Pakistan, Oct. 13 -- Sia's estranged husband is demanding more than $250,000 per month in spousal support.

The 49-year-old singer filed for divorce from her husband, Dan Bernard and cited "irreconcilable differences" as the reason.

Now, according to court documents obtained by Us Weekly, Dan wants Sia to pay at least $300,000 towards his attorneys' fees, as well as $200,000 for a forensic accounting investigation.

He said in a written statement to the court: "I have no income, no real property, no retirement and very little funds in my bank account."

Dan continued, "I cannot maintain this litigation without a significant contribution by Sia toward my attorneys' fees and forensic accounting fees. Sia has the greater ability to pay for ...