Solvency II, the ICS and global capital rules

Solvency II is the European Union's risk-based capital and supervision regime for insurers and reinsurers. It sets how much capital an insurer must hold against the risks it runs, how it must govern itself and what it must disclose. The U.S. does not use Solvency II; it relies on state-based statutory accounting and the NAIC's risk-based capital formulas, while the International Association of Insurance Supervisors (IAIS) has developed a global Insurance Capital Standard (ICS) for the largest cross-border groups. For a U.S. business buyer, the differences matter mainly when your insurer or its reinsurers are headquartered abroad.

Solvency II in brief

Solvency II took effect in the EU in 2016 and is organized as three pillars.

1. Pillar 1: capital. The Solvency Capital Requirement (SCR) is calibrated to a 99.5% one-year value-at-risk: the insurer should hold enough own funds to survive a loss that is expected to occur no more than once in 200 years. The Minimum Capital Requirement (MCR) is a lower floor; breaching it triggers the sharpest supervisory action. Assets and liabilities are valued on a market-consistent basis, with technical provisions made up of a best estimate of future cash flows plus a risk margin.
2. Pillar 2: governance. Insurers must run their own risk and solvency assessment (ORSA), have key functions (risk, compliance, actuarial, internal audit) and meet fit-and-proper tests.
3. Pillar 3: disclosure. Public solvency and financial condition reports and detailed reporting to supervisors.

The ratio you will see in an insurer's report, such as "solvency ratio of 200%," is eligible own funds divided by the SCR.

The 2025 amendments

The EU has reformed the regime. The amending Directive (EU) 2025/2 updates the Solvency II framework, and EIOPA, the EU's insurance supervisor, states that the new rules take effect on 30 January 2027 (EIOPA, Solvency II). Commentary from advisory firms describes the directive as published in the Official Journal on 8 January 2025 with a transposition period of two years, and the European Commission published the final delegated regulation with the detailed technical rules in October 2025 (per the Actuarial Association of Europe). The reform aims to:

• encourage long-term and equity investment through changes to the volatility adjustment and the treatment of risk;
• recalibrate the risk margin;
• simplify rules for smaller insurers through stronger proportionality;
• add macroprudential tools and recovery and resolution planning;
• improve cross-border supervision and address climate-related risk.

The practical effect is that capital requirements of EU insurers will move modestly and their disclosures will change in 2027. Details of each change are in the Directive and delegated regulation; consult the Official Journal rather than a summary for any decision that depends on a calculation.

The Insurance Capital Standard

The IAIS, the global standard-setter, developed the ICS as a group-wide prescribed capital requirement for internationally active insurance groups (IAIGs), as the quantitative part of its common framework for supervising such groups. The IAIS Executive Committee approved the final ICS for adoption by IAIS members in November 2024, when it also concluded that the U.S. Aggregation Method (AM) provides a basis for comparable outcomes (IAIS press release, November 2024). The assessment noted areas for further work, such as the treatment of interest rate risk and the timing of supervisory intervention.

Two consequences follow. First, the ICS is a group standard; it sits on top of, not in place of, the legal-entity capital rules a regulator imposes on a particular insurer. Second, the U.S. approach is the NAIC's group capital calculation, which aggregates the capital of each legal entity in a group rather than consolidating on a single market-consistent basis. The Federal Insurance Office is the federal representative at the IAIS and published a November 2024 report on the ICS's impact on U.S. consumers and markets (The Federal Insurance Office and federal reach).

How the U.S. system differs

Statutory accounting does not value assets and liabilities the way Solvency II does, so an RBC ratio and a Solvency II ratio cannot be compared directly. Neither is a rating; each is a regulatory minimum. See risk-based capital: how regulators measure insurer strength for the U.S. details.

Why a U.S. business buyer should care

• Global insurers. If your policy is issued by a U.S. subsidiary of a European or Bermuda group, regulators supervise the U.S. entity; the parent's capital rules matter for group strength and for reinsurance support. Lloyd's, which uses its own central solvency approach (central solvency ratio 496% for fiscal year 2025, per Lloyd's results) is an example of a market where the capital rules affect capacity (How Lloyd's of London works: syndicates, brokers and what it means for you; Lloyd's).
• Reinsurance. U.S. insurers cede risk to reinsurers in the EU, UK and Bermuda. Collateral rules and covered agreements shape the reinsurance cost that eventually flows into premiums (what is reinsurance, and why it affects your business premium; The Bermuda insurance and reinsurance market).
• Capacity. If new EU capital rules loosen requirements for long-term investments or reduce the risk margin, some insurers may redeploy capital. If rules tighten, they may cut back. The effect on U.S. commercial pricing is indirect and hard to isolate.
• Credit and reporting. Rating agencies use their own capital models alongside regulatory ratios. A buyer should check the insurer's rating directly (AM Best ratings explained for business buyers).

A hypothetical

Say a Texas oil-services company buys a $25 million excess liability layer from the U.S. subsidiary of a European group, reinsured with its parent in Zurich. The U.S. subsidiary's capital adequacy is measured by its state regulator under RBC. The parent's solvency is assessed by its home supervisor under a regime similar to Solvency II. For the buyer, the questions are: what is the subsidiary's rating, is there a parental guarantee or only reinsurance, and which regulator would act if it failed. Ask the broker for that structure in writing.

Key takeaways

• Solvency II is the EU's capital and supervision regime built on a 99.5% one-year SCR; amendments under Directive (EU) 2025/2 apply from 30 January 2027, according to EIOPA.
• The IAIS approved the Insurance Capital Standard for adoption by members in November 2024 and found the U.S. Aggregation Method can produce comparable outcomes.
• U.S. insurers are supervised by states using statutory accounting and RBC, not Solvency II.
• Capital ratios from different regimes are not comparable and none is a quality rating.
• For your own policy, look at the issuing entity, its rating and who stands behind it.