Labour leader David Shearer says his failure to declare a US-based bank account with more than $50,000 in it on the MPs' Register of Pecuniary Interests was simply an oversight.
Mr Shearer yesterday asked the Registrar Dame Margaret Bazley to belatedly add the account at Chase Bank in the United States to his entry in the register, where MPs are required to list their assets, debts and gifts.
Chase Bank had a branch in the UN Building in New York and he used the account for his salary while he worked with the United Nations.
Mr Shearer would not reveal how much was in the account, but MPs are required to include accounts with more than $50,000 in them.
He was in a senior role at the UN and is understood to have been in the top tiers of salary earners partly because of his work in dangerous areas, such as Iraq.