Bond markets are tanking. Why?

Bond markets are sinking, with bond yields climbing rapidly. But equity markets are nervous, too – breaking the inverse correlation usually seen between the two. As a result, the well-known 60-40 diversification rule is broken.

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

There’s something of a meltdown going on in the fixed-interest bond markets, currently. And I’m talking globally.
 
Here in the UK, as I write these words, the yield on ten-year bonds stands at 1.96%: up significantly since the end of last year. Gilts — government fixed-interest bonds — have a similar story to tell.

A chart that I’m looking at on the Financial Times website right now tells me that the UK yield curve for ten-year bonds is up almost 0.5 percentage points in the last month. In the United States, the equivalent figure is closer to one entire percentage point.
 
That’s quite something.

Yield up, prices down

Now, because bond market commentators always talk in terms of yield — mirroring how bonds are ‘priced’ — it’s easy for investors who aren’t bond-savvy to misinterpret what rocketing yields are really saying.
 
What they aren’t saying is that this rising yield is good news for bond investors. Far from it.
 
Fixed-interest bonds are fixed-interest, remember. So the price at which you buy a bond or gilt locks in the return that you’ll get from the periodic ‘coupon’ (as it’s called) that you’ll be paid.

Think of it like a dividend that never changes, however long you hold the share in question.
 
So for yields to go up — and this is the crucial point — bond prices have to go down. Which is what’s happening at the moment.
 
The UK iShares Corporate Bond Index is down 6.5% since the start of the year. Vanguard’s Global Bond Index is down 7.4%.
 
And in the staid world of bonds and gilts, those are big swings. In both yield, and prices.

Fixed interest is, well, fixed-interest

Now, why is it happening? Simple: as I say, fixed-interest bonds (and gilts) are fixed-interest bonds.

Meaning that when inflation rears its ugly head — as it is doing right now, of course — then the value, or purchasing power, of those fixed-interest coupon payments declines.

Bond markets can live with low-level, predictable inflation: markets just factor that into the price, inside the various sophisticated computer models that bond traders possess.

But what bond markets struggle to deal with is the roaring inflation that we’re seeing at the moment — which, post-Ukraine, could climb much, much higher yet.

And faced with such uncertainty, bond prices are plunging.

So what does it all mean?

Two things.
 
First, the capital that’s being pulled out of the bond markets has to go somewhere. And it’s going into equity markets, helping to prop up share prices.

So if you’ve been wondering why share prices have been holding up so relatively well, post-Ukraine — and especially in the context of a post-Ukraine energy shock — then that’s your answer: in inflationary environments, shares tend to offer rather more inflation protection.
 
Second, bond markets and equity markets are normally inversely correlated: when one goes up, the other goes down — which is why the well-known 60-40 asset allocation ‘rule’ (60% shares, 40% bonds) works so well for diversification and capital protection purposes.
 
Except that this inverse correlation isn’t happening now, though: the link is broken. And in fact, following the 60-40 rule could actually lose you money.

Bond bargains ahead?

It depends what you mean by ‘bargain’.

At some point bonds will be cheap (or rather, their yields will be higher than they are now, in other words). Inflation will be tamed at some point, and bond prices will have sunk to new lows.

But I reckon that it will be a brave private investor who buys in at that point, having seen first-hand just how quickly bond investors can see their capital evaporate as inflation takes hold — which of course, it might very well do.

Certainly, I won’t be buying supposed ‘bargains’ in the bond market.

Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

More on Investing Articles

Yellow number one sitting on blue background
Investing Articles

I asked ChatGPT to pick 1 growth stock to put 100% of my money into, and it chose…

Betting everything on a single growth stock carries massive danger, but in this thought experiment, ChatGPT endorsed a FTSE 250…

Read more »

Portrait of pensive bearded senior looking on screen of laptop sitting at table with coffee cup.
Investing Articles

How little is £1,000 invested in Diageo shares at the start of 2025 worth now?

Paul Summers takes a closer look at just how bad 2025 has been for holders of Diageo's shares. Will things…

Read more »

Aston Martin DBX - rear pic of trunk
Investing Articles

After a terrible 2025, can the Aston Martin share price bounce back?

The Aston Martin share price has shed 41% of its value in 2025. Could the coming year offer any glimmer…

Read more »

Close-up of British bank notes
Investing Articles

How much do you need in an ISA to target £3,000 per month in passive income?

Ever thought of using an ISA to try and build monthly passive income streams in four figures? Christopher Ruane explains…

Read more »

piggy bank, searching with binoculars
Investing Articles

Want to aim for a million with a spare £500 per month? Here’s how!

Have you ever wondered whether it is possible for a stock market novice to aim for a million? Our writer…

Read more »

Investing Articles

Want to start buying shares next week with £200 or £300? Here’s how!

Ever thought of becoming a stock market investor? Christopher Ruane explains how someone could start buying shares even on a…

Read more »

Rear view image depicting a senior man in his 70s sitting on a bench leading down to the iconic Seven Sisters cliffs on the coastline of East Sussex, UK. The man is wearing casual clothing - blue denim jeans, a red checked shirt, navy blue gilet. The man is having a rest from hiking and his hiking pole is leaning up against the bench.
Investing Articles

2 ideas for a SIPP or ISA in 2026

Looking for stocks for an ISA or SIPP portfolio? Our writer thinks a FTSE 100 defence giant and fallen pharma…

Read more »

Midnight is celebrated along the River Thames in London with a spectacular and colourful firework display.
Investing Articles

Could buying this stock at $13 be like investing in Tesla in 2011?

Tesla stock went on to make early investors a literal fortune. Our writer sees some interesting similarities with this eVTOL…

Read more »