Life Insurance: Long-Duration Liabilities and Investment Returns

Introduction

Life insurance is, at its core, an investment management business structured around long-duration risk transfer. Unlike P&C insurance (where policies are typically annual and claims settle within 1-3 years), life insurance policies span decades: a whole life policy sold to a 30-year-old may not pay a death benefit for 50+ years, and a deferred annuity may accumulate for 30 years before entering the payout phase. This extraordinary duration creates a business model in which investment portfolio management is as important as (and often more important than) the underwriting of mortality and longevity risk.

US life and annuity insurers generated approximately $822.6 billion in net premiums written in 2024, with annuity considerations reaching $364.6 billion (up 18.6% year-over-year) and representing nearly 56% of direct premiums. Individual life insurance new premiums hit a record $16 billion in 2024, the fourth consecutive year of record sales. With general account assets of approximately $4.5 trillion, life insurers are among the largest institutional investors in the world, and how they manage those assets determines profitability far more than mortality experience in most years.

For FIG bankers, life insurance is one of the most analytically demanding subsectors. It requires understanding actuarial concepts (mortality tables, lapse rates, policyholder behavior), investment management (asset-liability matching, credit risk, duration management), and unique accounting frameworks (LDTI under US GAAP, statutory accounting, embedded value). Life insurance M&A, including block transactions and PE-backed reinsurance deals, generates significant FIG advisory revenue.

Life insurance products span a spectrum from pure protection (term life) to pure investment (fixed annuities), with hybrid products (whole life, universal life) combining both elements. Each product type creates different liability characteristics and investment requirements.

Term life is the simplest product: pure death benefit protection with no cash value. The insurer collects level premiums for 10, 20, or 30 years and pays a benefit if the insured dies during the term. Term policies are highly profitable because mortality rates for working-age adults are low, and most term policies lapse (expire without a claim) before the insured dies. Term insurance generates limited investment income because there are no policyholder reserves to invest (reserves are much smaller than for whole life or annuities).

Whole life provides permanent coverage with a guaranteed cash value that grows at a fixed rate. The insurer must invest reserves to support both the death benefit guarantee and the cash value growth guarantee, creating a substantial investment portfolio need. Whole life represented 36% of new life premiums in 2024, its lowest market share since 2014 as indexed products gained popularity.

Universal life products (fixed UL, indexed UL, variable UL) offer flexibility in premiums and death benefits, with cash values linked to either a credited rate, an equity index, or direct market investment. Indexed universal life (IUL) set new quarterly and annual sales records in 2024, driven by consumer demand for equity-linked upside with downside protection.

Annuities are investment products that guarantee income payments, either immediately or after an accumulation period. Annuity considerations reached $364.6 billion in 2024 (up 18.6%), making annuities the dominant product category for life insurers. Fixed indexed annuities (FIAs) have been the fastest-growing segment, particularly among PE-backed insurers.

Long-Duration Liability

A financial obligation that extends over many years or decades, requiring the insurer to maintain reserves and investment assets to meet future payments. In life insurance, long-duration liabilities include death benefit reserves (held until the policyholder dies), annuity accumulation reserves (held until the annuity enters the payout phase), and payout annuity reserves (held until all payments are made). The defining characteristic is that the insurer cannot reprice the product once issued: a whole life policy sold in 2025 locks in mortality charges and cash value growth rates for the life of the insured. This means the insurer must accurately predict mortality, lapse rates, expenses, and investment returns over a 30-50+ year horizon when pricing the product. Pricing errors compound over decades, making life insurance one of the most actuarially demanding businesses.

Life insurers earn the spread between the investment returns on their general account assets and the guaranteed rates credited to policyholders. This spread is the primary driver of life insurer profitability.

Asset-Liability Matching (ALM)

The central discipline of life insurance investment management is matching the duration and cash flow characteristics of the investment portfolio to the liability profile. A life insurer with an average liability duration of 12 years should hold a portfolio of assets with a similar duration, so that changes in interest rates affect assets and liabilities roughly equally.

In practice, perfect matching is impossible: life insurance liabilities have embedded options (policyholders can lapse, surrender, or exercise guaranteed minimum benefits) that create duration uncertainty. Investment managers must therefore maintain a portfolio that is approximately matched while retaining enough liquidity and flexibility to manage policyholder behavior risk.

Portfolio Composition

Life insurer general accounts are dominated by fixed-income investments, but the composition has shifted significantly in recent years:

Investment-grade corporate bonds remain the core allocation (typically 35-45% of general account assets), providing spread income above Treasuries with manageable credit risk.

Structured products (CMBS, RMBS, CLOs, ABS) represent a growing share (15-25%), particularly for PE-backed insurers that have the origination and structuring capabilities to access these markets efficiently.

Private credit and direct lending have grown rapidly as life insurers seek illiquidity premiums. Life insurers are among the largest providers of private credit in the US, with holdings estimated at over $800 billion. The long-duration, predictable nature of life liabilities makes them natural holders of illiquid, long-dated credit assets.

Real estate and infrastructure provide inflation-linked returns and stable cash flows that match well with long-duration liabilities.

Equities represent a small allocation (typically 2-5% of general accounts), constrained by RBC charges and the need for asset-liability matching.

The most transformative trend in life insurance over the past decade has been the entry of private equity firms as owners and operators of life insurance platforms. Apollo (through Athene), KKR (through Global Atlantic), Blackstone, Carlyle, and other alternative asset managers have acquired or built life insurance platforms that combine insurance liabilities with alternative investment management.

The model works as follows: the PE-backed insurer acquires blocks of annuity or life insurance liabilities (either through reinsurance transactions, block acquisitions, or organic annuity sales), then invests the associated reserves in a portfolio that includes a higher allocation to private credit, structured products, and alternative assets than traditional life insurers typically hold. The PE firm earns both insurance spread income and asset management fees on the invested assets.

Athene, Apollo's insurance platform, held over $300 billion in total assets as of early 2025. Global Atlantic, acquired by KKR in 2024, manages over $150 billion. These platforms have grown rapidly through a combination of organic annuity sales and reinsurance block acquisitions, in which they assume liabilities (and receive the associated investment assets) from traditional life insurers that want to shed capital-intensive product lines.

Block Transaction

A transaction in which a life insurer sells or reinsures a closed block of insurance policies (typically fixed annuities, universal life, or long-term care) to another insurer or reinsurer. The buyer assumes the liabilities (future claims and guaranteed benefits) and receives the investment assets backing those liabilities. Block transactions are a major source of FIG deal flow: traditional life insurers sell blocks to free up capital, exit unprofitable product lines, or simplify their business; PE-backed platforms buy blocks to grow their assets under management and earn spread income through active investment management. Block transactions are complex, requiring actuarial analysis of the liabilities, investment analysis of the assets, and regulatory approvals from state insurance departments. They are typically structured as reinsurance agreements (coinsurance, modified coinsurance, or funds-withheld arrangements) rather than outright asset purchases.

Life insurance companies are among the most complex financial institutions to value, primarily because the economic value of a life insurance company is locked in its existing policies (which will generate cash flows over decades) rather than in current-year earnings.

Embedded Value (EV)

The primary valuation methodology for life insurers is embedded value, which captures the present value of future profits from in-force policies. EV consists of two components:

Adjusted net asset value (ANAV): the tangible equity of the company, adjusted for the difference between statutory reserves and economic reserves (since statutory accounting tends to be more conservative than economic reality).

Value of in-force business (VIF): the present value of expected future distributable earnings from existing policies, discounted at a risk-adjusted rate. This is the actuarial projection of how much profit the current policy portfolio will generate over its remaining life.

EV is conceptually similar to DCF analysis but applied to insurance liabilities rather than corporate cash flows. The P/EV multiple (share price divided by embedded value per share) is the key valuation metric, analogous to price-to-book for banks.

LDTI: The Accounting Transformation {#ldti-accounting}

In 2023, US life insurers adopted FASB's Long-Duration Targeted Improvements (LDTI) standard, the most significant change to life insurance accounting in decades. LDTI requires insurers to update actuarial assumptions (mortality, lapse, expense) at each reporting date and recognize the impact of changes in current-period earnings. Previously, assumptions were "locked in" at policy issue and rarely updated.

The impact is significant: earnings under LDTI are more volatile (because assumption updates flow through income), but the balance sheet is more transparent (because reserves reflect current best estimates rather than original pricing assumptions). For FIG analysts, LDTI complicates period-over-period earnings comparisons but provides a more accurate picture of the economic position of the liability portfolio.

The European life insurance market operates under a parallel but distinct regulatory and accounting framework. IFRS 17, adopted across the EU in January 2023, serves a similar purpose to LDTI: requiring insurers to update liability assumptions at each reporting period and provide more transparent reserve reporting. Under IFRS 17, European life insurers valued 86% of their liabilities using the variable fee approach (VFA), which explicitly recognizes investment return sharing between insurer and policyholder. EIOPA's analysis found that IFRS 17 life insurance liabilities (excluding the contractual service margin) were on average 2.5% lower than corresponding Solvency II technical provisions, though the CSM (averaging 8.6% of fulfilment cash flows) reverses this difference. Embedded value has been the standard valuation framework for European life insurers for decades (predating its widespread adoption in the US), with European Embedded Value (EEV) and Market Consistent Embedded Value (MCEV) representing the primary metrics analysts use to assess franchise value. Global life insurance premiums reached €2.9 trillion in 2024, with Western European life premiums growing 7.1% as higher interest rates revitalized annuity and savings product demand. For FIG bankers covering cross-border life insurance transactions, the differences between US GAAP/LDTI, IFRS 17, and statutory accounting (US SAP vs. Solvency II) create significant complexity in comparing target valuations across jurisdictions.

Life insurance sits at the intersection of risk transfer, investment management, and long-duration financial engineering, making it one of the most analytically demanding areas within FIG. The entry of PE-backed platforms has fundamentally altered the competitive landscape, creating new transaction types (block acquisitions, reinsurance sidecars, affiliated investment structures) that generate substantial advisory fees. For FIG professionals, the analytical toolkit required for life insurance (actuarial projection, ALM analysis, embedded value modeling, regulatory capital assessment) is broader than for any other FIG subsector, and the complexity creates barriers to entry that sustain premium advisory economics.