Until recently, if more than 51 percent of the shares in a company changed hands, any company losses were no longer available to be set off against future years’ profits.
The law is being changed. Effective for the 2021 year (for most people 31 March 2021) you need only to make sure there is no major change in the company business when the new shareholders take over.
Permitted changes include:
Losses incurred before the 2014 year will still need to be written off. There are several complications and special cases, so if this affects you, get advice.