UK Money: ISAs, Pensions, Stamp Duty and Bills — 2026-09-17

Top developments

State Pension Uplift and Tax Implications

Official wage growth data released on September 15 confirms that the "triple lock" mechanism will trigger a 3.9% increase in state pension payments next April. This raises the full new state pension to approximately £13,000 per year (£241.30 per week). This figure is critically close to the frozen personal allowance of £12,570, meaning many retirees will face income tax liabilities on their state pension alone unless the allowance is adjusted or tax rules change in the Autumn Budget.

Energy Price Cap Rises to £1,723

Ofgem confirmed that the energy price cap will increase by 4% from October 1, 2026, to December 31, 2026. The new cap sets the annual cost for a typical dual-fuel household paying by Direct Debit at £1,723, up from £1,663 in the previous quarter. Approximately 11 million households on fixed tariffs will be unaffected by this immediate change, but those on default tariffs will see bills rise as winter approaches.

Mortgage Rates Remain Stable at 3.75%

The Bank of England held the base interest rate at 3.75% for the sixth consecutive meeting, ending its period of rate cuts that began in late 2025. This stability provides some certainty for borrowers but keeps mortgage rates elevated compared to historical averages, impacting affordability for first-time buyers and those remortgaging.

Autumn Budget Speculation: ISA and Pension Tax

With the Autumn Budget scheduled for October 28, financial experts are warning of potential changes to tax treatment for pensions and savings. Key areas of concern include the application of inheritance tax to unused pension funds from April 2027 and potential reforms to stamp duty. The Institute for Fiscal Studies and other bodies are calling for a review of stamp duty, suggesting it may be replaced by a more proportionate property tax, though no official announcement has been made.

Local view

The Guardian reports that the decision to maintain the triple lock, despite calls from think tanks like the Resolution Foundation and the FT to scrap it, has been framed as a political necessity ahead of the budget. Critics argue the policy is "unaffordable" and costs billions, while supporters insist it is a vital lifeline against inflation.

The Telegraph notes that Business Secretary Jonathan Reynolds refused four times to rule out taxing the state pension, leaving households uncertain about their net income after the April 2027 uplift. This uncertainty is driving increased interest in personal savings and annuity products among pre-retirees.

Context & numbers

• State Pension: Full new state pension will rise to ~£13,000/year (from ~£12,500). Personal allowance remains frozen at £12,570 until at least 2028.
• Energy Bills: Typical annual bill rises from £1,663 to £1,723 (Oct-Dec 2026). Cash payers face a higher cap of £1,795.
• Interest Rates: Base rate held at 3.75%.
• Stamp Duty: First-time buyer relief currently exempts purchases up to £300,000; above this, rates apply up to £500,000. Changes are rumored but not confirmed.

On the radar

• October 28, 2026: Chancellor John Healey delivers the Autumn Budget. Watch for announcements on capital gains tax, inheritance tax on pensions, and potential stamp duty reform.
• April 6, 2027: New rules take effect charging 22% tax on interest earned from cash held within Stocks and Shares ISAs, aiming to close loopholes created by cash ISA limit cuts.
• Inheritance Tax on Pensions: HMRC technical guidance issued recently clarifies that unused pension funds will be subject to IHT for deaths on or after April 6, 2027, a major shift for estate planning.