The Autumn Budget set out a series of reforms designed to address what chancellor Rachel Reeves described as a “financial black hole”, while still sticking to her self-imposed fiscal rules.

One of the key announcements was the introduction of a High Value Council Tax Surcharge on properties valued at £2 million or more, also known as a “mansion tax”.

The measure is expected to hit fewer than 1% of properties in England, the majority of which will be in London. But those it does hit could face a charge of up to £7,500 a year, with pensioners likely to be particularly affected.

While the current proposals are still under review and could change before their implementation, it’s a good idea to start planning for them now.

Read on to find out how the proposed mansion tax will work and what you can do to prepare for it.

The High Value Council Tax Surcharge is set to come into effect from 2028

The new surcharge will be added on top of existing Council Tax and is due to take effect from 2028. It will be tiered according to a property’s value, with four proposed bands with annual charges of:

• £2,500 for properties worth £2 million to £2.5 million
• £3,500 for properties worth £2.5 million to £3.5 million
• £5,000 for properties worth £3.5 million to £5 million
• £7,500 for properties worth over £5 million.

Properties will be valued by the government’s Valuation Office Agency (VOA) throughout 2026.

Although the current Council Tax bands will not change, the government will initially focus on homes in the top three bands (F, G, and H) to identify those valued above £2 million. However, the VOA has since confirmed that the charge could also apply to properties worth more than £2 million, even if they currently sit in lower Council Tax bands.

The government will also have a consultation on what reliefs and exemptions should apply, such as people who are required to live in high-value properties because of their job. However, for most owners of high-value homes, the surcharge is still likely to apply.

Pensioners are likely to be hit the hardest

Although the new charge will affect anyone living in a higher-value property, pensioners are expected to feel the impact the most.

Many retirees rely on fixed or limited incomes and may be asset-rich but cash-poor, making it harder to cover an extra annual cost.

Some homeowners may consider downsizing to avoid the surcharge, but this is not always straightforward. High Stamp Duty costs can make moving expensive, and many people are understandably reluctant to leave a long-standing family home simply to manage a new tax.

There may eventually be options to defer the payment, potentially until the property is sold. However, no such scheme has been confirmed, and even if it were, deferral could mean building up interest over time, which may reduce the value of the estate passed on to beneficiaries.

Planning now can help ensure you’re prepared for the new surcharge

If you’re going to be affected by the new surcharge, it’s important to start planning as soon as you can to build it into your long-term plan.

The following steps can help you prepare.

Determine how much you could be charged

Although the final decision on valuations will rest with the VOA, it’s a good idea to get an early understanding of where your property might fall. This allows you to factor any potential surcharge into your financial plans rather than being caught out later.

You can start with a rough estimate using online valuation tools or get a more precise figure from a professional valuer. Otherwise, you can wait for the official assessment from the VOA, which is expected sometime in 2027, but the earlier you know, the better.

Build the surcharge into your budget

Once you have a sense of what you might owe each year, you’ll need to factor it into your budget so you can cover the cost.

If your property value is close to a band threshold, it’s probably best to plan for the higher tier, as this gives you more flexibility if the final valuation is different than expected.

When budgeting, you may need to make choices about where the money comes from. For example, it could mean reducing contributions to pensions or ISAs, or cutting down in other areas of spending.

A financial planner can help you decide what adjustments make the most sense for your situation.

Assess the effect on your long-term goals

Accommodating the surcharge in your financial plan could affect your long-term goals, so it’s important to understand the impact early. That way, you can stay on track with what matters to you while still meeting the new cost.

This also means factoring the surcharge into your estate planning. For example, if you end up paying the top rate of £7,500 a year, over 20 years, that adds up to £150,000, which could make a significant difference to the value of the estate you eventually leave behind.

A financial planner can use cash flow modelling to show how the surcharge might affect your income, savings, and legacy. This can help you see whether your current plans are still realistic, where adjustments may be needed, and how to balance the costs with your long-term goals.

Consider downsizing

If your lifestyle is likely to be significantly adversely affected by the surcharge, you may want to consider downsizing.

However, it’s important to explore other avenues before this, so speak to a financial planner before making any decisions.

Get in touch

A financial planner can help you map out the long-term impact of the new surcharge on your lifestyle. They can work with you to create a plan that accommodates the costs and helps ensure you remain on track to achieve your financial goals.

To speak to a financial planner, get in touch.

Email info@blueskyifas.co.uk or call us on 01189 876655.

Please note

This article is for general information only and does not constitute advice. The information is aimed at individuals only.

All information is correct at the time of writing and is subject to change in the future.

A pension is a long-term investment not normally accessible until 55 (57 from April 2028). The fund value may fluctuate and can go down, which would have an impact on the level of pension benefits available. Past performance is not a reliable indicator of future performance.