Index-Linked Certificate of Deposit

An index-linked certificate of deposit, often called an index-linked CD or market-linked CD, is a deposit obligation issued by a bank that allows the depositor to participate in the potential appreciation of a specified market index, such as a stock market index, over the term of the CD, rather than earning a conventional fixed interest rate. Like an ordinary certificate of deposit, the principal is generally protected and the deposit is typically eligible for standard deposit insurance up to applicable limits, but the return earned depends on how the referenced index performs over the deposit's term rather than being fixed in advance.

Index-linked CDs are sold through bank branches and both affiliated and unaffiliated brokers, and are structured as deposit obligations of the issuing bank, meaning they are not securities registered under securities laws in the way a mutual fund or exchange-traded fund would be, even though their payout structure resembles an investment product more than a traditional savings account.

A conventional CD promises a fixed interest rate known in advance; an index-linked CD instead promises to track, to some degree, the performance of a chosen market index, offering the possibility of a higher return if the index rises, in exchange for giving up the certainty of a fixed rate from the outset. Depositors generally still keep their original principal protected, since most index-linked CDs guarantee at least the return of the amount deposited even if the index performs poorly or falls over the term.

• A participation rate determines what percentage of the index's gain the depositor actually receives, which is often less than 100 percent of the index's full upside.
• A cap may limit the maximum return the CD can pay, regardless of how much the underlying index actually rises.
• Principal protection generally guarantees the return of the original deposit at maturity even if the index declines, though this protection typically does not apply if the CD is cashed in before its stated maturity date.

Because the return depends on index performance, an index-linked CD can end up paying very little, sometimes nothing beyond the return of principal, if the referenced index performs poorly over the term, which distinguishes it meaningfully from a conventional CD that guarantees a known interest rate regardless of market conditions. The complex payout structures of some index-linked CDs, involving participation rates, caps, and specific averaging or crediting methods, make it important for investors to carefully review the relevant offering documents and disclosure statements before purchasing, since two index-linked CDs tied to the same index can produce very different actual returns depending on their specific structure.

Index-linked CDs are generally less liquid than ordinary savings products, often imposing an early withdrawal penalty or even the loss of principal protection if cashed in before maturity, which is why these products are typically marketed toward depositors who can commit to holding the deposit for its full term rather than those who may need access to the funds on short notice.

An investor seeking exposure to a market index's upside has an alternative to an index-linked CD: investing directly in a low-cost index fund or exchange-traded fund that tracks the same index. Direct index investing generally offers full exposure to the index's performance without a participation rate or cap limiting the upside, but comes without the principal protection and deposit insurance that an index-linked CD provides, meaning the choice between the two ultimately reflects a tradeoff between full market exposure and principal safety, rather than one option being straightforwardly better than the other.

Index-linked CDs tend to appeal to conservative savers who want some exposure to potential market gains but are unwilling to risk their principal in a market downturn, often as a complement to, rather than a replacement for, more conventional savings and investment holdings within a broader financial plan.

Regulators have at times flagged index-linked CDs for closer scrutiny of how clearly their complex payout terms are disclosed to ordinary retail savers, who may not fully appreciate how a participation rate or cap can quietly limit the very upside the product is marketed around.

Reading the specific index, participation rate, and cap stated in an index-linked CD's offering documents, rather than relying on marketing language alone, is the only reliable way to understand what return the product can realistically deliver.

A saver comparing one of these products against an ordinary savings account should weigh the capped upside carefully against the guaranteed, if lower, return the simpler account would provide instead.

• Federal Deposit Insurance Corporation