Tax helpline for people affected by severe weather and flooding HMRC have made available a telephone helpline (0800 904 7900) for anyone affected by severe weather or floods. The helpline allows anyone affected to get practical help and advice on a wide range of tax problems they may be facing. These could be financial issues regarding making payment, issues regarding lost or damaged records and may include cancelling penalties where deadlines are missed due to severe weather and flooding. Internet link: GOV.UK helpline