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This month: Rising UK borrowing costs

1️⃣ Gilts and yields, explained

2️⃣ What's happening right now

3️⃣ The impact on mortgages

4️⃣ The outlook for savers

5️⃣ Why it matters for the government

6️⃣ Steps you can take now

Why UK borrowing costs are climbing - and what it means for your money

You may have seen headlines about UK "gilt yields" hitting their highest level since 2007. It sounds like a story for economists, not for household finances - but it isn't.

Gilt yields sit quietly behind some of the biggest numbers in your financial life: what your next mortgage deal will cost, what your savings could earn, and how much room the government has available to spend without raising taxes.

1️⃣ Gilts and yields, explained

A gilt is simply a UK government bond - the government borrows money from investors and promises to pay it back later, with interest along the way. The "yield" is the effective interest rate the government has to offer to get investors to lend.

When yields rise, it means investors are demanding more to lend the government money. And because gilt yields act as a reference point for borrowing costs right across the economy, when they go up, it tends to push up the cost of mortgages too - even before the Bank of England changes its own interest rate.

2️⃣ What's happening right now

As of early September, the 10-year gilt yield has climbed above 5.25% - its highest level since 2007, and roughly half a percentage point higher than a year ago. Longer-dated gilts have moved even further: the 30-year yield is now close to 5.9%. So what’s behind the move?

• Oil prices have surged. Renewed tensions in the Middle East have pushed Brent crude toward $95 a barrel, raising fears of higher inflation ahead.
• Inflation expectations have hardened. UK shop-price inflation has accelerated to its highest level in two years, and CPI inflation ticked up to 2.9% in July.
• Central banks sound more ‘hawkish’. Markets are now pricing in a strong chance of a Bank of England rate rise by November, with a further move possible by early 2027 - a reversal from the rate-cutting mood of the past couple of years.
• It's a global move, not just a UK one. Bond yields have risen across major economies as investors reassess how long interest rates will stay elevated.

In short: markets now think borrowing costs will stay higher for longer, and they're pricing government debt accordingly.

💡 Top tip: Gilt yields move constantly, so today's figures will look different by the time you read this. What matters for your own planning is the direction of travel, not the exact number on any given day.

3️⃣ The impact on mortgages

Most fixed-rate mortgages aren't priced directly off the Bank of England's base rate - they're priced off "swap rates," which track gilt yields closely. When gilt yields rise, lenders' funding costs rise too, and new fixed-rate deals tend to get more expensive within days, sometimes before the Bank of England does anything at all.

We're already seeing the knock-on effect: mortgage approvals have fallen to their lowest level since 2024, and mortgage borrowing dropped sharply in July, as buyers and remortgagers hold back or face pricier deals.

• If your fixed deal ends in the next 6-12 months, it's worth reviewing your options early rather than waiting - many lenders let you lock in a new rate months ahead of your renewal date.
• If you're a first-time buyer, it's worth stress-testing affordability against a slightly higher rate than you might currently be quoted, in case rates move further before you complete.
• Tracker and variable-rate mortgages are more directly tied to the Bank of England's base rate, so they wouldn't move on gilt yields alone - but they would be affected if the anticipated rate rise actually happens.

4️⃣ The outlook for savers

It isn't all bad news if you're a saver. Higher yields and rate expectations tend to filter through to better returns on cash over time, particularly on fixed-term savings bonds and cash ISAs, as providers compete for deposits.

• Fixed-term savings can become more attractive when yields are elevated, since you can lock in a rate before it potentially falls back again.
• UK gilts themselves are also available to individual investors, and at current yields, can offer a relatively attractive, low-risk return - especially inside a tax-efficient wrapper.
• Easy-access rates tend to move more slowly and more closely track the Bank of England's actual base rate decisions, rather than the bond market's expectations.

As ever, it's worth comparing what's on offer rather than assuming your existing savings account is still competitive.

💡 Did you know: The Bank of England's base rate currently stands at 3.75%. Markets are pricing in roughly a 70% chance of a rate rise by November - a notable shift from the rate-cutting expectations of the past couple of years.

5️⃣ Why it matters for the government

Andy Burnham became Prime Minister in July, and rising gilt yields land squarely on his desk. Higher yields mean the government itself pays more to borrow and to service its existing debt - which eats into the amount available for spending pledges without raising taxes elsewhere.

That's a difficult backdrop for any new government, and it's likely to shape the choices made in the new Prime Minister's first Budget.

Cost of living and household finances were already flagged as an early priority for the new administration. Rising mortgage costs and stretched household budgets make that pressure more immediate, not less - and it's a dynamic worth watching over the coming months, regardless of your political views.

6️⃣ Steps you can take now

None of this calls for drastic action, but a few sensible steps can help:

• Review your mortgage renewal date and start comparing deals early if it falls within the next year.
• Check whether your savings are still earning a competitive rate, particularly if it's been a while since you last compared providers.
• Build some flexibility into your budget in case borrowing costs move further before they settle.
• Avoid overreacting to daily headlines - gilt yields are volatile day to day, but what matters for your finances is the medium-term trend.

Summary

Gilt yields might sound like a topic for the financial pages, but they sit behind two of the biggest numbers in your household finances: your mortgage rate and your savings return. With yields at their highest in almost two decades, it's a good moment to review both - and to keep an eye on how the new government responds in the months ahead.

Your Bippit coach can help you work through what rising rates mean for your mortgage timing, your savings strategy, and your wider financial plan.