Tapaitau was born on Rarotonga and educated at Avarua School and Tereora College.[1] He has previously lived in Australia and worked as a builder.[1] He was first elected in the seat of Penrhyn at the 2018 election.[3] Following the election he decided to back the Cook Islands Party government of Henry Puna, and was appointed to Cabinet as Minister of Infrastructure, Environmental Services, Transport, and Outer Islands Special Projects.[4][5]
On 1 October 2020, following the retirement of Henry Puna, he was appointed Deputy Prime Minister.[6] He retained all his Cabinet portfolios.[7] A further reshuffle in June 2021 saw him gain responsibility for Energy, Renewable Energy, Marine Resources and the Outer islands.[8]
On 7 October 2021 Tapaitau stepped aside as a Minister after being charged with conspiracy to defraud.[9] On 17 May 2022 he was reinstated as Deputy Prime Minister and to most of his portfolios, but stripped of his responsibility for the National Environment Services and Infrastructure Cook Islands to avoid a conflict of interest with his ongoing criminal trial.[10][11]
On 31 January 2024 he was convicted of three charges of using a document to obtain a pecuniary advantage and one charge of conspiracy to defraud.[14][15] He lost his seat in parliament as a result of his conviction, triggering the 2024 Penrhyn by-election.[16] In March 2024 he was sentenced to two years and nine months imprisonment.[17]