Starmer resigns: what the leadership change means for mortgage rates

What happened: Starmer resigns, Burnham emerges as favourite

On Monday 22 June 2026, Prime Minister Keir Starmer announced his resignation as Labour leader in a statement outside 10 Downing Street, telling his party he had “heard the answer” of his MPs and accepted it “with good grace”. He said he would stay on as a caretaker Prime Minister until a Labour leadership contest chooses his successor.

Starmer asked Labour’s National Executive Committee to set the timetable, with nominations opening on 9 July and closing on 16 July. An uncontested race would be settled at the close of nominations; a contested ballot is targeted to finish by 1 September, before Parliament returns. To reach the ballot a candidate needs the backing of 20% of Labour MPs — about 81 of roughly 403 — plus 5% of constituency parties or at least three affiliates.

The resignation followed months of pressure after the rise of Reform UK and Labour’s heavy losses in May’s local elections, where the party shed close to 1,500 council seats. Andy Burnham, the Mayor of Greater Manchester, declared his candidacy on 22 June and is widely seen as the frontrunner, having won the Makerfield by-election on 18 June with 54.8% of the vote and a majority of more than 9,000. Former Health Secretary Wes Streeting confirmed he would not stand and endorsed Burnham. If confirmed, the next leader would be the UK’s seventh prime minister in roughly a decade.

The market reaction: measured, not a 2022-style rout

Markets largely took the news in their stride, because the change had been widely anticipated. After Starmer’s statement the 10-year gilt yield eased to around 4.82%, with intraday prints near 4.85% — still close to its highest since the 2008 financial crisis. The 30-year gilt sat around 5.50%, well below its May peak; sterling was roughly flat at about $1.32, and the FTSE 100 edged higher.

Analysts put the calm down partly to Burnham’s pledge to keep the current fiscal rules. “It does seem like there could be a smooth transition and because Burnham has said he will not change the fiscal rules, markets are moving on,” said Michael Metcalfe, head of macro strategy at State Street Markets. Ruth Gregory, deputy chief UK economist at Capital Economics, added that markets had “mostly shrugged off the news”, consistent with a resignation that was widely expected.

The open question is what kind of race follows. “The question is, is it going to be a coronation or a contest?” said Jeremy Stretch, head of G10 currency strategy at CIBC. A drawn-out, unpredictable contest would give markets more to worry about than a quick, orderly handover.

Where the gilt market has been: a turbulent spring

The June calm followed a volatile spring. In early-to-mid May the 30-year gilt yield surged to about 5.78%, its highest since 1998, while the 10-year topped roughly 5.1% — its highest since 2008 — driven by speculation over Starmer’s leadership, anxiety over the fiscal rules and the energy-price effects of conflict in the Middle East. At the peak, markets were briefly pricing in as many as three to four Bank of England rate rises.

Goldman Sachs attributed the sell-off to political uncertainty and a rising “term premium” rather than worsening public finances, noting that investors lacked conviction the fiscal rules would hold and that softer demand from UK pension funds for long-dated bonds added pressure. More than a quarter of UK government debt is held by overseas investors, who tend to demand higher returns when politics and the fiscal outlook look uncertain.

After Burnham’s by-election win on 18 June, gilts and swap rates rose around 10 basis points and then held, with the 10-year jumping more than eight basis points in a single day to about 4.84%. Neil Wilson of Saxo noted the spring spike had taken yields to “28-year highs for the 30-year, 18-year highs for the 10-year”, but said the reaction to the by-election “was to offer gilts, but the moves were contained”.

The fiscal backdrop: weak public finances raise the stakes

The handover lands against strained public finances. UK public sector net borrowing was £23.3 billion in May — £5.6 billion above the Office for Budget Responsibility’s forecast and the second-highest May borrowing on record. Central government debt-interest payments hit £11.7 billion, up more than half on a year earlier and the highest for any May on record.

Borrowing in the financial year to May reached £46.3 billion, well above the OBR’s forecast, while public sector net debt was provisionally 95.1% of GDP — a level last seen in the early 1960s. Danni Hewson, head of financial analysis at AJ Bell, called the figures “a chillingly well-timed reminder to any would-be prime minister that the bond markets matter when a country is carrying as much debt as the UK currently is”.

The sensitivity is real. The OBR has estimated that a sustained one-percentage-point rise in the base rate and gilt yields would weaken the public finances by around £16 billion by 2029-30, against fiscal headroom of roughly £21.7 billion set at the November 2025 Budget — which is why markets watch every signal on borrowing so closely.

Mortgages: base rate held, fixes easing, best-buys near 4.3%

The Bank of England held its base rate at 3.75% on 18 June — a fourth consecutive hold — with the Monetary Policy Committee split 7-2, two members preferring a rise to 4%. CPI inflation was 2.8% in the year to May, still above the 2% target. The next decision is due on 30 July.

Average fixed rates have been edging down. As of 23 June, Moneyfacts data put the average two-year fix at about 5.5% and the five-year at about 5.6%, with the average standard variable rate at 7.13% — though figures vary by provider and methodology. Best-buy deals are lower: the cheapest two-year fix was around 4.30% and the five-year around 4.33% at 60% loan-to-value, while the only sub-4% deal of any kind was a tracker at 3.96%, which is variable rather than fixed.

Crucially, fixed pricing follows swap rates, not the held base rate — and after Starmer’s resignation swap rates rose only marginally, by about one to two basis points, because the exit was largely expected. That is why the political headlines have, so far, had little direct effect on what it costs to fix.

The 2026 refinancing wave

Around 1.8 million fixed-rate mortgages are due to expire in 2026, up from 1.6 million in 2025 — including close to a million five-year fixes taken out in 2021 at ultra-low rates. UK Finance expects remortgaging to grow around 10% to £77 billion and internal product transfers to rise to £261 billion, so refinancing will dominate the market this year. Mortgage arrears, meanwhile, are forecast to fall further, to about 87,500 cases.

The cost of inaction can be significant. Moneyfacts calculated earlier in 2026 that moving from a standard variable rate of around 7% to a sub-4.3% two-year fix could save a borrower with a £250,000, 25-year mortgage more than £5,000 over a year — illustrative, but a useful sense of the gap between an SVR and a competitive fix. “Even with welcome tweaks to lending regulations this year, affordability is now very tight and this is likely to limit borrowing options,” said James Tatch, head of analytics at UK Finance.

There is more room to shop around than there was in the spring. Mortgage product choice has climbed back above 7,000 for the first time since March, and the average deal now stays on the shelf for about 15 days, up from eight in early April, according to Moneyfacts — a sign that the swap-rate volatility which forced rapid repricing has eased.

Proposals on the table — not policy

Several housing and tax ideas associated with Burnham are proposals, not government policy, and should be read that way. He backs a proportional property tax that would replace stamp duty and council tax with an annual charge of 0.48% of a home’s value (0.96% for second homes, foreign-owned and empty properties), paid by owners rather than tenants — on a £300,000 home, that would be about £1,440 a year. Knight Frank’s Tom Bill cautioned that annual revaluations “would turn house price growth into a tax liability”, and that discouraged landlords could mean “less stock and higher rents”.

Burnham has also argued for rent controls — a “double lock” capping renewal increases at the lower of inflation or local wage growth — and for the “biggest generation of council housebuilding since the second world war”, pointing to a target of 500,000 social-rent homes by the end of the decade. For scale, fewer than 65,000 affordable homes were completed in England in 2024-25.

The only confirmed property-tax change is the high-value council tax surcharge — a “mansion tax” from the November 2025 Budget — applied to English homes worth over £2 million at £2,500 to £7,500 a year, collected from April 2028 and affecting an estimated 150,000 to 165,000 households. Broader stamp duty reform was ruled out at that Budget, though a Commons committee has urged the government to consult on alternatives before the end of 2026.

Is this “Liz Truss 2.0”? Why analysts say no

The obvious comparison is the September 2022 mini-Budget, when £45 billion of unfunded tax cuts with no independent forecast triggered a violent sell-off: the 30-year gilt yield jumped about 1.2 percentage points in three trading days, the pound hit an all-time low of $1.0327, and the Bank of England stepped in with emergency gilt purchases. The mortgage fallout was severe — lenders pulled hundreds of products in a single day and the average two-year fix climbed above 6% for the first time since 2008.

Analysts argue 2026 is different. AJ Bell’s Laith Khalaf notes that although long-dated yields are now higher than the 2022 peak, the rise has been gradual rather than sudden, is driven by global forces such as sticky inflation and heavy bond supply, and is concentrated at the long end of the curve — away from the shorter maturities that feed most directly into mortgage pricing. Pension-fund reforms since 2022 have also made a forced-selling spiral far less likely.

That said, the structural fragility keeps markets watchful — net debt near 95% of GDP, a large gilt-issuance programme this year, and some of the highest long-term borrowing costs in the G7. ING estimated the political risk premium in 10-year gilts had crept up to around 15 basis points, and warned that a leader pursuing more expansionary spending “could pose further upward pressure on rates”. As Richard Carter, head of fixed interest research at Quilter Cheviot, put it, the market has a clear preference.

What it means for your mortgage

For now, the practical picture is steady. The base rate is unchanged at 3.75%, so anyone on a tracker or about to roll onto a lender’s standard variable rate (averaging 7.13%) sees no change from this month’s decision. Fixed rates are set by swap rates rather than the base rate, and swaps barely moved on the political news — so the resignation itself has had little immediate effect on what you’d pay to fix.

If your current deal ends within the next six months, it can make sense to review early. You can usually secure a new rate now and still switch if something cheaper appears before it starts, and with around 1.8 million fixes maturing this year — many from the ultra-low deals of 2021 — a fair number of borrowers face a step up in payments. You can model the numbers with the repayment calculator, and a Clearview adviser can compare deals across the whole market and line one up for you.