Independent distributors working with multi-level marketing companies must register as sole traders with HMRC once annual profit exceeds £1,000, doing so within six months of their first tax year end or facing penalties starting at £100. Class 4 National Insurance contributions begin once profits go over £12,570, and income tax starts at 20% on profits above the £12,570 personal allowance, with Class 4 National Insurance adding a further 6% on profits between £12,570 and £50,270, and 2% above that. Deductible expenses include free product samples, training courses, conference tickets, business travel, a proportion of home office costs, and marketing materials such as business cards and flyers, all of which reduce the taxable profit figure. Self Assessment returns are due by 31 January each year for the previous tax year, and HMRC can investigate records going back six years if problems are suspected, with penalties ranging from 15% to 100% of unpaid tax depending on the circumstances, though voluntary disclosure before contact from HMRC significantly reduces penalties.