The 54-year-old actor is accused by ex-partner Oksana Grigorieva of breaching a court order to provide $20,000 a month in child support for their daughter Lucia - who turns one tomorrow (30.10.10) - and if found guilty at a November 10 court hearing Mel could face jail time.
A source told RadarOnline.com: "For three consecutive months, Mel has paid Oksana somewhere between $5,000 and $10,000 each month, it varies, but either way, it is well short of what a judge instructed he must deliver the mother of his child.
Oksana`s attorney Lisa Bloom claimed Mel was a "deadbeat dad" who is trying to "bully" Oksana out of the money he is supposed to hand over to her.
She said: "Mel Gibson, at this point, is a deadbeat dad."
Asked why Mel - who is rumoured to be worth $600 million - had failed to pay the monthly figure, she said: "Because he wants to continue to bully Oksana. This is a pattern of behaviour that has gone on and on and he thinks he can take advantage of the mother of his daughter."
The Hollywood star is reported to be refusing to pay the full amount until a judge decides whether Mel can charge rent on the home in which Oksana and Lucia live.