Definition in one sentence
The option budget is the amount of money an insurer can use in a crediting period to buy options that hedge the index interest. The IUL account does not buy shares: the insurer invests premiums in its general account, mainly in fixed-income assets such as bonds, then takes part of the interest earned to buy options, and the proceeds of the options at expiry fund the index interest.
The Society of Actuaries (SOA) describes the same mechanism in a research report using indexed annuities as the example: income from fixed-income investments is used to buy options linked to an external index, specifically a call spread made up of a purchased and a sold call option; the report also notes that some insurers use futures for dynamic hedging instead (SOA, Aug 2022). IUL works on a similar mechanism to indexed annuities, but the specific hedging programme varies by company. This site does not address any company's actual budget or hedging cost, and all figures below are hypothetical illustrations.
Where the budget comes from: from general account yield to option budget
The SOA describes the calculation as starting from the general account yield and deducting, in turn, a credit default provision, expenses (including commissions, acquisition and maintenance costs) and a profit target. What remains is the option budget.
| Item | Illustrative figure (per year, as a share of index account value) | Note |
|---|---|---|
| General account yield | 5.5% | Yield on bonds and similar assets |
| Less: default cost | 0.5% | Provision for expected losses on credit holdings |
| Less: expenses | 0.5% | Acquisition, commission, maintenance and so on |
| Less: profit target | 0.5% | The insurer's internal pricing target |
| Option budget | 4.0% | The part available to buy options |
What is spent is "interest"; the principal remains in the bonds. This is one structural explanation of why an index account can carry a 0% floor. However, both the floor and the index interest are contractual obligations of the insurer and depend on its solvency; the SEC's indexed annuity material likewise warns that amounts payable under the contract depend on the insurer's ability to pay (Apr 2011).
How options replicate a payoff shape
| Payoff shape | Corresponding option combination | What determines the parameter |
|---|---|---|
| 0% floor + 10% cap + 100% participation rate | Buy an at-the-money call and sell a call struck 10% higher (a call spread) | The bigger the budget, the higher the cap that can be set |
| No cap + participation rate p | Buy p units of at-the-money calls | Participation rate = budget ÷ price of an at-the-money call |
| Spread s | Buy an out-of-the-money call struck s higher | The larger the spread, the cheaper the option |
| Floor f above 0% | Set aside budget f as the certain floor and use the rest to buy a call struck f higher | The higher the floor, the less budget is left for the upside |
| Buffer | Sell an additional out-of-the-money put to add budget (SOA's description for annuity-type products) | The holder bears the downside beyond the buffer, in exchange for more budget and a higher cap |
The same budget in a different shape
Continuing with the 4.0% hypothetical budget in the table above, assume that a one-year at-the-money call costs 7.5% of principal and that selling a call 10% out of the money recovers 3.5%.
| Design | Option combination | Assumed cost | Resulting parameters |
|---|---|---|---|
| Price index, capped | At-the-money call − 10% out-of-the-money call | 7.5% − 3.5% = 4.0% | 10% cap, 100% participation rate |
| Price index, participation-rate type | Buy at-the-money calls only | 7.5% per 100% participation | Participation rate of about 53%, no cap |
| Low-volatility index, participation-rate type | Buy at-the-money calls only | Assumed 3.5% per 100% participation | Participation rate of about 114%, no cap |
The third row shows why a participation rate can exceed 100%: the underlying index is less volatile, so options are cheaper and the same budget buys more units. This does not mean a higher return than the index, because a low-volatility index has a narrower distribution of gains to begin with (see Index options).
How four market variables move the parameters
| Variable | Change | Effect on budget or option price | Direction for cap or participation rate | Basis |
|---|---|---|---|---|
| Bond yield | Rises | Budget expands | A higher cap and crediting rate can be offered | SOA (Aug 2022) |
| Expected volatility | Rises | Options become dearer | Cap or participation rate falls | The SOA notes that option cost varies with expected volatility, interest rates and dividend yield |
| Dividend yield | Rises | Calls on a price index become cheaper | Favours a higher cap | General rule of option pricing (analysis) |
| Default cost, expenses, profit target | Rise | Budget shrinks | Cap or participation rate falls | Budget deductions listed by the SOA |
A price index excludes dividends, which means the holder gives up that part of the return; under the general rules of option pricing this also makes the corresponding calls cheaper. This is one reason index interest is not the same as total return.
Why parameters differ by company for the same index
Linked to the same S&P 500, different insurers often have different caps. This does not mean that one is more generous or more conservative. The usual reasons fall into the following groups.
| Factor | Explanation | Basis |
|---|---|---|
| General account yield | Differences in credit quality, duration and current yield of the asset portfolio give different starting points for the option budget | SOA (Aug 2022) |
| Expenses and profit target | Different acquisition and maintenance costs and profit targets mean different budget deductions | SOA (Aug 2022) |
| Hedging method | Buying options, dynamic hedging with futures or cross-hedging against other liabilities give different costs and residual risks | SOA (Aug 2022) |
| Product commitments | A higher floor, loyalty crediting rate, bonuses and guaranteed minimum caps use up different amounts of budget | Analysis; the product summary prevails |
When comparing parameters across companies, therefore, do not compare cap or participation rate values alone; compare floors, guaranteed minimums, additional crediting rates and charging structures at the same time. See IUL cost of insurance and charges.
Parameter resets: frequency, disclosure and the regulatory view
The SEC material notes that index-linked contracts generally allow the insurer to reset the participation rate, cap and spread periodically (for example annually) (Apr 2011). For index-linked annuities, the SOA explains that insurers typically announce new caps and other parameters once or twice a month, applying to contracts issued afterwards (Aug 2022). For IUL, Great Eastern's quarterly statement lists the cap rate and crediting rate by segment (17 Aug 2026), which shows that parameters are recorded segment by segment. Which parameters take effect on segments in progress, when they are reset and how holders are told should be checked in the product summary.
The U.S. NAIC's AG 49-A defines this "budget" explicitly. It applies to policies sold in the United States and not to Singapore products, but it helps explain the logic that constrains parameters (NAIC, 11 Dec 2025).
| AG 49-A concept | Plain-language explanation |
|---|---|
| Hedge Budget | The annualised amount an index account uses to generate index interest, as a percentage of that account's value, which must be consistent with the company's hedging programme |
| Net investment earnings rate | The annualised yield on general account assets (excluding hedging assets) net of investment expenses and default costs; it may not be raised by using policy charges |
| Illustration cap for the benchmark account | No more than the lower of the 25-year look-back average and 145% of the net investment earnings rate |
| Supplemental hedge budget | The part of an account's hedge budget that exceeds what the benchmark account can use; it must be deducted first in the illustration test before comparison |
What this means for readers, and a checklist
Parameters change because the budget and option prices change, not because a contract is rewritten unilaterally, but readers should still note that the same index carries different parameters at different insurers, partly because of differences in general account yield, expenses and profit target, and hedging method. Prudential also states in its public release that cap rates and participation rates may change (20 Jul 2026).
- Whether the product summary lists the guaranteed minimum cap rate and minimum participation rate.
- How often parameters are reset and whether a reset applies to segments in progress.
- How resets are notified and whether the annual statement lists the parameters of each segment.
- Whether a higher participation rate or bonus on one account is supported by additional charges.
- Whether the benefit illustration uses current or guaranteed parameters; see How to read a benefit illustration.
If you would like a product summary or benefit illustration interpreted in light of your own circumstances, you can register your needs through the contact details on this site.
Sources and dates
- Registered Index-Linked Annuities — Society of Actuaries Research Institute · 2022-08
- Actuarial Guideline XLIX-A (revised, posted) — NAIC · 2025-12-11
- Investor Bulletin: Indexed Annuities — U.S. SEC Office of Investor Education and Advocacy · 2011-04
- Prestige Legacy Index (product page) — Great Eastern · 2026-08-17
- Prudential launches indexed universal life plan to meet demand for flexible legacy planning solutions — Prudential Singapore · 2026-07-20