The issue of Nick McKim's citizenship was raised during the 2017–18 Australian parliamentary eligibility crisis while he was a sitting senator. McKim applied to renounce his UK citizenship by filling out the renunciation form (RN) on 31 July 2015. The form was received by the British Home Office on 14 August 2015, further received for processing on 4 September 2015, and formally registered on 1 February 2016. The Home Office citizenship renunciation guidelines state that a person will cease being a British citizen after the date of registration.