UK implied inflation: 40 years
UK implied inflation: 40 years stood at 3.37% in Aug 2026, according to Bank of England — statistical and research datasets. It is one of the indicators in the Yield curves table (Value · Monthly), with a complete series running from Jan 2016 to Aug 2026. The complete series with an interactive chart, free to download.
This indicator in the Yield curves table
| Indicator | 08-2026 | 07-2026 | 06-2026 | 05-2026 | 04-2026 | 03-2026 | 02-2026 | 01-2026 | 12-2025 | 11-2025 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Implied inflation | |||||||||||
| 40 years | 3.37 | 3.33 | 3.27 | 3.32 | 3.42 | 3.46 | 3.31 | 3.34 | 3.17 | 3.12 | |
| 2.5 years | 3.95 | 3.85 | 3.62 | 4.12 | 4.64 | 4.76 | 3.37 | 3.49 | 3.03 | 3.17 |
Understanding UK implied inflation: 40 years
Positioned at the extreme forty-year horizon of the implied inflation surface in the United Kingdom, this series calculates the theoretical spread between nominal and real fitted sovereign yields at the longest available maturity. It captures generational inflation expectations, differentiating itself from all shorter maturity measures by absorbing the maximum theoretical duration risk and ultra-long hedging premia. The metric is derived by subtracting the forty-year real index-linked curve value from the forty-year nominal curve value.
Observers must interpret these figures with recognition of the limited trading depth and sparse issuance characterising debt instruments at this extremity. Monthly movements can exhibit heightened volatility driven by thin liquidity rather than fundamental shifts in long-term price outlooks. When evaluating this indicator alongside other maturity points, users should note that structural imbalances between ultra-long conventional and index-linked supply can produce unusual curve behaviour at the outermost edge.
Frequently asked questions
- What challenges arise when analysing this forty-year implied inflation series?
- Thin liquidity and sparse issuance at the ultra-long boundary can cause monthly volatility in the calculated spread.
- How does this metric differ from thirty-year implied inflation?
- It pushes the analytical horizon out by an additional decade, capturing the absolute limit of standard sovereign yield curve fitting.
- Does this spread reflect official government inflation targets?
- It reflects market-based pricing and risk compensation, which frequently diverge from central bank inflation targets.