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From 1 April 2023, the rules are changing such that the rate of corporation tax that a company pays, and when, will be dependent on the level of its profits as well as the number of its associated companies. 
 
From 1 April 2023, standalone companies with profits exceeding £250,000 will be subject to tax at the new main rate of 25%. Companies with profits below £50,000 will continue to be taxed at the current rate of 19%. Companies with profits of between £50,000 and £250,000 will be taxed at the 25% rate but will be entitled to marginal relief. 
 
For groups of companies, the profit thresholds will need to be divided by the number of ‘associated companies’ to determine the rate of tax payable. 
 
The current 'related 51% group company’ rules will be repealed and replaced by associated company rules with effect from 1 April 2023. Accounting periods straddling this date will be split into two notional accounting periods and profits apportioned on a time basis. Profits apportioned to the first notional period will be taxed at 19% accordingly and the tax rate applied to profits of the second notional period will be determined by the number of companies associated at any time from 1 April 2023 until the end of that accounting period. 
 
A company will be associated with another if, at any time in the chargeable accounting period (a) one company has control of another, or (b) both companies are under the control of the same person or group of persons. 
 
This is an extension to the existing rules where, broadly, one company must be a 51% subsidiary of the other or both companies must be 51% subsidiaries of the same company. 
 
This change in definition will now take into account control by individuals and could, therefore, bring into account companies which were previously ignored. For example, an individual directly holding 100% of the shares in four separate trading companies will see all four companies treated as associated from April 2023. Each company will, therefore, become subject to tax at 25% when its profits exceed £62,500 (£250,000/4). 
 
Some group companies do not need to be treated as associated companies including: 
dormant companies; 
passive holding companies (essentially with no activity other than receiving and distribution of dividends); 
companies owned by associates of that person (or persons), providing the relationship between those companies is not one of ‘substantial commercial interdependence’. 
 
To determine control of a company, it is necessary to look at the shares held by a person as well as their associates. An associate would include the individual’s spouse or civil partner, lineal descendants, ancestors and siblings. 
 
On the face of it, therefore, a company owned wholly by one spouse would be associated with a separate company owned wholly by the other spouse, unless it can be demonstrated that there is not substantial commercial interdependence between the two companies. Examples of instances where there may be substantial commercial interdependence include:  
Financial interdependence – including where one company has made a loan to the other or both companies have a financial interest in the same business. 
Economic interdependence – such as both companies having common customers or the activities of one company benefitting the other. 
Organisational interdependence – which could include the two companies employing the same people, having the same management team or sharing premises/equipment.  
 
Tax residence status of the company is not relevant when determining whether it is an associated company and therefore all worldwide companies are included, unless they meet one of the exclusions above.  
 
Here is a useful link to the HMRC website that fully explains the new rules along with a useful calculation tool. https://www.gov.uk/guidance/corporation-tax-marginal-relief 
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