ASO (Self-Funded) vs Fully Insured Benefits in Ontario
Direct answer
What is the difference between ASO and fully insured group benefits? In a fully insured plan, the employer pays premiums and the insurer carries the insured claims risk under the contract. In an Administrative Services Only (ASO) arrangement, the employer funds eligible claims and pays a third party to administer them. Fully insured prioritizes budget predictability; ASO prioritizes claims transparency and funding control but exposes the employer to more cash-flow variability. There is no universal employee-count cutoff: compare the contract, claims data, reserves, pooling or stop-loss protection, taxes, fees, and worst-case cash flow before choosing. AEC Benefits, an Ontario group benefits brokerage, quotes group plans at aecbenefits.ca/get-quote or (905) 320-4123.
Key Takeaways
- •ASO (Administrative Services Only) means the employer self-funds claims and pays the insurer an admin fee — more control, more volatility.
- •Fully insured means the insurer takes the claims risk in exchange for a fixed premium — more predictable, less flexibility.
- •Group size matters, but no single employee-count threshold determines whether ASO is appropriate.
- •The right choice depends on group size, cash-flow tolerance, claims stability, and advisor support.
How to use this page
The ASO question is really a volatility question.
Funding structure changes who carries claims risk and how monthly costs can fluctuate. Compare equivalent plan designs and written protection terms before comparing price.
What is fully insured best for?
Predictable monthly premiums, smaller groups, limited cash reserves, and employers that want the insurer to carry claims risk.
What is ASO best for?
Larger, more stable groups that can absorb claims volatility, want more transparency, and model stop-loss protection before switching.
What should be modelled first?
Compare expected claims, admin fees, pooling or stop-loss, reserves, worst-case months, renewal assumptions, and employee disruption risk.
No employee-count cutoff decides ASO. Model claims data, stop-loss, taxes, fees and your worst claims month. A savings percentage is not a comparison.
| Criterion | Option A | Option B |
|---|---|---|
| Decision factor | Fully insured | ASO / self-funded health and dental |
| Claims funding | Insurer funds covered claims under the policy | Employer funds eligible claims; administrator processes them |
| Monthly cash flow | More predictable premium billing | Varies with claims, fees, taxes, and protection structure |
| Claims transparency | Reporting depends on contract and group size | Typically greater financial reporting, subject to privacy and contract terms |
| Risk protection | Defined in the insured contract | Pooling or stop-loss must be understood and priced separately |
| Best fit | Employers prioritizing predictability and risk transfer | Employers able to model, fund, and govern claims variability |
Model these items before moving to ASO
- At least the available multi-year claims experience, adjusted for workforce and plan changes
- Administration fees, premium taxes, pooling or stop-loss charges, and any reserve requirements
- Expected monthly claims and a high-claims scenario the business can absorb
- Which benefits are insured, self-funded, pooled, or excluded under the proposed arrangement
- Privacy-safe reporting, governance responsibilities, termination terms, and run-out claims
- A like-for-like fully insured comparison using the same benefits and employee census
Why employee count is a screening question, not a verdict
A larger group may have more stable claims experience, but size alone does not create cash reserves, reliable data, or a suitable protection structure. A smaller group is not automatically prohibited from ASO, and a larger group is not automatically a good candidate.
Ask the administrator or advisor to show the assumptions, downside scenario, and exact allocation of risk in writing. If the comparison relies only on a promised savings percentage, it is incomplete.
How stop-loss works, in plain terms
Under ASO you pay the claims. Stop-loss is the insurance you buy on top so that one bad claim, or one bad year, does not land on the company's bank account unprotected. There are two kinds, and a quote should name both.
- Individual (specific) stop-loss: a cap per person per year. Above that amount on one employee or dependant, the insurer pays. For a 30-person trades group a cap somewhere between $10,000 and $15,000 is a sensible starting point; the lower the cap, the higher the stop-loss premium.
- Aggregate stop-loss: a cap on the group's total claims for the year, usually set at a percentage above expected claims. Above it, the insurer pays.
Insist on both kinds
Many small-group ASO arrangements include the individual kind and not the aggregate, which means a run of mid-sized claims across several people is yours to fund with no ceiling. Ask which kind you are being quoted, at what level, and what it costs. A stop-loss premium is still a premium, and it carries the same Ontario sales tax as any other insured line.
What Ontario tax does to each structure
This is the part most comparisons skip, and it moves the number by more than a point or two.
- Fully insured: Ontario's 8% retail sales tax applies to the premium. The insurer also pays a 2% premium tax to the province, which is built into the rate you see.
- ASO: the administration fee carries 13% HST. Ask the administrator how Ontario retail sales tax is applied to the claims paid out of the plan, and get it on the same page as the fee before comparing; there is no premium, so it is not charged the way an insured line is.
- Either way, employer-paid health and dental are not a taxable benefit to the employee, and that does not change with funding structure.
A worked month for a 30-person group
Take a 30-person company with a mix of single and family coverage and a fully insured health-and-dental premium around the middle of the published planning range. In a fully insured month, the bill is the premium plus 8% RST, the same every month until renewal.
In an ASO month, the bill is the claims the administrator paid that month, plus the administration fee, plus HST on the fee, plus whatever Ontario sales tax applies, plus the stop-loss premium. In a quiet month that total can sit well below the insured premium. In a month with two root canals, a new specialty drug and an orthodontic down payment it can sit well above it. Over a year the two often land in the same neighbourhood; the difference is who carried the swings.
The rule I use: if the company cannot comfortably fund a month that is double its average without touching money it needs for payroll, ASO is early. If it can, and it has at least two years of its own claims data, ASO is worth modelling properly.
Reviewed by Steffen deGraaf
Steffen brings 20+ years in insurance and group benefits, construction job-site roots, and architectural technology training at Mohawk College. FSRA-regulated insurance broker specializing in Ontario group benefits.
Ontario Insurance
Ontario construction benefits experience
Construction is in Steffen's blood: job sites as a teenager, architectural technology at Mohawk College, and 20+ years in insurance and group benefits for Ontario employers.
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Sources & References
Sources support the distinction between insured and employer-funded arrangements and the need to read the governing documents. Suitability, fees, taxes, pooling, stop-loss, and risk allocation are arrangement-specific and require current written terms.
Health and Welfare Trusts and Employee Life and Health Trusts (2026)
Canada Revenue Agency
View sourceFrequently Asked Questions
Is ASO cheaper than fully insured?
Sometimes, over several years, for a group with stable claims. In any one month it can be cheaper or more expensive. The honest comparison is the same design, the same census, expected claims plus fees plus stop-loss plus tax on one side, premium plus tax on the other, and a bad-month scenario beside both.
What is the difference between ASO and fully insured group benefits?
With a fully insured plan, the insurer carries the insured claims risk under the policy while the employer pays premiums. With an ASO arrangement, the employer funds eligible claims and pays an administrator to process them. Fully insured generally offers more predictable billing; ASO may cost less or more depending on actual claims, fees, taxes, and the protection structure.
Is ASO vs fully insured the same as self-insured vs insured?
They are related terms, but the exact arrangement matters. ASO commonly describes an employer-funded health or dental plan administered by a third party, while other benefits may remain insured or pooled. Read the policy, ASO plan document, and financial agreement to see which party carries each risk.
Who should use an ASO plan?
An employer should consider ASO only when it has credible claims data, enough cash flow for variable claims, a clear governance process, and properly modelled pooling or stop-loss protection. Group size helps assess volatility but is not a universal eligibility rule or a guarantee of savings.
Who should be careful with ASO plans?
Employers with limited cash reserves, incomplete claims data, unclear contract terms, or no model for a high-claims period should be cautious. The advisor should show both structures on a like-for-like basis and explain exactly which risks remain with the employer.
Can a small Ontario business use an ASO plan?
Possibly, subject to provider rules and the proposed structure, but small groups usually have less stable claims experience and less room to absorb volatility. The correct answer comes from written terms and scenario modelling, not a universal employee-count cutoff.
How does AEC Benefits evaluate the ASO vs fully insured decision?
We compare group size, available claims data, plan design, fees and taxes, cash-flow tolerance, pooling or stop-loss, governance, and the employer's appetite for variability. The recommendation follows the written comparison rather than a fixed employee-count threshold.
Want to talk through your options?
If you want real numbers instead of generic plan talk, AEC Benefits can pressure-test pricing, structure, and fit for your team.
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