Then sales grew, the payouts got confusing, and the tax questions started piling up. They only look for accountants for Amazon sellersafter a VAT problem, a surprise tax bill or a letter from HMRC. This guide covers seven clear signs it’s time to get professional help, the UK rules behind each one, and a checklist to help you decide. Why Amazon Selling Is Harder to Account For Amazon doesn’t pay you the way a normal customer does. If you only track what lands in your bank account, your figures will be wrong, which can mean overpaying tax or underpaying VAT.