What it means
Any long bond yield can be thought of as two things added together: what the market expects average short-term interest rates to be over the bond's life, plus a premium for the risk of being locked in. If investors were perfectly indifferent to maturity, the 10-year yield would be nothing more than the average expected overnight rate and the term premium would be zero.
The premium matters because it moves independently of central bank policy. A long bond yield can rise sharply even when nobody expects higher short rates, purely because investors are demanding more compensation for uncertainty, for heavy government issuance or for the fear that inflation surprises on the upside.
For any business, that shows up as a higher cost of long-term borrowing without any change in the policy rate. In practice the term premium is estimated using models that compare observed yields with survey-based or market-implied expectations of future short rates.
Different models produce different numbers, and estimates are frequently revised, so treat any single published figure as an approximation rather than a measured fact. What analysts watch is the direction and the size of the move, not the second decimal place.
The term premium can be negative as well as positive. When investors are frightened, or when large price-insensitive buyers such as pension funds and central banks are hoovering up long bonds, the scarcity of safe long-dated paper can push the premium below zero and produce a long yield lower than expected short rates.
For a finance team this is not academic. The term premium sits inside the discount rate used to value long-lived assets, so a rise of half a percentage point can knock several per cent off a valuation, raise a company's cost of debt on new long-dated issuance and make short-term funding look temporarily cheap.
That last point is a trap, because short funding has to be refinanced at whatever rates exist later.
In practice
Real-world examples.
Example
A corporate treasurer is deciding between issuing five-year and thirty-year bonds. The thirty-year yield is 1.6 percentage points above the five-year, and after discussion with the bank the team concludes most of that gap is term premium rather than expected rate rises, so they issue at five years and accept refinancing risk.
Example
A pension scheme actuary explains to trustees that the scheme's deficit widened even though the central bank did not move rates. The cause was a rise in the term premium on long government bonds, which lifted long yields, cut bond prices and reshaped the discount rate applied to liabilities.
Example
An infrastructure fund modelling a 25-year toll road adds a term premium assumption of 1% on top of expected policy rates when setting its long-run discount rate. The adjustment reduces the project's present value by enough to push the internal rate of return below the fund's hurdle, and the bid is dropped.
Think of it
“Term premium is extra return for holding longer bonds-compensation for duration risk.
Formula
Calculation
Term premium = long-term bond yield - average expected short-term rate over the same horizon
Suppose the 10-year government bond yields 4.30%, while market pricing and surveys imply that the average short-term policy rate over the next ten years will be 3.50%. The term premium is 4.30% - 3.50% = 0.80 percentage points, usually quoted as 80 basis points.
For an investor holding $10,000,000 of that bond, the term premium is worth 0.80% x $10,000,000 = $80,000 a year of extra yield, purely as compensation for maturity risk. Now suppose expectations of short rates stay at 3.50% but the term premium widens to 1.30%. The 10-year yield becomes 3.50% + 1.30% = 4.80%, a rise of 0.50 percentage points. On a bond with a duration of about 8, the price falls by roughly 0.50% x 8 = 4%, wiping about $400,000 off the value of that $10,000,000 position.Case study
Seen in the real world.
Corvina Wind Partners is a fictional, illustrative renewable energy developer that finances 25-year wind farms with long-dated project bonds. In its base case the team assumed long yields would track expected policy rates, and priced a $180,000,000 issue on that basis.
Over the following six months the central bank held rates flat, yet the yield on comparable 20-year paper rose by 0.70 percentage points as investors demanded more compensation for holding long duration. Corvina's pricing assumption broke, and the same issue would now cost roughly $1,260,000 more in annual interest before any hedging. The team had modelled policy expectations carefully and had ignored the term premium entirely.
The illustrative fix was to split the funding: a smaller long-dated tranche issued immediately, and a shorter bridge facility refinanced once the premium narrowed. It cost more in fees but removed the risk of locking a 25-year asset into a single bad pricing day.
Watch out
Common mistakes.
- Treating the whole gap between long and short yields as a forecast of future rate rises, when a large part of it can simply be compensation for maturity risk.
- Quoting a single published term premium estimate as a fact, when different models produce materially different numbers for the same day.
- Assuming the term premium can never be negative, when strong demand for safe long bonds has repeatedly pushed it below zero.
Questions
People also ask.
Is the term premium the same as the yield curve slope?
No, the slope is the raw difference between long and short yields, while the term premium is only the part of that slope not explained by expected future short rates.
Why should a non-financial business care about it?
Because it feeds directly into the cost of long-dated debt and into the discount rate used to value long-lived projects, so it changes investment decisions even when the policy rate is unchanged.
Can a company hedge against a rising term premium?
Not directly, but it can manage the exposure by shortening the maturity of new issuance, using interest rate swaps, or pre-funding when long-term pricing looks attractive.
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