Understand how an IUL policy credits interest, charges fees and lapses before you read an illustration

Definition: what IUL is and what "indexed" changes

Indexed universal life (IUL) is a type of universal life (UL) insurance: a long-term life policy with a death benefit and an account value that earns interest and pays for the cost of cover. The word "indexed" changes only the source of interest. Instead of a rate declared by the insurer, the index account is credited by a formula in the contract that references how an index, commonly the S&P 500, moved over a crediting period, subject to a floor, a cap and a participation rate. The policy owner holds no shares or fund units and receives no dividends.

MoneySense, the national financial education programme associated with MAS, describes universal life policies as bundled products combining insurance protection with an investment return, with a crediting rate that cannot fall below a contractual minimum which can be 0% (updated 28 September 2026). In Singapore, IUL plans describe themselves as non-participating universal life plans, for example in Singlife's announcement of 26 February 2026; they are not investment-linked policies (ILPs).

How the money flows: three layers and the first year

An IUL can be read in three layers. Each answers a different question.

In the first year the sequence is usually as follows; the product summary prevails where terms differ.

1. The premium is paid and a premium charge is deducted, leaving the net premium.
2. The net premium is split between the fixed account and the index accounts. The index portion may wait in a holding account until the next segment starts.
3. A lock-in date, usually some working days before the segment starts, fixes the starting index level.
4. The policy fee and cost of insurance are deducted from the account value, commonly each month, while index interest is credited once when the segment ends, commonly after one year.
5. The surrender value is the account value less any surrender charge and loan, and in early years it is usually below the premiums paid.

How index interest is credited

A segment is a block of money in the index account with its own start date, end date and parameters. Under point-to-point crediting, only the index level at the start and at the end of the segment matters. The SEC's investor bulletin on indexed annuities describes the method as comparing index levels at two points in time and notes that gains are generally computed without dividends; Singlife's product page (as at 5 September 2024) likewise states that index interest excludes dividends.

Four parameters then shape the result.

A hypothetical example, not a quotation: with a 100% participation rate, a 10% cap and a 0% floor, an index gain of 12% credits 10%, a gain of 6% credits 6%, and a fall of 5% credits 0%. With a 120% participation rate and no cap, a 5% gain credits 6%, not 25%. Prudential's press release of 20 July 2026 states that cap and participation rates are subject to change.

The interest is not earned on shares held in the account. The Society of Actuaries explains that insurers use bond income to buy options on the index. The option budget is the general account earned rate less default cost, expenses and profit margin, and higher bond yields allow higher caps (the report covers index annuities; IUL works similarly). This is why parameters move over time and differ between insurers.

Charges, and why a zero-interest year still costs money

IUL charges fall into four groups. Rates are set in the product summary and policy contract, so none are quoted here.

The net amount at risk is the death benefit less the account value. MoneySense notes that the recurring fee for insurance cover usually increases with age. Charges are taken month by month while index interest is credited once at the end of a segment, so a 0% floor does not stop the account value from falling in a year with no index interest. The floor protects the index interest, not the account value after charges.

What is guaranteed and what is not

Key risks

1. Zero-credit years still carry charges, so the account value can decline. Currency risk also arises when the policy currency differs from the owner's spending currency.
2. Caps and participation rates can be lowered, so the current-scenario illustration can overstate results.
3. Current charges can rise up to the contractual maximum.
4. The policy lapses if the account value cannot pay the charges and no premium is added (MoneySense).
5. Early surrender usually returns less than the premiums paid.
6. A policy loan accrues interest and reduces the death benefit. MoneySense advises considering a universal life policy only if premiums can be paid without borrowing.
7. Insurer ratings and systemically important status do not mean that the government or a regulator guarantees a policy.

Rules in Singapore and the United States

Singapore. LIA's guidelines require non-participating universal life illustrations to show two scenarios: the guaranteed crediting rate with maximum charges, and the current rate with current charges. The higher scenario must not exceed what the asset portfolio can support, and non-guaranteed charges must not be lower than prevailing charges (LIA MU 22/24 of 7 June 2024, which superseded the 2018 edition; the clauses cited are unchanged from 2018). The Policy Owners' Protection Scheme covers guaranteed benefits only, capped at S$500,000 of guaranteed sum assured and S$100,000 of guaranteed surrender value per life assured per insurer (SDIC, accessed 22 October 2026); it is not a government guarantee of the policy. Life insurers allow a 14-day free-look period from receipt of the policy documents (LIA, May 2020).

United States. Actuarial Guideline XLIX-A (AG 49-A) governs illustrations for index-linked policies sold in the United States from 14 December 2020. It limits the illustrated rate, limits interest credited on borrowed amounts to 50 basis points above the loan rate, requires an alternate scale alongside, and from 1 April 2026 bars historical tables for indexes with under ten years of history. It does not govern Singapore policies, but much IUL terminology originates there.

Who may find IUL relevant, and next steps

IUL is discussed by people who want lifelong cover and a long-term account in one contract, who accept that the floor comes with a cap, and who can keep paying charges without borrowing. It is generally not suited to money needed within a few years, to anyone who needs every benefit guaranteed, or to anyone who cannot cope with top-up premiums or rising charges.

Before reading any illustration, ask for the product summary and an illustration prepared on the same assumptions for every product compared. For side-by-side product parameters, see the iul.sg comparison; the Chinese pages of this site (crediting, caps and floors, charges, policy loans, lapse) cover each mechanism in depth, and the FAQ answers common questions. This page is general information, not advice, and readers who want an illustration interpreted for their own situation can register an enquiry through the contact details on this site.