"Millions of properties across the UK could qualify for reduced stamp duty rates, if for example, they have a self contained side annex as part of the property."
Previous research from the firm estimates that over £3 billion worth of stamp duty was overpaid in 2015/16 due to mistakes in advice, and confusing and complex rules.
The latest figures from the Valuation Office Agency show there are now nearly 39,000 annexes in England and Wales alone – an increase of 16% in recent years.
The idea of having grandparents close by is an increasingly attractive option for many families, and equally, an annex has allowed young adults to move back home during lockdown, rather than spending money on renting expensive flat shares in the city.
One lesser known benefit of owning a property with a self-contained annex is that you could be eligible for Multiple Dwellings Relief, meaning you could pay a reduced stamp duty fee.
However, Cornerstone Tax found that 25% of homeowners in Britain who have an annex on their property were not advised that they could have paid a reduced rate of stamp duty on their property at the point of purchase.
David Hannah, principle consultant and founder of Cornerstone Tax, commented: "This research demonstrates a lack of clarity in and around stamp duty land tax, both by the public and by the legal sector. Millions of properties across the UK could qualify for reduced stamp duty rates, if for example, they have a self contained side annex as part of the property. In these cases, solicitors have a duty of care to inform their customers of all potential stamp duty reductions, including where Multiple Dwellings Relief is available.
"The mistakes being made are in almost all cases totally unintentional and otherwise made in fear of underpaying. Most legal professionals are ill-equipped to navigate the complex rules around it and need help.
"The law around SDLT is incredibly complex and many advisors who help homebuyers evaluate how much they should pay are trained only to differentiate between residential and commercial property.
"They simply aren’t familiar with the intricacies of the law’s evaluation criteria, which has led to many being mis-advised unintentionally. There are a number of other reasons why people have overpaid; it’s not always a misinterpretation of the 3% surcharge."
