suttmap Suttmann

My husband has a German pension, Deutsche Rentenversicherung Knappschaft-Bahn See paid through the Deutsche Post. He is German resident in the UK and paid in from September 1967 to November 1982. He then worked in Austria Nov 1982 to April 1990 when he moved to the UK and worked until 2016. He has received his pensions from UK, Germany and Austria since October 2018. Since 2021 he has been paying tax on his German pension at a rate of 4.32%. Now HMRC are taxing him on this pension as well at 20%. Is this correct as we believed that a German state pension of 15+ years should not be taxed in the UK?