What is an inverse floor and when would an investor use it?

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AcadiFi · Accepted Answer

An inverse floor (also called an inverse rate floor or reverse floor) pays the holder a notional amount times (Strike − Reference Rate) when the reference rate is above the strike, with payoff capped at some ceiling. It's effectively a capped cap — the holder benefits from modest rate increases but not extreme ones.

Typical structure: Payoff = min(max(0, L − K), Cap) × Notional × Accrual

Example: Strike K = 3%, reference = SOFR, Cap = 2%. If SOFR resets at 4%, payoff = min(max(0, 4% − 3%), 2%) = 1%. If SOFR resets at 6%, payoff = min(max(0, 6% − 3%), 2%) = 2% (capped).

Structural decomposition: Long inverse floor = Long cap(K) − Long cap(K + Cap). You buy protection above 3% and sell back protection above 5%.

Use cases:

1. Yield enhancement in structured notes: embedding inverse floors reduces hedging cost for the issuer, who passes part of the savings to the investor as higher coupons.

2. Views on range-bound rate environments: an investor expecting modest rate rises but not a spike gets better economics than a plain cap.

3. Asset-liability management: insurers with liabilities fixed in a narrow range can match hedges to the plausible rate distribution.

Risk: if rates spike well beyond the cap, the inverse floor underhedges — the holder receives less than a plain cap would provide.

What is an inverse floor and when would an investor use it?

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