Out of form in ODIs and with his spot in that side in doubt, national white-ball skipper Finch has confirmed Sunday's fixture against New Zealand will be his last in the format for Australia.
Due to his consistent form in T20s, backed by his batting average this year, he's confident about leading Australia's side in pursuit of back-to-back triumphs in that format.
"My T20 form has been pretty good for a little while now, totally different format," he said.
"Over the last little while my numbers in T20 have been reasonably good and ODIs haven't.
"It will be a really exciting time and to have that World Cup in Australia again is going to be really special trying to defend that."
Whether he continues in the 20-over format after the World Cup and summer's Big Bash League will be a decision for another day, he said.
For now his focus remains on a T20 title defence on home soil.
"I'd like to," Finch said of whether he'd continue in T20s following the summer schedule.
"Being able to spend a little bit more time at home with (wife) Amy and (daughter) Esther, watching her grow up as well is important.
"My family sacrificed a lot for me to be able to do what I've done, and what I've loved doing, so it's probably my turn to repay the favour a little bit."
Australia's leader since 2018, Finch has played 145 ODI matches - 54 as captain.
One of the most damaging opening batters in the world when at his best, he has made over 5000 runs in the format and averaged close to 40.
But those numbers have taken a significant hit in recent years, averaging 14.6 in 2022 while failing to pass 20 in his last seven innings.
His form in T20s paints a different picture, averaging 30.87 this year atop the order.
However, the call to retire from ODIs came after his fifth duck across all formats this year.
Finch debuted against Sri Lanka in 2013, with his 17 centuries fourth behind only Ricky Ponting, David Warner and Mark Waugh in one-day cricket for Australia.
The right-hander played a key part in Australia's 2015 one-day World Cup success before leading the team to the semi-finals in the 2019 tournament.
Finch's decision leaves Australia searching for a new one-day captain ahead of next year's World Cup, with Test skipper Pat Cummins previously indicating he does not want to lead the side.
Finch said he sees no issue with former captain Steve Smith retaking the reins four years after the sandpaper-gate scandal had him stripped him of the role.
But he also said Cummins has the leadership qualities to manage both the Test and ODI sides.
"Whichever way they go, which I've absolutely got no idea, it'll be for the betterment of the team no doubt," he said.
David Warner has been released from the squad ahead of Sunday's dead-rubber final ODI against New Zealand due to a heavy workload ahead while Marcus Stoinis has been ruled out of the game with a low-level side strain and will return to Perth for rehab ahead of the series against India.
Nathan Ellis has joined the squad.
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