Aitken said the starting point for sentencing was three and a half years in prison, but provided reductions for good character, an early guilty plea, and the offer of reparations that saw imposed a final sentence of 12 months home detention, and 300 hours of community service.
SFO prosecutor Todd Simmonds had earlier argued a custodial sentence was required given the collateral damage the offending had caused.
"Harm in a case like this goes much beyond pure financial loss. It goes to significant harm to the reputation and mana of the iwi and Kīngitanga. Those matters are difficult, if not impossible, to quantify - but they are real and tangible," Simmonds said.
Guyon Foley, acting for Whakaruru, said his client had written to King Tūheitia to apologise shortly after pleading guilty and said he had brought "great shame on himself, by his own actions".
Whakaruru remained silent during his sentencing, and left the court at its conclusion to be spirited away to a relative's home in Whakatāne where he'll spend the next 12 months and wear an electronic monitoring ankle bracelet.
The case had been a hot topic in Māoridom, particularly amongst Waikato-Tainui, with both Sir Wira Gardiner and Tukoroirangi Morgan in the public gallery to observe proceedings.
The SFO investigation, and an earlier probe by the Charities Service, had followed an investigation by the Herald into alleged mispending at the King's Office.
Following sentencing, SFO director Julie Read said Whakaruru had "abused his position of trust" and his actions had "compromised the Office of the Māori King".
A rare statement from the Office of the Kīngitanga following the hearing did not mention Whakaruru by name and instead said a "former staff member" had been sentenced after "pleading guilty, in 2019, to serious fraud charges".
The statement said "significant changes" in governance and management had been made in the past year: "We believe we now have processes in place that will prevent any further systemic vulnerabilities."