The New Mansion Tax: What £2m+ Homeowners Need to Know

If your home is worth anywhere near £2 million, there's a new tax heading your way, and a government consultation closing in the next couple of weeks could end up making it wider-reaching than first announced. Here's what the so-called mansion tax actually involves and what's worth thinking about now, well before the first bill arrives.

What the mansion tax actually is

Officially called the High Value Council Tax Surcharge, this new charge was announced by the Chancellor in the Budget on 26 November 2025 and will apply to homes in England valued at more than £2 million. Unlike council tax, which is paid to local authorities, this surcharge goes straight to the Treasury. It will be billed to whoever owns the property, not whoever lives in it, so landlords rather than tenants will be on the hook where a qualifying home is let out.

How much it will cost and when it starts

The surcharge will be added to council tax bills from April 2028, with annual charges expected to range from £2,500 to £7,500 depending on the property's value. That's a meaningful ongoing cost on top of everything else that comes with owning a high-value home, and it's worth factoring in now if you're weighing up a purchase, a sale, or simply your long-term budget for a property already near that threshold.

The consultation that could widen it further

A government consultation is currently open on whether to add a further "non-resident premium" on top of the surcharge for owners who are not UK residents, with officials citing concern that overseas buyers may be adding pressure to high-value markets, particularly in London. That consultation closes on 14 July 2026, so anyone with an interest, whether as an owner, investor, or adviser, has a narrow window left to respond before the policy is finalised.

How buyers are already reacting

The threshold effect is already visible in the data. Estate agency figures reported by the Telegraph show that in February 2026, 83% of offers on homes priced within 10% of the £2 million mark came in below that line, compared with just 64% a year earlier. In other words, a growing number of buyers and sellers are deliberately structuring deals to land just under the surcharge threshold rather than risk it. There have also been reports suggesting the eventual assessment could pay particular attention to features like period detailing, studies and garages when valuing borderline properties, though the exact methodology has not been finalised.

What homeowners should do now

If your property sits close to the £2 million mark, it's worth getting a realistic, up-to-date valuation rather than relying on guesswork, since the difference between just above and just below the threshold could be several thousand pounds a year from 2028 onwards. If you're remortgaging or considering a sale in the next couple of years, factor the surcharge into your long-term affordability and pricing conversations now rather than waiting for the final rules to land.

The takeaway

The mansion tax doesn't bite until April 2028, but the market is already adjusting around it, and the current consultation could still change who exactly ends up paying more. If you own, or are buying, a property anywhere near the £2 million threshold, it's a good moment to get proper advice on how this could affect your plans rather than finding out the details after the event.