If the company owes the director money (overdrawn DLA in the director's favour), no tax implications. If the director owes the company more than £10,000 at any point, it's a beneficial loan and a benefit-in-kind (taxable on the director via P11D unless at the official rate of interest). If a loan is outstanding 9 months after the period end, the company pays Section 455 tax at 33.75% — refundable when the loan is repaid. Many one-person companies use DLAs to smooth cash drawings throughout the year.