Question: what is the difference between class 2 national insurance and class 4?
Answer: Class 2 and Class 4 NICs are charged at different rates. The Class 2 National Insurance contribution is a fixed amount of £3.05 a week and it's only charged if your annual profits are £6,475 or more. Class 4 National Insurance contributions are only charged if your profits are above £9,500 a year.