Definition
Term premium is the additional yield lenders require to hold a longer-maturity bond rather than rolling a series of short-maturity bonds over the same period, compensating for the interest rate risk and uncertainty embedded in the longer commitment.
Why it matters
The term premium is the structural reason the yield curve typically slopes upward — lenders demand more yield for the risk of tying up capital longer. When the premium is high, long-term bonds offer meaningful additional yield over rolling short-term bonds; when it compresses, the incremental yield disappears and the yield curve flattens or inverts. Understanding the premium is understanding why the term-structure has slope, and why that slope can change over the interest rate cycle.
How it works
Term premium is decomposed from the observed long-maturity yield: the yield on a 10-year bond can be split into two components — the average expected short-term interest rate over the next ten years, plus the additional compensation for accepting the risks of the 10-year commitment (the term premium itself). The premium reflects several risks: unexpected changes in short-term rates over the holding period, inflation surprises that erode real returns, and liquidity or supply-and-demand imbalances specific to longer maturities. For example, if the market expects short-term rates to average 3.5% over the next ten years and the observed 10-year yield is 4.2%, the implied term premium is roughly 70 basis points.
In practice
The term premium affects individuals through the pricing of long-duration commitments — mortgages, long-dated bonds, and lifetime income products that price against long yields. When the premium is elevated, extending a mortgage from 15 to 30 years costs more in incremental rate; when the premium is compressed, extending long-duration commitments becomes cheaper relative to short-duration alternatives. For an individual considering deferred lifetime income, the term premium is part of what the carrier is capturing on assets backing the deferral period — a wider premium generally supports higher deferred payout rates, other things equal. Most professionals discuss the term premium indirectly, through references to the shape of the curve or to whether long rates are attractive relative to short rates.
In the Longevity Standard Framework
Term premium is supporting vocabulary in the Longevity Standard framework, characterizing the internal structure of the discount rate environment within which cost of income is evaluated. Cost of income for lifetime income arrangements with longer effective durations — deferred income annuities, longer-horizon SPIAs, and pool structures with extended planning horizons — is disproportionately sensitive to the term premium, because the compensation embedded in long yields determines what the carrier or pool can afford to promise beyond the near term. When the term premium compresses, the incremental yield available on the long end of the general account portfolio falls, tightening insurer pricing capacity on long-duration income. The deferral multiplier's sensitivity to the rate environment is closely linked to the term premium — the premium is what a deferred arrangement is capturing from the term-structure beyond what an immediately commencing arrangement can access.
Related terms
- Yield curve
- Term structure of interest rates
- Duration
- Investment yield
- Deferral multiplier
- Real yield
- Nominal interest rate
- Yield curve inversion