The Annual Tax on Enveloped Dwellings (ATED) is a tax that applies to high-value residential properties owned by companies, partnerships with corporate members, or collective investment schemes in the UK. It was introduced in 2013 and mainly targets properties valued above £500,000 that are owned through a corporate structure, rather than by individuals.
A crucial part of ATED is the Valuation Rule, which determines how to assess the value of a property for tax purposes. This rule is significant because the amount of ATED tax owed depends directly on the value of the property. The following section explains the ATED valuation rules, including how property values are determined, when valuations are required, and the effect of valuations on the tax liability.
ATED: Key Considerations: Valuations
The Annual Tax on Enveloped Dwellings (ATED) tax year runs from 1 April to 31 March, and the tax return must be filed within a set period after the end of the tax year. The valuation of the property is a key factor in determining the amount of ATED annual charge payable.
The valuation rule refers to the method of determining the market value of a residential property for the purposes of ATED. The valuation is a fundamental aspect because the amount of ATED owed is based on the value of the property, and properties above a certain threshold are subject to the tax.

Key Valuation Dates for ATED
The Valuation Rule is tied to specific dates that establish when and how a property should be valued for ATED purposes:
- 1 April 2012: This is the initial valuation date for properties that were owned on or before this date. When ATED was first introduced, the market value of these properties on 1 April 2012 determined whether the property was subject to the tax.
- Acquisition Date: If the property is purchased after 1 April 2012, the valuation date becomes the date of acquisition, meaning the market value on the day the property is bought determines the ATED liability.
- Five-Year Revaluation Cycle: After the initial valuation, properties must be revalued at least every five years. The most recent revaluation date was 1 April 2022, and the next revaluation date is 1 April 2027. If a property is purchased before the end of a five-year period, it must still be revalued according to the standard five-year cycle, not the remaining years. For instance, if the property is valued in 2024, the next revaluation will still occur in 2027, not 2029.

The value of the property for any chargeable period is therefore the later of:
- its initial valuation date
- the revaluation date
The five-year cycle ensures that the valuation reflects current market conditions and is crucial for maintaining the accuracy of tax liabilities over time.
When Revaluation Is Required
Revaluation is necessary under certain circumstances, such as:
- Initial Valuation: For properties owned on 1 April 2012, or after this date, the value must be established as of the acquisition date or 1 April 2012, as applicable.
- Five-Year Cycle: Properties must be revalued every five years, ensuring the tax reflects any changes in the market.
- Significant Renovations or Disposals: If a property undergoes major renovations or improvements that significantly increase its value, or if a substantial portion of the property is sold or disposed of, a revaluation may be required before the five-year mark.
Major Renovations and Disposals
A substantial acquisition or disposal triggers a revaluation for ATED purposes. For example, if a property was valued at £5 million on 1 April 2012, and the owner sold part of it (like a small piece of land) for £200,000 on 30 August 2014, the revaluation would not simply be £4.8 million (the original value minus £200,000). Instead, the property would need to be revalued based on the market value of the remaining interest as of the disposal date, which could even change its value significantly.
An acquisition is considered “substantial” if the buyer pays £40,000 or more for the property or any part of it, including any linked transactions.
A disposal of part of the property (but not the whole property) is considered “substantial” if the value of the part sold is £40,000 or more.

Transactions Between Connected Parties
If the transaction involves connected parties (such as family members, friends, or businesses with shared interests), special rules apply. In such cases, the market value of the property is used for ATED purposes, not just the price agreed upon between the parties. This is to prevent under-reporting of the property’s value, ensuring that the tax is based on a fair and accurate valuation.
Valuing the Property: How to Proceed
You have two options for valuing your property:
- Self-Valuation: You can personally assess the value of the property, but it must reflect the market price that a willing buyer and seller would agree upon.
- Professional Valuation: Hiring a professional property value is another option, which may offer more assurance regarding the accuracy of the valuation.
The key point here is that the valuation should be reasonable and justifiable. HMRC will usually accept self-valuations but may challenge them if they believe the valuation is incorrect.
