Why does IN-SYNC Tax complete HMRC checks for every client? 27 March 2019 23:06 Updated Follow We complete HMRC checks to ensure that there is nothing on a client's HMRC account which could affect their refund. Related articles What information do you need to complete my Tax return and pay my rebate? Why is my trip not showing up in my New list? Why do I need to buy a vehicle before the 31st of March to reduce my tax liability? Can I get my Tax refund early? Can you produce a set of profit and loss accounts?