How do autocallable structured products work, and what drives the coupon level relative to barrier placement?

Autocallable structured notes are among the most popular retail structured products globally, generating tens of billions in annual issuance. They offer above-market coupons in exchange for the investor bearing conditional downside equity risk through an embedded knock-in put.\n\nCore Mechanics:\n\nAn autocallable has three critical levels defined at inception relative to the initial fixing price of the underlying (typically a stock, index, or worst-of basket):\n\n`mermaid\ngraph TD\n A[\"Autocall Barrier
e.g., 100% of initial\"] -->|\"If underlying >= barrier
on observation date\"| B[\"Note is called early
Return principal + coupon\"]\n A -->|\"If underlying < barrier\"| C[\"Note survives
to next observation\"]\n C --> D{\"At Maturity\"}\n D -->|\"Underlying >= knock-in barrier\"| E[\"Return 100% principal
+ final coupon\"]\n D -->|\"Underlying < knock-in barrier
at any point during life\"| F[\"Knock-in put activated
Investor suffers equity loss\"]\n F --> G[\"Redemption = Notional x
(Final / Initial)\"]\n`\n\nWorked Example:\n\nBriarcliff Capital structures a 2-year autocallable on the Meridian Large Cap Index (initial level = 4,200):\n\n| Parameter | Value |\n|---|---|\n| Autocall barrier | 100% (4,200) |\n| Coupon barrier | 75% (3,150) |\n| Knock-in put barrier | 65% (2,730) |\n| Coupon | 9.50% p.a., paid quarterly if index >= coupon barrier |\n| Observation frequency | Quarterly, starting month 3 |\n| Memory coupon | Yes -- missed coupons paid if barrier recrossed |\n\nScenario Analysis (per $100,000 notional):\n\nScenario 1 -- Called at month 6: Index at 4,350 (103.6%). Investor receives $100,000 + $4,750 (two quarters at 2.375%) = $104,750.\n\nScenario 2 -- Survives to maturity, no knock-in: Index finishes at 3,400 (81%). Above knock-in barrier. Investor receives $100,000 + accrued coupons for quarters where index exceeded 3,150.\n\nScenario 3 -- Knock-in triggered, index at 2,520 at maturity (60%): Investor receives $100,000 x (2,520 / 4,200) = $60,000, a 40% loss.\n\nWhy Coupons Are High:\n\nThe issuer effectively buys a knock-in put from the investor. The premium from selling this put, combined with the issuer's funding advantage over risk-free rates, finances the enhanced coupon. The deeper the knock-in barrier (more out-of-the-money), the cheaper the put and the lower the coupon the issuer can offer. Typical relationships: a 60% barrier might support a 7% coupon, while a 70% barrier could fund 11%.\n\nKey Risk Factors for Pricing:\n- Implied volatility of the underlying (higher vol = more expensive put = higher coupon)\n- Dividend yield (higher dividends reduce forward price, increasing knock-in probability)\n- Correlation in worst-of baskets (lower correlation = higher coupon but dramatically more risk)\n- Credit spread of the issuer (the note is an unsecured obligation)\n\nExplore structured product risk decomposition in our FRM course materials.