NIM16676 | Class 1A National Insurance contributions: Special Class 1A NICs cases: Beneficial loans: Directors’ loan accounts: General
From HM Revenue & Customs · National Insurance Manual
When reviewing a director’s current or loan account with a company, bear in mind that it is always a question of fact, based on all the evidence available, whether a withdrawal is a:
loan,
earnings; or
a payment on account of earnings.
See NIM12018 for guidance to help identify the type of payment.