The singer, 42, attended court in Los Angeles on Friday to face Stephen Belafonte, who she says tormented her with years of physical and mental abuse.
Los Angeles Superior Court was told that the pair both had outstanding tax debts after making "improvident" lifestyle choices, reports telegraph.co.uk.
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Grace Jamra, representing Belafonte, said: "Their lifestyle was extravagant and affluent. She wiped out all her Spice Girls money, approximately $50 million if not more."
According to The Sunday People, the singer's British account Moneyspider Productions has 961 pounds, and was set up in 1997.
Mel B, real name Melanie Brown, appeared in court in high-waisted black trousers and a white shirt with a black tie. She sat at the far side of the court to 42-year-old Belafonte.
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Jacalyn Davis, representing Mel B, spoke of their tax problems, saying they were "sustained through improvident lifestyle choices".
"They never had money at the end of the year to pay their taxes. All their community income was being spent and then some. In this marriage that would be Miss Brown's income from the Spice Girls."
Mel B, who is judging "America's Got Talent", married the film producer Belafonte in 2007, and filed for divorce on March 20 this year, citing "irreconcilable differences".