By Mike Duncan | December 2025
Why Familiar Structures Fail and What Endures Across Regimes
Most long-dated rates hedges fail even when rates behave exactly as expected. The problem is not forecasting. It is structure.
Between 2020 and 2023, many institutional investors learned this directly. Receive-fixed swaps locked in historically low rates, exactly as intended. Duration was neutralised. Reports looked clean. Then, floating legs reset higher, cash outflows turned persistent, and liquidity stress replaced interest-rate risk as the dominant problem. Nothing unexpected happened. The hedges did what they were designed to do. What failed was the assumption that locking a rate was the same thing as locking the economics.
What this paper argues
There is one distinction that determines whether a long-dated rates hedge behaves or fails: whether it closes economics at inception or defers them into future regimes. Instruments that defer economics accumulate exposure to funding conditions, liquidity availability, and repeated decision-making under stress. Instruments that close economics concentrate risk early but remove the need for future intervention.
Rolling structures and tenor matching are not flawed in themselves. They become dangerous when applied to exposures that are not contractually durable, or when flexibility is assumed rather than real. Collateral and liquidity are not operational afterthoughts – they are the primary mechanism through which long-dated hedges fail in practice. When hedges break, it is rarely because rates moved too far. It is because the hedge could not be funded through the move.
What it covers
- Why long-dated rates hedges fail even when rates behave broadly as expected – and the design choice that makes failure predictable
- The single distinction that matters: closing economics versus deferring them
- Why familiar instruments dominate and what that costs over long horizons
- Tenor matching: when it removes uncertainty and when it introduces termination risk
- Rolling structures: why they are a tactical tool and a structural liability for long-dated exposure
- How pro-cyclical margin becomes the failure mechanism under regime stress
- The cheap hedge fallacy: why lifecycle liquidity is the largest cost component most institutions never measure
- Three worked examples across private credit, infrastructure, and family office balance sheets
- A structural diagnostic: five questions that surface hidden assumptions in any long-dated hedging programme
- Six governing principles for hedges that survive regime change, governance turnover, and liquidity stress
The central argument
Uncertainty can be resolved at inception or left for the future. It cannot be eliminated by clean reports, familiar instruments, or sensitivity metrics. Long-dated rates hedging is not a technical exercise. It is a commitment decision.
Read the practitioner paper
Designing Long-Dated Rates Hedges That Work – Why Familiar Structures Fail and What Endures Across Regimes
