They don't answer their phones, and their "customer" service is awful. (Are we "customers"? It's not like we buy anything from them.)
Millions of people may have filled in their tax returns incorrectly because HMRC is failing to answer their calls, MPs have warned as they condemned its its "abysmal" customer service. Half of all calls to the taxman in the first six months of this year were not picked up, equivalent to 12 million unanswered calls.