On Friday, Faye Palmer became the eighth housemate to be evicted from the house, leaving the final five of Aaron Allard-Morgan, Alex Rose, Jay Mckray, Tom O'Connell and Louise Cliffe.
As Faye ended her eviction interview with presenter Brian Dowling, the cameras returned to the house to explain the shock development.
Addressing the housemates, Big Brother said: "The £100,000 has been removed from the house.
"The winner will receive £50,000. The other £50,000 must be divided between the five remaining housemates."
As the five finalists looked stunned and glanced back and forth, Big Brother continued: "However, the money will not be divided between the housemates equally. The housemates much choose how much they get. If housemates cannot come to an agreement, the money will be lost."
Speculating about the meaning, Aaron said: "It would be easy to say £11,000, £9,000, £11,000, £9,000, £10,000. But they won't let us do that." A worried Louise commented: "I don't like it."
Dowling then confirmed that the winner will be guaranteed £50,000, while the housemates must allocate pre-determined shares of the remaining £50,000 between themselves.
The cash has been split into portions of £30,000, £15,000, £4,000, £990 and a mere £10.
In another twist, Dowling also revealed that not all five contestants would make it through to the live final next Friday - with the person with the least votes heading home during Thursday's live show.
Saturday night's episode will see the housemates make their decision - and potentially lose £50,000 if they are unable to agree.