Long-Dated Gilts: Higher Yields, Higher Risk

Lend money to the UK government for twenty or thirty years and you expect to be paid a bit more for the wait. That extra reward shows up in long dated gilts, the bonds that mature well into the future. Right now they offer some of the highest yields on the gilt market. They also carry the sharpest price swings.

This article looks at gilts maturing 15 years or more from today. We cover why their yields sit above shorter bonds, what duration risk really means, and the kind of investor they suit.

What counts as a long dated gilt

There is no official rulebook, but most people treat anything maturing 15 years or more out as long dated. The gilt market stretches a long way. At the far end sits the UK Treasury 1.625% 2071, which does not repay until roughly 45 years from now.

A few examples from the current data show the range:

• UK Treasury 4.5% 2042, about 16 years out, priced at 89.83 with a yield to maturity of 5.46%
• UK Treasury 4.25% 2049, about 23 years out, priced at 82.97 with a yield to maturity of 5.57%
• UK Treasury 4.375% 2054, about 28 years out, priced at 82.64 with a yield to maturity of 5.62%

Yield to maturity is the total annual return you would earn if you bought at today's price and held to the end, counting both the interest and any gain or loss as the price pulls back to 100 at repayment.

Why they pay more

Compare the long end with the short end and the pattern is clear. The UK Treasury 4.125% 2027, which matures in a matter of months, yields 4.24% to maturity. Walk out to the UK Treasury 4.5% 2042 and the yield climbs to 5.46%. Go further to the UK Treasury 1.25% 2051 and it reaches 5.62%.

That rising line is partly a reward for tying up your money for longer. The further ahead you look, the more uncertain inflation, interest rates and government finances become. Investors ask for a higher yield to accept that uncertainty.

Most long dated gilts yield more than the short ones today. The gap is not huge, but it is real, and it is the headline attraction.

Duration risk, explained simply

Here is the catch. The longer a bond's life, the more its price moves when interest rates change. That sensitivity is called duration. A long duration bond is a bit like a long seesaw. A small push at one end creates a big swing at the other.

Why does this happen? When you buy a gilt, you lock in a stream of fixed payments. If rates across the market rise, newer bonds pay more, so your older bond looks less attractive and its price falls to compensate. A bond with 30 years of payments ahead feels that adjustment far more than one with two years left.

You can see the effect in low-coupon long gilts trading well below their 100 repayment value. The UK Treasury 0.875% 2046 sits at just 44.96. The UK Treasury 0.5% 2061 trades at 24.16, less than a quarter of face value. These bonds were issued when rates were near rock bottom. As yields rose, their prices sank hard. Buy one today and you still collect 100 at maturity, so the low price lifts the yield to maturity back to around 5.58% and 5.27% respectively. Getting there, though, means riding out years of price swings.

The lesson works both ways. If market rates fall, long dated gilts can rise in price faster than short ones. That is why some investors buy them deliberately, betting on falling rates. It is a bet, not a certainty.

Running yield versus the full picture

Many long gilts show a modest running yield, which is just the annual coupon measured against the price you pay. The UK Treasury 1.25% 2051 has a running yield of 2.98%, yet a yield to maturity of 5.62%. The difference comes from the slow climb in price from 42 back towards 100 over the years ahead.

If you need steady income to spend each year, the running yield is what lands in your account. If you plan to hold to maturity, the yield to maturity is the number that matters. Knowing which you care about shapes which gilt fits.

Who long dated gilts suit

These bonds are not a cash substitute. They swing in value, sometimes a lot, so they fit particular needs:

• People matching a far-off liability. If you know you need a lump sum in 2049, a gilt maturing that year can lock in a known payout, whatever happens to prices along the way.
• Investors who want to lock in today's yield for decades. A yield near 5.6% held for 25 years is attractive to some, provided you can sit through the volatility.
• Those taking a view on rates. If you believe rates will fall, the long end offers the biggest price response. That view can be wrong.

They suit less well if you might need the money at short notice, or if a 20% or 30% drop in the quoted price would unsettle you before maturity.

A note on index-linked

The data also includes long index-linked gilts, whose payments rise with RPI inflation. The UK Treasury Index-Linked 0.625% 2042 shows a real yield to maturity of 2.29%, meaning that return sits on top of inflation. These protect buying power but carry the same long duration risk, so their prices move sharply too.

The takeaway

Long dated gilts offer the highest yields on the curve because you are being paid to wait and to accept uncertainty. The price you pay for that yield is volatility. Hold to maturity and you know your outcome. Sell early and you are at the mercy of where rates have moved.

Match the maturity to your goal, understand duration before you buy, and never assume a long gilt will behave like a safe cash deposit.

Risk disclaimer: This article is general information, not personal advice. Gilt prices can fall as well as rise, and selling before maturity may return less than you paid. Yields and prices change constantly. Past performance does not predict future results. Consider your own circumstances and seek regulated financial advice if you are unsure.

Important disclaimer

This article is for information only and is not financial advice. Gilt prices and yields move daily and your capital is at risk. Always do your own research or speak to a regulated financial adviser before investing.