Savers could end up paying double tax bills after HMRC sent out multiple demand letters this year, an expert has warned. The first tax bill sent from HMRC did not include any tax owed on savings interest. Some people also then received a second “simple assessment” tax bill, which did include any tax owed on savings interest - but also the amount of tax owed in the first letter, even if it had already been paid. An expert have warned this means some people may end up paying the full amount