UncategorizedGuidance: Annual Tax on Enveloped Dwellings: service availability and issues Check the availability and any issues affecting Annual Tax on Enveloped Dwellings (ATED) online service. Form: Tell HMRC that Inheritance Tax is due on the 10 year anniversary of a trust — IHT100d Apply for a certificate of coverage to pay UK National Insurance whilst working in a country with a social security agreement (CA9107)