US Insurance Regulators Take the Capital Charge Back from the Rating Agencies
The capital a US insurer must hold against a private asset is being re-derived by the regulator rather than read off a credit rating, with three NAIC instruments biting on the 31 December 2026 balance sheet. Exposed: life insurers, private-credit managers, CLO arrangers and rating agencies.
The consensus argument about insurers and private credit is an argument about credit quality. Life insurers' holdings have more than doubled in a decade, the assets are illiquid and hard to price, and the fear is a real default cycle. Underneath that, something narrower has moved. Three separate NAIC instruments now sit between a credit rating and the capital charge it produces, and all three land on the 31 December 2026 balance sheet. The rating still exists; it has stopped being the answer. Required capital on a private asset can rise without a downgrade, a default, or any change in the asset itself, and most capital plans are built as though it cannot.
Signal Identification
A regulatory pivot with a governance problem inside it. The instrument is not a rule about what insurers may buy but a rule about who converts what they own into a number. Assurance moves from a market participant paid by the issuer to a standard-setter with no market discipline. The exposure is capital planning, asset selection and legal challenge at once.
What's Changing
Three instruments, adopted separately, converge. Since January the NAIC has held the power to challenge and override a filing-exempt rating that differs from its own analysis by more than three notches, across public and private ratings (Insurance Business, 12/06/2026). On 23 June its risk-based capital group adopted new C-1 factors for CLOs effective for reporting as of 31 December 2026, with tranche thickness “measured on a current basis, using the most recent trustee report” rather than at origination (Sidley Austin, 09/07/2026). And the due diligence rules governing which rating providers may be relied on at all return for exposure on 23 September (NAIC, accessed 14/09/2026).
The direction is not uniformly upward. Senior investment-grade tranches generally see lower charges than the corporate-bond treatment they replace, particularly AAA through A, while an 11.77% pretax surcharge lands on below-investment-grade broadly syndicated CLO tranches of 4% thickness or less, and the 45% charge on residual tranches stays (Sidley Austin, 09/07/2026). What changed is the logic, not the level: capital now turns on where a tranche sits and how thick it is, so “similar ratings would not necessarily produce similar RBC outcomes” (DLA Piper, 30/06/2026).
The book being regraded is large, and what insurers report about it has just been shown to be unreliable. Senator Elizabeth Warren's 11 September letter to the NAIC cites its own data putting life insurers' private credit at $849 billion in 2024 against $386 billion in 2014, and follows Delaware Life's restatement of related-party holdings from about $1.4 billion, roughly 3% of investments, to more than $17 billion, upwards of 39% of invested assets (Insurance Business, 11/09/2026). CLOs alone accounted for $276.8 billion at the end of 2024, about 5.1% of insurer bonds (NAIC, 01/04/2026).
Where the regulator has cut into the chain from asset to capital charge
Sources: NAIC data cited in Senator Warren's letter of 11 September 2026, reported by Insurance Business; the NAIC issue brief of April 2026 for the CLO figure; Sidley Austin and the NAIC Credit Rating Provider Working Group for the gates and dates.
Disruption Pathway
Stage one runs to the end of 2026 and is mechanical. Insurers file 31 December risk-based capital on the new CLO factors, thickness read off current trustee reports, while the due diligence rules for rating providers close their exposure round. Stage two runs through 2027 and 2028, where discretion becomes visible: the first challenges to filing-exempt ratings, the first contested designations, the collateral-loan look-through at the 31 December 2027 filing, and the thickness logic migrating to rated feeders and other asset-backed structures, which DLA Piper expects (DLA Piper, 30/06/2026). Stage three is the legal test, when a domiciliary regulator first overrides a rating an insurer priced an acquisition on.
Stress concentrates in three places. Valuation is the first: bonds carrying private placement numbers reached 23.4% of insurers' admitted bonds in 2025 against 18.3% in 2021, and positions with the least market evidence are hardest to defend when a regulator asks (Insurance Business, 12/06/2026). Concentration is the second, with five asset managers accounting for a third of global private-credit loan commitments, so one re-grading travels at once (Chatham House, 15/07/2026). Liability is the third, because a designation that can be contested is a judgement someone owns. Two adaptations follow. Origination moves upstream, with tranche sizing negotiated for insurance capital treatment at issue rather than at purchase. And insurers build internal shadow-designation capability, because whoever models the charge before the regulator does can price the asset.
Why This Matters Now
This lands on life insurance boards and chief investment officers, on the alternative managers whose insurance balance sheets fund their origination, on rating agencies whose regulatory franchise is being made conditional, and on the analysts who model insurer capital. The decision architecture that needs revising treats the credit rating as the capital input and the capital charge as a stable function of it. Neither holds from the 31 December filing onward. Insurers should model required capital under adverse designation outcomes as well as adverse credit outcomes, and should know today which positions sit three or more notches from a plausible regulatory view. Taken together, the sources suggest capital plans resting on ratings alone will break first, and quietly, in a filing rather than in a market.
Decision-action posture for this signal: Prepare — the discretion power is in force and the CLO factors are adopted, but the systems to operate a challenge are still being built and the due diligence rules re-enter exposure on 23 September, so positions should be sized against the first contested designations rather than committed against mechanics that are still moving.
Counter-Argument
The strongest objection is that this is calibration dressed as a change of regime, and that the evidence never supported it. Powell and Morris find that life insurers with larger private-debt allocations show stronger financial profiles rather than weaker, conclude that “the available evidence therefore does not support the view that private credit creates risks existing insurance regulation fails to capture”, and note that the CLO recalibration “was not motivated by poor historical performance” (International Center for Law & Economics, 05/06/2026). The NAIC's own brief records about 80% of insurer CLO holdings as investment grade or better (NAIC, 01/04/2026).
That may be right about the motive and still leave the consequence standing. A power used rarely still changes how every position is underwritten, because a three-notch challenge must be priced whether or not it is exercised. And the CLO factors involve no discretion at all: they apply to the whole $276.8 billion book at the 31 December filing, on mechanics no rating agency controls.
Implications
This is durable rather than cyclical, because it relocates an authority rather than adjusting a number. Once a designation is a regulatory judgement that can be contested, it does not revert to being a purchased opinion, and the NAIC states plainly that it “has adopted a discretion process to challenge ratings for regulatory use when they do not reasonably reflect investment risk” (NAIC, 01/04/2026). The inflection window runs from the 31 December 2026 filing to the first contested designation. Insurers with modelling capability, thick senior positions and clean valuation evidence gain. Holders of thin subordinated tranches, affiliated paper and assets with little market evidence lose, and they lose before any borrower misses a payment.
Early Indicators to Monitor
- The first SVO challenge to a filing-exempt rating that reaches a domiciliary regulator for decision, and whether the designation moves.
- The revised rating-provider due diligence proposal being adopted rather than re-exposed again after the 23 September 2026 meeting.
- A life insurer disclosing a designation-driven capital movement, separate from credit migration, in a 31 December 2026 filing or a Q1 2027 call.
- The thin-tranche surcharge logic extended to middle-market CLOs, rated feeder funds or other asset-backed structures.
- A CLO arranger sizing a tranche above 4% thickness explicitly to avoid the surcharge, visible in new-issue documentation.
Disconfirming Signals
- The NAIC deferring or withdrawing the discretion process rather than operationalising it, leaving filing-exempt ratings automatic.
- A full year to the end of 2027 passing with no filing-exempt rating actually challenged.
- Grandfathering of existing holdings, so the new CLO factors apply only to assets acquired after adoption.
- An Agreement State or a domiciliary regulator declining to give a NAIC designation effect where it diverges from the rating.
- Aggregate industry capital ratios moving less than a point on the 31 December 2026 filing, with dispersion across insurers unchanged.
Strategic Questions
- Do we model capital against adverse designations, or only against adverse credit?
- Which of our positions sit three or more notches from a plausible regulatory view today?
- Should we build an internal designation model now, or buy the answer from the arranger?
- At what share of privately rated assets does designation risk outrank spread in our mandate?
Keywords
NAIC designation; filing exempt; SVO discretion amendment; credit rating provider due diligence; risk-based capital; CLO C-1 factors; tranche thickness; private letter ratings; life insurer private credit; rated feeder funds; regulatory capital arbitrage; insurer solvency
Bibliography
Source tiers: Tier 1, governments, regulators and intergovernmental bodies. Tier 2, think-tanks, academic institutes, major consultancies and quality data providers. Tier 3, quality journalism and specialist trade press. Tier 4, vendor, company and practitioner sources, used only as directional corroboration.
- Tier 1 How state insurance regulators are responding to growth in CLOs and private credit. NAIC (01/04/2026).
- Tier 1 Credit Rating Provider (E) Working Group: 2026 charges, exposure drafts and meeting schedule. Evergreen reference page, accessed 14/09/2026. NAIC (accessed 14/09/2026).
- Tier 2 Regulatory update: NAIC adopts new risk-based capital charges for collateral loans and collateralized loan obligations. Sidley Austin (09/07/2026).
- Tier 2 NAIC moves to adopt new RBC factors for CLO investments. DLA Piper (30/06/2026).
- Tier 2 Financial regulators need to get ahead of the curve on private credit. Chatham House (15/07/2026).
- Tier 2 Private credit and life-insurer solvency: evidence for a calibrated regulatory approach. International Center for Law & Economics (05/06/2026).
- Tier 3 Insurers are funding AI infrastructure, and the NAIC wants to know if the ratings hold up. Insurance Business (12/06/2026).
- Tier 3 Warren presses insurance regulators for answers on private credit ties as Walter probe widens. Insurance Business (11/09/2026).