A Structured Note vs. Its PartsMedium

Almost every structured product is a bond plus one or two options. Pricing the parts separately is the only way to see what the wrapper costs.

4 min read · 640 words

The decomposition

• Take a note that returns your money at maturity plus a share of an index's rise. It is two things: a zero-coupon bond maturing at 100, and a call option on the index.
• The bond costs less than 100 today, and the difference is what pays for the option. That is the entire construction.
• Every payoff in the structured shelf decomposes this way. A reverse convertible is a deposit plus a sold put — which is why it pays a high coupon and why it can return shares instead of cash.

A worked example

Rates are 4% and the note runs five years.

• A zero-coupon bond paying 100 in five years costs 100 ÷ 1.04⁵ = about 82.2.
• That leaves about 17.8 out of every 100 invested to buy the option.
• If a five-year call on the index costs 20 for full participation, 17.8 buys about 89% of it — which is where a "participation rate" of 89% in the term sheet comes from.

Nothing is hidden in this arithmetic, and it is why participation rates fell when rates were near zero: the bond leg cost almost 100 and there was nothing left for the option.

What the wrapper genuinely adds

• Access. Buying a five-year index option is not available to most people. The note is.
• One line, one settlement. No margin, no rolling, no expiry to manage.
• A defined outcome. The payoff is written down and does not depend on execution.

What it removes

• Visibility of the price. The parts have observable prices; the note has an issuer's quote.
• The dividends. A note on a price index does not pass on dividends. Over five years that is a substantial part of an equity return, and it is one of the main sources of the option budget.
• The ability to change your mind cheaply. Selling before maturity means dealing with the issuer at its price, which includes a spread and the remaining structuring margin.
• Independence from the issuer. This is the big one: both legs become claims on one bank. See if the other side fails.

Four differences that survive the decomposition

• The margin is inside. The issuer's fee is the gap between 100 and what the parts are worth. It is not a line item, and the term sheet may or may not state an estimated value — where regulation requires one, it is the number to look for.
• Counterparty risk applies to the whole amount. Holding a bill and an option separately means two exposures, one of them to a government. Holding the note means one exposure, to a bank, for everything.
• Tax and reporting treatment differ by jurisdiction and by wrapper, in ways this site does not cover because they depend on the reader.
• Barriers change the shape entirely. A note with a barrier is not a bond plus a plain option — it is a bond plus a path-dependent option, and its value can move sharply as the price approaches the barrier. That is a real difference in the parts, not in the packaging.

How to use the decomposition

• Work out the bond leg from the term and prevailing rates. That tells you the option budget.
• Ask whether the payoff being offered plausibly costs about that budget. If the offer looks generous relative to it, something else is being sold — usually optionality by you, to the issuer.
• Check what happens to dividends, because their absence is often the quiet source of the funding.
• Then read the term sheet for the clauses the arithmetic cannot see: early redemption, the barrier's observation dates, and what the issuer may do.

None of this says a note is worse than its parts. It says the parts are where the price comes from, and that a payoff nobody can price is a payoff nobody can compare.