The frequent delays caused by COVID-19 ballooned the budget to $291 million, making it the most expensive Mission: Impossible film (surpassing Fallout, $178 million), the most expensive film of Tom Cruise's career (again surpassing Fallout), and the most expensive film ever produced by Paramount (surpassing Transformers: The Last Knight (2017), $217 million). The insurance company Chubb originally gave Paramount only £4.4 million (about $5.4 million) for the delays, arguing that the cast and crew could still fulfill their duties to the production despite being infected with COVID-19. Paramount sued Chubb in 2021, and the two companies settled in 2022. In 2023, Chubb gave Paramount a £57 million (about $71 million) payout for the COVID-caused delays, reducing the film's budget to about $220 million, which still makes it the most expensive film for Cruise, Paramount, and the franchise.
When Ethan and Grace meet for the first time at the airport, Tom Cruise insisted on performing the magic trick with the two halves of the key practically. Despite numerous failed takes, the desired effect was ultimately achieved in-camera with little to no visual effects.
When the production wrapped, Pom Klementieff was treated to a skydiving experience by Tom Cruise who dived with her for the initiation jumps.
Director Christopher McQuarrie found Pom Klementieff to be such a self-propelled force of nature on set, she was nicknamed "Pom Cruise" for her gymnastic skills.
While filming in Italy, twelve people on the set tested positive for COVID-19. As a result, when filming resumed in the UK, Tom Cruise personally paid £500,000 for an old cruise ship for the cast and crew to isolate on.