Introduction
The most consequential market move of the past week did not happen in a share price. It happened at the far end of the government bond market, where the longest-dated debt changes hands. On 29 July the US Federal Reserve left interest rates where they were, and the yield on the 30-year US Treasury bond promptly rose to its highest level since 2007. Long-dated UK gilts have been drifting the same way.
That combination, steady short-term rates alongside rising long-term borrowing costs, is called a steepening yield curve. It is one of the least glamorous things markets do and one of the most consequential for anyone holding bonds inside an ISA or a SIPP. Below is what moved, why the long end behaves differently from the short end, and what it does and does not change for a long-term portfolio.
The information provided on this page and throughout the website is for general information purposes only and does not constitute financial advice. Investments can fall as well as rise in value and you may get back less than you put in. Past performance is not a guide to future returns. It is important that you conduct your own research and consider your own personal circumstances before making any investment decisions.
What Happened at the Long End
The Federal Reserve held its target range at 3.50% to 3.75% on 29 July, the fifth meeting in a row without a change. The vote was 9 to 3, with three regional Fed presidents, Lorie Logan, Beth Hammack and Neel Kashkari, preferring a 0.25 percentage point increase. It was the first time since September 2016 that three policymakers dissented in the same direction.
Markets had priced roughly a one in three chance of an increase, so the hold was initially read as dovish and short-dated yields fell. Then the picture inverted. Over the course of the announcement and the press conference that followed, the 30-year Treasury yield rose about 12 basis points to 5.21%, its highest level since 2007. A basis point is one hundredth of a percentage point, so 12 basis points is 0.12%.
The UK curve looks much the same. On 28 July the 30-year gilt yielded 5.67% and the 20-year 5.59%, while the 10-year sat at 4.96% and the two-year at 4.33%. The 30-year yield is roughly 0.24 percentage points higher than it was a month earlier, and close to the levels reached in September 2025, which were themselves the highest since 1998.
The chart below plots the UK gilt curve as it stood on 28 July 2026. It climbs steadily from 4.33% at two years to 5.67% at thirty, so investors are being paid about 1.3 percentage points more each year to lend to the government for three decades than for two.
A curve shaped like that is not unusual in itself. What is notable is how much of the recent movement has been concentrated in the 20-year and 30-year segments while the short end has barely budged.
Why the Long End Behaves Differently
The Bank of England and the Federal Reserve each set one interest rate, and it is a very short-term one. Everything beyond a year or two is priced by investors, and the yield they require has three parts: where they think official rates are heading, what they expect inflation to do, and a term premium, which is the extra compensation demanded simply for tying money up for a long time.
It is the term premium that has been rising, and two forces are behind it.
Central banks are saying less about what comes next. Kevin Warsh, who took office as Fed chair in May 2026, has deliberately stepped back from forward guidance, the practice of signalling in advance what a central bank intends to do. His argument is that markets should respond to incoming data rather than to Fed communication. The trade-off is that less guidance means more uncertainty about the path of policy, and uncertainty is exactly what a term premium is priced to cover.
Governments are borrowing at the long end. Andy Burnham became prime minister on 20 July 2026 and appointed John Healey as chancellor. Burnham’s early remark that he would use any flexibility available within the fiscal rules pushed 10-year gilt yields up around eight basis points to 5.049% and 30-year borrowing costs to their highest level since late May. Bond investors are not casting a political vote when they do this. They are repricing how much long-dated debt they expect to be issued, and the yield at which they are willing to absorb it.
What a Steeper Curve Means for a UK Portfolio
Duration decides how much a bond fund moves. Duration is a measure of how sensitive a bond or bond fund is to changes in interest rates, expressed in years. As a rough rule, a fund with a duration of 15 years loses about 15% of its value if yields rise by one percentage point, and gains about as much if they fall. That is why a long-dated gilt fund and a short-dated gilt fund can move in opposite directions in the same week while both sit in the same portfolio.
The flip side is that higher yields improve the starting point for future returns. A 30-year gilt bought at 5.67% offers a very different long-run income stream from one bought at under 1% in 2020. Falling prices and improving expected returns are the same event described twice, and which description matters depends on whether you are buying, holding or selling. If you want to see how a given yield compounds over a long horizon, our compound interest calculator is a simple way to model it.
Cash rates follow the short end, not the long end. Savings rates are anchored to the part of the curve the Bank of England controls. UK yields at maturities under a year sat between roughly 3.84% and 4.09% on 28 July, and they have not followed long-dated gilts higher. A headline about 30-year borrowing costs tells you very little about what an easy-access account will pay next month.
Equities feel it through the discount rate. Higher long-term yields raise the rate at which investors discount profits expected far into the future, which weighs most heavily on companies whose value sits mostly in later years. That is part of why recent pressure has concentrated in fast-growing technology shares rather than spreading evenly, a pattern we looked at in more detail in our note on the global chip selloff. The UK market’s heavier weighting towards banks, energy and insurers means it does not respond to rising yields the way a technology-dominated US index does.
What to Ignore
Three things are worth filtering out of the coverage.
First, a single day’s move in a 30-year bond is not a forecast. Long yields are volatile and reverse often. The level that matters for a portfolio held for decades is an average over years, not an afternoon.
Second, “highest since 2007” is accurate and less alarming than it sounds. A 30-year yield around 5% sits close to long-run historical norms. The decade of sub-2% yields that preceded it was the unusual period, not this one.
Third, round numbers attract commentary. Nothing mechanical happens when a yield crosses 5%. Yield levels feed into borrowing costs and valuations gradually, not at thresholds.
What to Watch Next
The Bank of England announces its next decision at midday on 30 July 2026, alongside a new Monetary Policy Report. At its June meeting the Monetary Policy Committee voted by a majority of 7 to 2 to hold Bank Rate at 3.75%, with the two dissenters preferring an increase to 4%. The vote split is often more informative than the decision itself, because it shows how close the committee is to moving.
Beyond that, the next UK fiscal event will show how the new chancellor intends to treat the fiscal rules, and for long-dated gilts that is likely to matter more than any single rate decision. On the US side, GDP and inflation data are the next tests of whether the three dissenting Fed presidents were early or simply out of step.
If reviewing the curve prompts you to check what you are actually paying to hold bond funds, our UK broker fees calculator compares platform costs side by side.
Key Takeaways
Short rates held, long rates rose
The Fed left its target range at 3.50% to 3.75% on 29 July in a 9 to 3 vote, yet the 30-year Treasury yield climbed about 12 basis points to 5.21%, its highest since 2007.
The UK curve is steep too
On 28 July the 30-year gilt yielded 5.67% against 4.33% for the two-year, and the 30-year sits roughly 0.24 percentage points above where it was a month earlier.
Term premium is doing the work
Less forward guidance from central banks and open questions about long-dated government borrowing both raise the compensation investors want for lending over decades.
Duration decides the damage
A bond fund with 15 years of duration moves roughly 15% for each percentage point change in yields. Short-dated funds and cash accounts barely register it.
Higher yields cut both ways
Falling bond prices and improving future income are the same event described twice. Which one matters depends on whether you are buying, holding or selling.
Figures in this article were checked against the Federal Reserve Board, the Bank of England June 2026 Monetary Policy Summary and Minutes, CNBC coverage of the 29 July FOMC decision, and Trading Economics over-the-counter interbank gilt yield quotes for 28 July 2026. Yields move continuously, and the levels quoted are those recorded on the dates stated.
The information provided on this page and throughout the website is for general information purposes only and does not constitute financial advice. Investments can fall as well as rise in value and you may get back less than you put in. Past performance is not a guide to future returns. It is important that you conduct your own research and consider your own personal circumstances before making any investment decisions.
