A joint and several liability notice can only be given when four conditions set out in the legislation are met – these are that:
A JLN must be given within two years of HMRC becoming aware that all conditions listed above have been met. Once a notice has been issued, the individual is made jointly and severally liable with the new company for any unpaid tax liability of the new company, as well as any tax liability the new company incurs for five years following the date the JLN was given.
If any unpaid liability remains from one or both of the relevant old companies, the individual is also jointly and severally liable for that amount too.