxable. Brokers should tell clients to review this with their tax preparer, not interpret it themselves.
What happens if the rebate recipient is no longer enrolled on that plan?
Carriers must issue the rebate to the current or last-known policyholder, even if they are no longer enrolled. A client who switched plans during OEP will receive the rebate as a check mailed to their last known address on file with the carrier. Brokers whose clients moved during the year should confirm that the carrier has current mailing information by August of the rebate year. Uncashed checks do not automatically transfer APTC credit to the IRS.
Can brokers use a carrier's MLR history when advising clients on plan selection?
Yes, and some do. CMS publishes MLR data by carrier and state through its annual MLR reporting database. A carrier that has consistently operated above 85 percent in the individual market is spending more on claims, which can be a signal of a more generous formulary or network but may also indicate risk pool issues that precede premium increases. A carrier consistently around 80 to 82 percent has more administrative and profit margin headroom. Neither profile automatically predicts next year's performance, but the data is public and legitimate to share with a client who asks why you prefer one carrier over another.
