Rising bond yields are putting pressure on borrowing costs. Islay Robinson explains what this means for mortgage rates, cross-border property finance and borrowers ahead of the UK Budget.

The yield on the UK 30-year gilt briefly rose above 6% on 1 October, its highest level since 1998, according to Reuters. The US 10-year Treasury also reached its highest level since 2002, while France has become one of the clearest pressure points in the European bond market.

Most of the commentary has focused on London and Washington. I think France deserves more attention.

French government bonds have just had their worst quarter since 1987. The cost of insuring French sovereign debt has reached its highest level since 2013, while 10-year French government bond yields have risen to levels last seen in the early 2000s, according to Reuters.

The French government is now working towards a 2027 budget that aims to reduce the deficit from a projected 5.4% of GDP in 2026 to 5% in 2027, with a €54 billion fiscal adjustment. The scale of the adjustment is significant, and investors remain concerned about whether the political system can deliver it. The French government has confirmed the €54 billion total adjustment in its 1 October 2026 budget announcement.

Why Bond Yields Are Rising

The reasons are not particularly mysterious.

Energy prices have risen sharply as a result of the conflict in the Middle East. Governments are issuing substantial amounts of debt. At the same time, the investment required to build AI infrastructure and data centres is creating additional competition for capital. Reuters has highlighted the combination of energy costs, government borrowing and AI-related investment as factors contributing to the recent global bond sell-off.

The result is that markets are reassessing how quickly interest rates can fall.

The European Central Bank has already raised rates twice this year, in June and September, taking its deposit rate to 2.5%. The ECB confirmed that the deposit facility rate increased to 2.50% from 16 September 2026 in its September monetary policy decision. Markets are currently pricing further increases into 2027.

That is a very different interest-rate environment from the one many borrowers had expected earlier this year.

What This Means for Mortgage Borrowers

For UK borrowers, the transmission mechanism is straightforward and still widely misunderstood.

Fixed mortgage pricing is influenced by market interest rates, which reflect expectations for future interest rates. A lender offering a five-year fixed mortgage is not simply pricing from where the Bank of England's base rate sits today.

It is pricing the expected cost of funding over the period for which that rate is being fixed, alongside its own funding costs, capital requirements and margin. The Bank of England explains that mortgage rates are linked to market interest rates and expectations for the future path of Bank Rate, with lenders also applying a credit spread.

That is why I have said for some time that the base rate is not the only number borrowers should be watching.

This week's bond-market moves are a good example.

The Bank of England could leave Bank Rate unchanged while fixed mortgage pricing still moves because the market's expectations for future rates have changed.

For a borrower considering a large mortgage, that distinction matters.

The Budget Adds Another Variable

The UK Budget on 28 October adds another source of uncertainty. HM Treasury has confirmed that the 2026 Budget will take place on 28 October.

Higher gilt yields increase the government's cost of borrowing and, over time, increase the amount it has to spend servicing its debt. That reduces the room available to absorb additional costs elsewhere and increases the pressure around taxation and government spending.

The Bank of England then announces its next monetary policy decision on 5 November, only eight days after the Budget, as confirmed in the Bank's published MPC schedule.

Nobody knows exactly how markets will react to either event.

That is precisely the point.

Cross-Border Borrowing Makes the Problem More Complicated

For clients borrowing across borders, there is another layer to consider.

A client buying a property in France using sterling income is exposed to French lending costs and sterling income moving independently of one another.

The same applies when someone has assets, income and property exposure across several currencies.

That is a structuring problem before it is a pricing problem.

The question is not simply, “What is the interest rate?”

What currency should I borrow in? What should I fix? For how long? Against which assets? And how does the financing fit with the rest of my balance sheet?

This is where specialist mortgage advice and lender selection become particularly important.

Should You Arrange Finance Before the Budget?

I am asked this constantly.

Should you arrange finance before the Budget or wait until afterwards?

I do not know what is going to be announced in the Budget, and neither does anyone else.

What I do know is that a borrower who has already gone through the process and is holding lender terms has less execution risk than a borrower who has not yet applied.

That distinction matters.

If the market moves against you while you are still deciding whether to apply, you have no protection from the previous pricing environment.

If you already have an agreed facility or lender terms, depending on the structure and validity period, you may have greater certainty over the transaction you are trying to complete. Lender terms are not a guarantee: they can expire or be withdrawn, applying can involve fees, and there is no obligation to proceed.

For a large property purchase or refinance, I would pay more attention to that execution risk than to trying to predict the perfect day to secure a rate.

The Value of Lender Selection

My firm works with more than 1,000 lenders. Enness Global currently has access to more than 1,000 private banks, specialist lenders and international institutions, as outlined on its website.

One of the things that continues to surprise borrowers is how wide the spread can be between the best and worst terms available to the same borrower on the same day.

The difference is not always simply the headline interest rate.

It can come down to loan structure, maximum leverage, asset eligibility, income assessment, currency, repayment flexibility, term, fees and how comfortable a lender is with the overall transaction.

That becomes even more important when markets are moving quickly.

A borrower with a straightforward requirement may have many options. A client buying a £10 million property in France using international income, or refinancing a complex portfolio across several jurisdictions, may have a much smaller pool of suitable lenders.

Finding the right lender can therefore matter more than waiting for a marginal movement in the base rate.

The Dates I Am Watching

There are three dates I would have firmly in the diary.

14 October: US inflation data. The US Bureau of Labor Statistics has scheduled the September Consumer Price Index release for 14 October 2026.

28 October: UK Budget.

5 November: Bank of England monetary policy decision.

None of these dates will tell us exactly where borrowing costs are going next.

But together they could tell us a great deal about how markets are thinking about inflation, government borrowing and the future path of interest rates.

My View

I would not try to predict where rates will be six months from now.

Markets can move faster than borrowers can.

The more useful question is whether the financing available today works for the transaction you are trying to complete and whether you are comfortable with the risks of waiting.

For straightforward borrowers, that may mean comparing fixed and variable options carefully.

For international and high-net-worth borrowers, the decision can be much broader. Currency, which assets are used as security, leverage, lender appetite and the timing of the transaction all need to be considered together.

The bond market is telling us that the cost of long-term money matters.

For borrowers, that is the number I would be watching.

Islay Robinson
CEO and Founder, Enness Global

Risk warning: Your home may be repossessed if you do not keep up repayments on your mortgage.