In a move that fundamentally altered the mutual insurance sector, ZorgSamen, a Dutch health mutual with roughly 180,000 members, put a fundamental question to its membership: should the premium pool be split into two separate risk funds, one for members under 40 and another for those 40 and older? The proposal, driven by a board concerned about rising claims from an aging demographic and the threat of younger members leaving for cheaper plans, passed by a narrow majority. The result has effectively ended the cross-subsidy that had long stabilized premiums across age groups, and it has created a laboratory for risk segmentation within a mutual structure.

A Mutuality Betrayed by Its Own Bylaws

ZorgSamen was founded in the 1970s as a solidarity-based mutual, pooling risk across all members regardless of age or health status. For decades, that model worked well: a broad base of young, healthy members subsidized the higher claims of older members, and the mutual enjoyed stable, competitive premiums. But by 2022, the arithmetic had shifted. The mutual's membership was aging faster than the national average, and younger members, often employed in gig or tech sectors with thin margins, began shopping for cheaper, for-profit plans. The board faced a classic mutual dilemma: raise premiums across the board and risk losing the young, or let the old pay more and risk fracturing the solidarity principle.

The board's solution was radical: propose a split of the premium pool into two risk funds, each with its own premium structure, claims experience, and reinsurance treaties. The proposal required a membership vote, as the mutual's bylaws mandated member approval for any change to the risk-pooling basis. The campaign was contentious. Older members, many of whom had belonged to ZorgSamen for decades, argued the split violated the mutual ethos. Younger members, organized via social media, countered that they were being asked to pay for a demographic problem not of their making. The vote passed with 52% in favor, but the margin was so narrow that the board agreed to a five-year review clause.

The split took effect on January 1, 2026. Fund A covers members under 40; Fund B covers those 40 and older. Each fund is legally a separate risk pool within the same mutual, with its own premium rates, claims reserves, and reinsurance arrangements. Administrative costs are shared proportionally, but claims experience is tracked separately. The board argued that this structure would allow the mutual to retain younger members by offering them market-competitive premiums while still providing older members with the stability of a mutual, albeit at higher cost.

Critics, including some consumer advocacy groups, argued that the split effectively creates two tiers of mutuality, undermining the very principle of solidarity that distinguishes mutuals from stock insurers. But the board maintained that without the split, the mutual would have faced a death spiral: as younger members left, the remaining pool would become older and sicker, driving premiums up further and accelerating departures. The split, they argued, was a pragmatic adaptation, not an abandonment of mutuality.

The Mechanics of Segregation: How Two Pools Operate

Operationally, the two funds are distinct but intertwined. Fund A, with roughly 70,000 members, has a lower claims ratio, reflecting the younger demographic. Its premium rates are roughly 15–20% lower than the pre-split blended rate. Fund B, with about 110,000 members, has a higher claims ratio, and its premiums are about 10–12% higher than the old blended rate. Each fund files its own regulatory returns under Solvency II, and each has its own risk margin and capital requirement.

Reinsurance treaties are now tailored per fund. Fund A, with its low-risk profile, attracted competitive quotes from reinsurers eager for diversified, low-correlation business. Fund B, by contrast, required more expensive excess-of-loss coverage, as its claims distribution is more skewed toward high-cost chronic conditions. Some reinsurers offered a combined treaty with a discount, but ZorgSamen opted for separate treaties to maintain transparency. The mutual also purchased equipment breakdown reinsurance for Fund B, which includes many members in industrial trades, a line that has become more complex as machinery becomes digitized and interconnected.

Administratively, the two funds share the same claims processing system, customer service team, and wellness programs. But actuarial modeling is now done separately, with distinct assumptions about morbidity, mortality, and lapses. The board established a cross-fund stabilization reserve, funded by a small levy on both pools, to cover unexpected shocks that might affect one pool disproportionately. That reserve, however, is capped at a modest percentage of total premiums, limiting its ability to smooth large disparities.

Solvency II capital requirements differ between the funds. Fund A, with lower risk, holds capital at roughly 110% of the Solvency Capital Requirement (SCR), while Fund B holds 130%, reflecting its higher claims volatility. The mutual's overall solvency ratio remained above 150%, but the split introduced new complexity in capital management. Regulators at the Dutch Central Bank (DNB) reviewed the split for fairness and approved it, but mandated that marketing materials clearly disclose that the two funds are separate and that premiums are determined by age group, not individual health status.

Premium Flow: Winners and Losers in the Split

The most immediate effect of the split was on premiums. Younger members saw their premiums drop by roughly 15–20%, making ZorgSamen competitive with for-profit health insurers targeting the under-40 demographic. For a typical 28-year-old single member, the annual premium fell from roughly €1,800 to about €1,500. That reduction was enough to stem the outflow: the mutual reported that member retention among under-40s improved from 82% in 2025 to 91% in the first half of 2026.

Older members, however, faced a steeper bill. A 55-year-old member saw premiums rise from roughly €2,400 to about €2,700 annually, an increase of roughly 12.5%. For those on fixed incomes, the increase was painful. Some older members threatened to switch to competitors, but many stayed, citing loyalty to the mutual and the comprehensive coverage. ZorgSamen introduced a loyalty discount for Fund B members with ten or more years of continuous membership, which softened the blow for long-time members.

Employers offering group plans through ZorgSamen faced a new complexity. Previously, a company could offer a single group rate for all employees. Now, group plans are offered per-fund, meaning a company with a mix of ages must either offer two separate plans or pay a blended rate that the mutual calculates based on the age distribution of the employee group. Some large employers, particularly in tech and finance, opted for Fund A-only plans for their predominantly young workforces, effectively excluding older workers from the group plan. That raised concerns about age discrimination, though the mutual noted that older workers could still enroll individually in Fund B.

The elimination of the cross-subsidy had a clear distributional effect. Younger members, who had been paying more than their actuarial risk, now pay less. Older members, who had been paying less than their risk, now pay more. The mutual's actuaries calculated that the pre-split cross-subsidy amounted to roughly €300 per younger member per year, a transfer that has now been unwound. For the mutual as a whole, the premium volume remained stable, but the composition shifted: Fund A now accounts for about 35% of total premiums, down from 40% before the split, as the younger pool shrank slightly due to the initial exodus before the split took effect.

Regulatory Reaction and Industry Precedent

The Dutch Central Bank's approval of the split was not automatic. Regulators scrutinized the proposal for potential adverse selection and fairness concerns. They required ZorgSamen to demonstrate that the split would not lead to a death spiral for Fund B, and that the mutual had adequate safeguards to prevent cherry-picking. The approval came with conditions: ZorgSamen must publish annual reports on the claims experience of each fund, and it must conduct a member survey every two years to gauge satisfaction and understanding of the fund structure.

Since the split, at least two other Dutch mutuals have approached DNB with similar proposals, though neither has yet gone to a membership vote. A Belgian mutual insurer has publicly stated it is monitoring the ZorgSamen experiment, and the Belgian regulator has issued a discussion paper on risk segmentation within mutuals. The European Insurance and Occupational Pensions Authority (EIOPA) has taken note, though it has not issued formal guidance. The EU's Solvency II framework does not explicitly prohibit age-based risk segmentation within mutuals, as long as the segmentation is actuarially justified and transparent.

Consumer advocates have raised concerns that the split could set a precedent for further fragmentation. If mutuals begin segmenting by age, they ask, what stops them from segmenting by health status, occupation, or postal code? The board of ZorgSamen has argued that age is a reasonable and transparent criterion, unlike health status, which could lead to discrimination against the sick. But the line may be blurry: in the future, a mutual might propose a fund for members with chronic conditions, effectively creating a high-risk pool within a mutual structure.

Regulators in other European countries are watching closely. In Germany, where mutuals dominate the health insurance market for civil servants, the idea of age-based risk funds has been debated but not implemented. In France, mutuals are prohibited from setting premiums based on age, but the ZorgSamen model could prompt a re-examination of that rule. The split has also caught the attention of the International Cooperative and Mutual Insurance Federation (ICMIF), which has scheduled a panel discussion on the topic at its next annual meeting.

Reinsurance and Capital Implications

The split has had significant implications for ZorgSamen's reinsurance program. Before the split, the mutual purchased a single quota-share treaty covering the entire portfolio, with a 50% cession to a panel of reinsurers. After the split, the mutual restructured its reinsurance to reflect the different risk profiles of the two funds. Fund A now uses a quota-share treaty with a 40% cession, reflecting its lower risk and the reinsurers' appetite for such business. Fund B uses an excess-of-loss treaty with a retention of €1 million per claim, above which the reinsurer covers 90% of losses up to €10 million.

The cost of reinsurance for Fund B is roughly double that for Fund A on a per-premium basis. Several reinsurers submitted quotes for a combined treaty, but the mutual chose separate treaties to maintain pricing transparency and to avoid cross-subsidization between the funds. The mutual also purchased equipment breakdown reinsurance for Fund B, as many older members work in manufacturing and construction, where machinery breakdowns can lead to business interruption claims. As equipment breakdown risks become more complex and interconnected, carriers need reinsurance partners that deliver engineering expertise, technical insight and long-term strategic support — not just capacity.

The capital implications are also notable. Fund A's lower risk profile means it requires less capital under Solvency II, freeing up capital that the mutual can deploy elsewhere. Fund B's higher risk profile requires more capital, but the mutual's overall capital position remains strong. The mutual has considered issuing a catastrophe bond to cover tail risks for Fund B, but has not yet done so.

For Fund A, the low-risk profile has attracted interest from capital markets. Some investors have approached ZorgSamen about offering insurance-linked securities (ILS) tied to Fund A's claims experience, but the mutual has been cautious, wary of the complexity and potential loss of control. The mutual's CFO noted that while ILS could provide cheaper capital, the mutual's governance structure requires member approval for such innovations, which could be a hurdle.

Member Sentiment and Retention Challenges

Member sentiment has been mixed. A survey conducted by the mutual in mid-2026 found that 70% of Fund A members were satisfied with the new structure, citing lower premiums and the feeling that they were no longer subsidizing older members. Among Fund B members, satisfaction was lower: only 45% were satisfied, and 60% said they felt "singled out" by the age-based split. The mutual has responded by enhancing its wellness programs, which are available to all members but are particularly promoted to Fund B. The mutual cited a 2023 study by von Bonsdorff et al. in the Journal of Occupational Health Psychology, which found that targeted exercise and comprehensive wellness programs can aid workers in their careers as they age.

Retention in Fund B has been a challenge. The mutual introduced a loyalty discount for members with ten or more years of continuous membership, which reduced the effective premium increase for long-time members. It also launched a "health partner" program, where members with chronic conditions receive personalized coaching and support. Early results show that churn in Fund B has stabilized at around 8% annually, slightly higher than the pre-split rate of 6%, but lower than the board had feared.

Younger members, while generally satisfied, still grumble about administrative overhead. Some have pointed out that the mutual's expense ratio is higher than that of for-profit competitors, and they question whether the mutual structure offers any real advantage. The board has responded by investing in digital tools to streamline claims and customer service, but the expense ratio remains a point of contention.

The mutual has also faced criticism from some older members who feel the split was undemocratic. The narrow vote margin has fueled calls for a revote, but the board has declined, citing the five-year review clause. Some members have formed a "Solidarity Caucus" that advocates for a return to a single pool, arguing that the mutual's founding principles have been betrayed. The caucus has threatened to propose a bylaw amendment at the next annual meeting, which could force another vote.

Lessons for Mutual Insurers Everywhere

The ZorgSamen experiment offers several lessons for mutual insurers facing similar demographic pressures. First, demographic shifts force hard choices on risk pooling. A mutual that cannot adapt to an aging membership may face a death spiral, but the adaptation must be handled transparently and with member input. The ZorgSamen vote, while contentious, was a democratic process that gave members a voice in the decision. That transparency, while painful, may have built trust in the long run.

Second, reinsurance structuring must adapt to segmented portfolios. The separate treaties for Fund A and Fund B allowed the mutual to optimize pricing and coverage, but it also introduced complexity and higher costs for the older pool. Mutuals considering similar splits should engage reinsurers early and model the impact on capital and solvency.

Third, regulatory sandbox approaches could help test similar splits without permanent commitment. The Dutch regulator's approval with conditions — including regular reporting and member surveys — provides a model for other jurisdictions. A sandbox approach would allow mutuals to experiment with risk segmentation for a limited period, with a sunset clause if the experiment fails.

Finally, the ZorgSamen outcome may reshape mutual governance norms. The narrow vote margin and the subsequent formation of a dissident caucus show that such splits are deeply divisive. Mutuals considering similar moves should prepare for a prolonged internal debate and consider whether the benefits of segmentation outweigh the risks to member cohesion. The future of the ZorgSamen model will depend on how well the mutual manages the tension between actuarial fairness and solidarity, and whether other mutuals adopt or reject the approach.

This article is for informational purposes only and does not constitute professional insurance, legal, or financial advice. Readers should consult qualified professionals for advice tailored to their circumstances.