The Fractional Chief Actuary Model: Why Many Insurers Don't Need a Full-Time Chief Actuary

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Not every insurer needs a full-time Chief Actuary but every insurer needs actuarial leadership.

The rise of the fractional model is redefining how companies access expertise, without the traditional cost or constraints.

Introduction

Most insurers do not need a full-time Chief Actuary. They need what a Chief Actuary does.

For large, top, multiline carriers managing billions in premium in developed countries, that assumption holds. But the insurance landscape of 2025 is far more diverse and structurally varied than the era in which that assumption was formed. Today, thousands of small-to-mid-sized insurers, Managing General Agents (MGAs), captive insurance companies, insurtech startups, and specialty program carriers are asking a fundamentally different question: do we actually need a full-time Chief Actuary, or do we need what a Chief Actuary does?

That distinction between the role and its outputs is at the heart of a rapidly growing model reshaping actuarial practice: the Fractional Chief Actuary. Borrowed from the broader fractional C-suite movement that has already transformed how companies access CFO, COO, and CMO talent, the fractional model offers insurance organizations access to senior actuarial leadership on a part-time, retainer, or engagement-based arrangement. The result is a model that delivers the analytical rigor, regulatory compliance, and strategic insight of a seasoned actuarial leader without the financial commitment, organizational overhead, and talent scarcity challenges of a full-time hire. For a growing segment of the insurance market, the fractional Chief Actuary is the most intelligent deployment of actuarial expertise available.

The Fractional C-Suite: A Model Whose Time Has Come

The fractional executive model is not new but it has achieved remarkable mainstream momentum in recent years. According to a 2024 survey by Toptal, demand for fractional executives grew by 46% year-over-year, with fractional CFOs and CMOs leading the surge particularly among venture-backed companies and firms undergoing digital transformation. The economics are straightforward: full-time C-suite compensation packages including base salary, equity, benefits, and bonuses routinely exceed $300,000 to $500,000 annually for senior roles.

Fractional engagements, by contrast, typically run between $10,000 and $20,000 per month on a retainer basis, representing cost savings of 50% or more compared to a full-time hire. Temporary business management and executive roles have surged by 57% since 2020, driven by tighter funding environments, the normalization of remote and distributed work, and a growing pool of senior executives who prefer portfolio careers over single-employer commitments.

The logic applies with particular force to the role of the Chief Actuary in insurance. The average salary for a Chief Actuary in the United States was approximately $276,861 in 2025, with senior appointments at major carriers reaching significantly higher when total compensation is considered. For a small specialty insurer writing $50 million in annual premium, a captive insurance program with a focused risk mandate, or an insurtech startup navigating its first regulatory filings, committing to a full-time Chief Actuary at that cost level along with the associated benefits, pension, and equity components is difficult to justify. The analytical demands of the role simply do not require full-time presence at these scales. What these organizations need is the episodic, high-value application of senior actuarial judgment: reserve sign-offs, pricing reviews, regulatory submissions, board presentations, and strategic risk advice. That is precisely what the fractional model is designed to deliver.

Who Needs a Fractional Chief Actuary?

The universe of insurers for whom the fractional Chief Actuary model is well suited is broader than many industry participants realize. Small and mid-sized property and casualty carriers particularly those operating in niche or specialty lines represent the most obvious category. These organizations have genuine actuarial needs: annual reserve certifications, rate filings, loss ratio monitoring, and reinsurance program support. But their actuarial workload does not fill a full-time calendar. A seasoned actuary working 2 to 3 days per week on a retainer basis can comfortably fulfill these functions with time to spare.

Managing General Agents occupy an interesting position in this landscape. MGAs write significant volumes of premium but typically do not carry their own insurance risk they operate under binding authority from a carrier. Yet sophisticated MGAs increasingly need actuarial support to develop and maintain their pricing models, demonstrate analytical credibility to capacity providers, and support loss development analysis for program renewal negotiations. An MGA that can show a prospective carrier a robust actuarially-reviewed pricing framework has a measurable competitive advantage. A fractional Chief Actuary provides exactly that capability without the MGA needing to build a full actuarial department.

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Insurtech startups represent perhaps the most critical constituency for the fractional model. As the actuarial profession itself has recognized, an actuary should be one of an insurtech's first strategic hires not because every startup needs a full-time actuarial department, but because no one understands how an insurance company operates financially better than a trained actuary. Navigating rate filings, securing insurance capacity, structuring reinsurance programs, building defensible pricing models for investor due diligence these are tasks that require deep actuarial expertise. One illustrative example: a US-based MGA specializing in cyber liability engaged a fractional Chief Actuary on a 3-day-per-week retainer ahead of a capacity renewal negotiation. The actuary built and documented a defensible pricing framework, attended two carrier meetings, and signed off on the loss development analysis. The MGA retained its capacity on improved terms. Total engagement cost was under $40,000. A full-time hire for the same period would have cost 3 times that figure before benefits.

Fractional InsurTech Actuary firms have already helped startups raise Series B funding rounds by providing end-to-end actuarial support, and have assisted MGA startups in procuring insurance capacity and closing initial capital raises. That is precisely the kind of high-impact, episodic actuarial engagement the fractional model is built for.

Captive insurance companies particularly single-parent captives established by mid-sized corporations to manage their own risk represent another natural fit. Captives require annual actuarial certification of reserves and periodic pricing reviews, but their actuarial workload is inherently bounded by the scope of the parent company's risk program. A fractional Chief Actuary engaged on a retainer or project basis can fulfill the captive's regulatory and governance requirements efficiently and cost-effectively.

The Regulatory Dimension: Appointed Actuary Requirements

One important nuance in the fractional Chief Actuary model is the distinction between the strategic leadership function and the formal Appointed Actuary role that many jurisdictions require. In the United States, state insurance regulations typically require that an insurer filing an actuarial opinion on loss and loss adjustment expense reserves use a Qualified Actuary, a Fellow of the Casualty Actuarial Society or the American Academy of Actuaries who meets specific independence and qualification standards. In the United Kingdom, the PRA's regulatory framework similarly imposes requirements on the Chief Actuary and Actuarial Function Holder.

A Fractional Chief Actuary who holds the appropriate credentials can fulfill these regulatory requirements, just as a part-time medical director at a health insurer can fulfill regulatory requirements for that function. The key is ensuring that the engagement structure is appropriately documented, that the actuary has sufficient access to the organization's data and processes to form a well-reasoned opinion, and that the arrangement meets the specific requirements of the insurer's home jurisdiction. Actuarial consulting firms that specialize in this model have developed robust frameworks for structuring these engagements to meet regulatory standards and regulators in most jurisdictions have become increasingly comfortable with actuarial services delivered through consulting relationships rather than full-time employment.

When Should You Consider a Fractional Chief Actuary?

The clearest signal is a gap between your actuarial obligations and your actuarial workload. If your reserve certifications, rate filings, and pricing reviews do not fill a full-time calendar, you are overpaying for full-time presence. A second signal is a talent access problem: if your geography, budget, or organizational scale makes attracting a credentialed Fellow to a permanent role difficult, the fractional model gives you access to senior talent that would otherwise be out of reach. A third signal is a governance one: if your board audit committee or regulator would benefit from an independent actuarial voice that is not embedded in your management structure, a fractional arrangement provides that objectivity by design.

When the Fractional Model Is Not Enough

Intellectual rigor demands acknowledging the boundaries of the fractional model. For large, complex, multiline carriers particularly publicly traded groups subject to Sarbanes-Oxley requirements, Solvency II capital model governance, or NAIC Own Risk and Solvency Assessment (ORSA) processes a full-time Chief Actuary with deep organizational embedding, continuous availability, and close integration with finance, underwriting, and risk management teams is genuinely necessary. The volume and complexity of actuarial work at this scale cannot be meaningfully compressed into a part-time engagement. Similarly, insurers navigating rapid portfolio growth, M&A transactions, or major regulatory investigations may need full-time actuarial leadership during those periods of heightened demand.

The honest assessment is that the fractional model occupies a specific band of the market organizations large enough to have genuine actuarial obligations but not yet at the scale where those obligations require a full-time commitment. That band is broader than many industry participants assume, encompassing several thousand insurance entities in the U.S. market alone.

Conclusion

The fractional Chief Actuary model will not suit every organization. But for the thousands of insurers, MGAs, captives, and insurtechs sitting in the space between genuine actuarial need and full-time actuarial justification, it is the most rational deployment of senior expertise available. The economics are clear. The governance case is sound. The only remaining question is whether your organization has the appetite to move away from a hiring convention that was built for a different era of the industry.

I’ve been working closely with insurers and startups in this capacity, providing fractional Chief Actuary and Appointed Actuary support where full-time roles are not practical. The model is simple: senior-level expertise, applied where it matters most, without the overhead of a full-time hire.

If this is something you're exploring, feel free to reach out (just reply to this message); happy to share how this can be structured in practice.

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