Reserves and risk-based capital and how regulators test solvency

A life insurer is solvent when its assets, valued by the regulator's rules, are enough to cover what it owes, with a cushion on top. The amount it must set aside for what it owes is its reserves. The cushion is its capital and surplus. Regulators test both: they check that reserves are adequate, and they compare the cushion with a minimum that rises with the risk the company takes. When the cushion shrinks toward that minimum, the law hands the regulator stronger powers.

This post explains those pieces using a toy insurer with round, invented numbers. Real balance sheets are far more detailed, and real formulas have many more components, so the point is the logic, not the figures.

Why an insurer needs reserves at all

A life insurer collects premiums now and pays claims later, sometimes decades later. A 35-year-old who buys a level-premium permanent policy pays more than the cost of coverage in the early years, and that overpayment funds the higher cost of insurance in the later years. The money cannot simply be spent as profit. It has to be held, invested and available.

reserves are the accounting expression of that obligation. They are a liability on the insurer's balance sheet: the amount that, together with future premiums and investment earnings, is expected to be enough to pay the benefits already promised. For a whole life policy, reserves are tied to, but not the same as, the cash value. For a term policy, they are small, because the promise is simple. For an annuity, they track the account or guaranteed value.

An actuary calculates them using assumptions about how long people live, how many policies lapse, what the investments will earn and what expenses will be. The company's appointed actuary must certify, each year, that the reserves are adequate. Regulators and outside auditors review the work.

Why statutory reserves are deliberately cautious

Insurers keep two sets of books. Reports to the stock market follow general accounting rules. Reports to regulators follow statutory accounting, which is built for a different purpose: to show whether the company could pay its policyholders if things went poorly. Statutory accounting is conservative in several ways. It restricts which assets count at full value, it requires reserves based on prescribed or prudent assumptions, and it expenses certain costs of selling a policy right away instead of spreading them over time.

For many years the rules for most life reserves were formula-based, set by mortality tables and maximum interest rates. In recent years, states have moved much of the business to principle-based reserving and what it means for prices, in which reserves reflect the company's own experience and more realistic scenarios, within guardrails. The purpose of the shift was to bring requirements closer to the actual risk. The sourced guide on offshore reinsurance explains why reserve rules and capital rules were part of the reason insurers began moving some blocks to reinsurers in other jurisdictions; the questions policyholders ask about that are taken up in affiliated and offshore reinsurance, the questions policyholders ask.

A toy balance sheet

The following is hypothetical. Say Cardinal Life is an invented insurer with these figures, in millions of dollars, under statutory accounting:

The arithmetic: total assets of $1,000 million minus total liabilities of $900 million leaves $100 million of surplus. Surplus is the cushion. If asset values fall, or if reserves have to be increased, surplus absorbs the hit first. If it is used up, the company cannot meet its promises.

Surplus alone is not enough to judge safety, because $100 million is large for a small insurer and small for a huge one. That is the reason for risk-based capital.

Three things are worth noticing in the toy balance sheet before moving on.

First, reserves are by far the largest number. In this example they are 88% of assets ($880 million of $1,000 million). The adequacy of that single line matters more than almost anything else, which is why so much regulation is aimed at how reserves are calculated and who certifies them.

Second, surplus is thin in proportion to everything else. The $100 million cushion is 10% of assets. A loss of 10% of asset value would erase it entirely. The point of the investment rules, the capital formula and the examinations is to keep losses of that size from happening unnoticed.

Third, the assets are not all alike. Government bonds, corporate bonds, mortgages and stocks carry different risks and different charges in the capital formula. Two companies with identical balance-sheet totals can have very different risk profiles, which is why the total is not enough.

What risk-based capital adds

risk-based capital and life insurer solvency (RBC) compares the company's actual capital with a required minimum scaled to its risk. The formula, which the NAIC developed and states have adopted into law, assigns a charge to each part of the business: asset risk (the chance bonds, mortgages and stocks lose value), insurance risk (claims running worse than priced), interest rate and market risk, and business and affiliate risk. The charges are combined with a statistical adjustment so that the formula does not assume every risk goes wrong at once. The result is the Authorized Control Level (ACL), a dollar amount of required capital.

The ratio regulators watch is total adjusted capital divided by that required amount. State RBC laws set four action levels, as explained in the sourced guide on risk-based capital:

Say Cardinal Life's formula produces an ACL of $40 million. For simplicity, treat its total adjusted capital as equal to its $100 million of surplus. The ratio is $100 million divided by $40 million, or 250%, above every trigger.

Stress-testing the toy insurer

Now run some bad years. The numbers are invented.

Year one: corporate bonds lose value. Defaults and write-downs cost Cardinal $20 million of asset value. Assets fall from $1,000 million to $980 million. Liabilities stay at $900 million. Surplus drops to $80 million. Ratio: $80 million divided by $40 million equals 200%. That is the Company Action Level, and Cardinal must file a plan showing how it will restore capital.

Year two: another $20 million loss. Surplus falls to $60 million, a ratio of 150%. This is the Regulatory Action Level. The commissioner examines the company and can order corrective steps, such as limiting dividends to the owner, shifting investments, or requiring capital contributions.

Year three: another $20 million loss. Surplus is $40 million, a ratio of 100%. At the Authorized Control Level the commissioner may take control of the company, which usually means asking a court for insurer rehabilitation.

The limit. At $28 million of surplus, the ratio is 70%, and the commissioner must act.

In practice the ACL itself changes as the company's assets and business change, and companies act long before the third year. They raise capital, sell the business, cut risk or reinsure. Real failures unfold over months or years, as the sourced guides on failures describe, and regulators often intervene while a company is still above 100%.

A reserve shock instead of an asset shock. Say instead that a pandemic-like surge in claims convinces Cardinal's actuary that reserves must rise by $30 million. Liabilities go from $900 million to $930 million. Assets are still $1,000 million, so surplus is $70 million and the ratio is $70 million divided by $40 million, or 175%. That is below 200% and triggers a plan, even though no investment lost a dollar. Reserves and capital are connected: anything that increases the amount owed reduces the cushion.

Matching assets to liabilities

The reason a company can have a good balance sheet today and a bad one later is the mismatch between what it holds and what it owes. Reserves and assets are both estimates over many years, and they respond differently to changes in interest rates.

A simple invented example shows the idea. Say a policy promises to pay $1,000 in ten years, with the company crediting a 3% guaranteed rate. The amount needed today is about $744, because $744 growing at 3% a year for ten years is about $1,000. The company invests that $744 in a bond maturing in five years that pays 4% a year. After five years the bond is worth about $905. Now the company must reinvest the $905 for the remaining five years, and what it earns then decides the result:

When rates fall to 1%, the insurer is short. When they rise, it gains. This is reinvestment risk, and it is one reason the actuary's annual analysis tests whether the assets would be enough under several interest rate scenarios. A company that matches the timing of its assets to its liabilities, for instance by buying a ten-year bond for the ten-year promise, takes much less of this risk. A company that does not match, perhaps to earn a higher yield, takes more, and the capital formula charges more for it.

The risk is greatest for products with long guarantees, such as permanent policies with guaranteed rates and annuities, which is why interest rate risk is a named part of the RBC formula. A company can also be exposed in the other direction: if rates rise sharply, policyholders may surrender and take their money elsewhere, forcing the insurer to sell bonds that have fallen in value.

Asset adequacy testing

Besides the formula, regulators require asset adequacy analysis each year. The appointed actuary projects the company's assets and liabilities under many scenarios, such as rising rates, falling rates, a recession and a spike in lapses, and tests whether the assets would still be enough. If they would not, the company has to hold extra reserves. The test is meant to catch the slow-moving risks that a ratio calculated at year-end may not show. This is the reason the department's analyst in the example of the supervisory year in how a state insurance department supervises a life insurer year to year asks for the asset adequacy presentation when a company's margins narrow.

How regulators use the numbers in practice

A ratio is a trigger, not a verdict, and regulators do not wait for it to cross a line. Analysts read the trend. A company whose ratio has fallen from 400% to 300% over three years, while its portfolio has shifted toward harder-to-value assets, may get more questions than a company that has held steady at 250%. They also compare each company with similar ones, and read the notes to the financial statements for items such as affiliated transactions and reinsurance.

The thresholds matter most because they remove argument. Once a company is below a level, the law says what happens next, so the regulator does not have to prove in court that a company is in trouble before asking for a corrective plan. The step from "must file a plan" to "may take control" is deliberately gradual, giving a company that is still fundamentally sound room to repair itself, and giving the commissioner a legal basis to act if it does not.

Critics make two reasonable points. The formula depends on how charges are set for each type of asset, and newer or more complex assets can take time to be charged appropriately. And a formula, however careful, cannot replace judgment about management and governance. Supporters respond that the formula is revisited regularly, that it works alongside examinations and asset adequacy testing, and that the alternative, a flat dollar minimum, was much less sensitive to risk. Both points can be true at once.

What the ratios can and cannot tell you

A high RBC ratio is reassuring. It is not a ranking, and the NAIC has said that RBC is not intended or appropriate as a means to rank insurers generally. The ratio is also:

• Self-reported in annual filings, based on statutory accounting.
• Backward-looking: it reflects year-end data, filed months later.
• Dependent on the formula's assumptions. Regulators have revisited the charges for newer assets and for certain reinsurance arrangements.
• A minimum standard. A company at 400% and one at 450% are not meaningfully different on that basis.

Independent ratings from agencies such as AM Best weigh capital together with earnings, investments and management, and the AM Best, S&P, Moody's and Fitch ratings explained guide explains how to read them. None of these measures is a guarantee. The state guaranty system sits behind them as a backstop, and its limits are discussed in the other posts on insurer safety, including a worksheet to add up your coverage per insurer against guaranty limits.

What it means for you

You do not need to calculate an RBC ratio. What the logic gives you is a set of sensible questions:

1. Is the company's financial strength rating strong, and what is the date?
2. Does the product I am buying carry a long guarantee? The longer and more generous the guarantee, the more the company's capital matters.
3. Is the company reinsuring the business? Reinsurance is normal, and your contract remains with the original insurer, but the arrangements affect capital, as the questions in affiliated and offshore reinsurance, the questions policyholders ask discuss.
4. Do I understand which parts of my policy are guaranteed and which depend on the company's results?
5. Is any part of what I hold above my state's guaranty limits?

For answers about a specific company, read its rating reports and look at its state insurance department's pages. For personal decisions on large holdings, a fee-only planner can help.

Key takeaways

• Reserves are what an insurer must hold to pay promised benefits; surplus is the cushion left over after liabilities, and both are measured under conservative statutory accounting.
• Risk-based capital compares actual capital with a required minimum scaled to the company's risk, and the thresholds of 200%, 150%, 100% and 70% of the Authorized Control Level give regulators defined powers.
• In the toy insurer, a $20 million loss moved the ratio from 250% to 200%, and a reserve increase of $30 million moved it to 175% without any asset loss.
• Mismatches between the timing of assets and liabilities create interest rate risk, which is why regulators require scenario testing as well as a ratio.
• RBC ratios are a floor for supervision, not a ranking, so use them alongside independent ratings and your state's guaranty limits.