A judge granted her request to serve the sentence in increments of 10 days at a jail in South Dakota, where she now lives, ABC affiliate WDAY reported. She will be able to serve the time in either Minnesota or South Dakota, where is now living.
She will serve half of her sentence in prison and half in home confinement.
Even before they filmed the stunt Perez tweeted, "Me and Pedro are probably going to shoot one of the most unsafe videos ever".
Monalisa Perez, now 20, was asked by Pedro Ruiz, 22, to fire a gun from a foot (30cm) away, believing a thick book he held in front of his chest would shield him.
He had experimented previously and thought the thick book would protect him, but the couple's three-year-old child and almost 30 onlookers watched as she fired a fatal bullet.
From a close distance, Perez fired a.50 caliber handgun at Ruiz, who was holding the book to his chest.
Perez accidentally shot Ruiz when making a YouTube video in late June 2017. Come morning, Monalisa and her boyfriend left the house and set up two cameras in their front yard. She will also be on probation for 10 years.
Perez has a YouTube channel with many videos the couple made involving various stunts and pranks.
Part of the sentence is that she is not allowed to financially gain from the video of Mr Ruiz's death.
Perez told a sheriff's deputy that it was Ruiz who had been pushing his idea for the video, which was recorded by one camera on the back of a parked vehicle and another on a ladder, according to the newspaper.
"HIS idea not MINE", she said.
Prior to the stunt, Perez had tweeted her reservations.
Norman County Attorney James Brue said that "this foolish stunt was dreamed up, planned, and executed by Pedro Ruiz, and the defendant wrongfully and tragically relied on his assurances that the stunt was safe".
"We were doing a YouTube video, and it went wrong", a transcript of the 911 call quoted Perez.