However, this interest rate would need to be able to be justified to HMRC. Do companies need to charge interest if a director takes a loan?How do director's loans work? A complete guide to understanding and managing director's loans for business success. This article explores the tax implications of an overdrawn Directors Loan Account, potential tax opportunities, and our recommended actions. You must report the loan on a personal Self Assessment tax return. You may have to pay tax on the loan at the official rate of interest. To document a director's loan to a company, you should start with a formal loan agreement. As a company director you may charge your company interest on the loan. This is usually at a similar rate to a commercial rate of interest.