But the star may avoid going to court after Crown Prosecution Service lawyers advised police to let him off with a caution if he pleads guilty to the attack.
If Bale claims he is innocent, he could still be charged over the incident.
The 34-year-old star's outburst came after his mother and sister apparently asked him for £100,000 to help Sharon raise her children.
Bale was said to have "flipped out" over the request - made at his suite in London's Dorchester Hotel the day before he was due to attend the UK premiere of 'The Dark Knight' - and was accused of attacking the pair.
He turned himself over to police for questioning two days later after the women made a complaint against him.
Christian Bale could escape assault charges with a caution.
