Hi Philip Wilson,
There is no legislative definition of a lump sum but HMRC regards these as being any non-periodic payment of a pension, that is, any non-regular payment that decreases the value of the remaining pension pot after such payment is made. For example, the first (IRA) withdrawal is taken in year 1, the next withdrawal was made in year 5, and another withdrawal in year 7; such payments will not be regarded as periodic and will be treated as lump sum’s under the UK/USA DTA. Whereas any amount withdrawn in set, periodic, frequent intervals (e.g. weekly, monthly, annually etc.) would not be a lump um, but rather periodic payments.
Article 17(2) of the UK/USA DTA provides the US with the right to tax any lump sum payment which is made from a US sourced pension scheme, including IRAs. However, the UK is also permitted to tax the same lump sum payment(s), which is in accordance with Article 1(4) of the DTA, both Article 17(2) and Article 1(4) are outlined below and, when read from the perspective of a UK resident, state:
Article 17(2) - Notwithstanding the provisions of paragraph 1 of this Article, a lump-sum payment derived from a pension scheme established in a Contracting State, USA and beneficially owned by a resident of the other contracting state, UK shall be taxable only in the first-mentioned State, USA.
Uk/USA Double Taxation Agreement - 2002
Thank you.