Madonna could earn $1 billion - making her the third richest female entertainer in the world - by signing up for a five year residency in Las Vegas.
The 'Celebration' singer is said to be in discussions with promoters to establish a run of shows in the glitzy US gambling capital.
If the rumours of the contract being worth $1 billion are true, it would push 52-year-old Madonna up the list of highest earning females in the world. Currently, with an estimated fortune of £208 million, she is in fourth place behind talk show host Oprah Winfrey, host and publisher Martha Stewart and British 'Harry Potter' creator Jk Rowling.
It is not known if a Las Vegas residency would conflict with the 'Material Girl' singer's current ten year touring contract with promoters Live Nation, signed in 2007 for a reported £80 million.
Whether she appears in Vegas or not, the singer plans to keep touring and recently auditioned for dancers in London to appear in a proposed tour next autumn.
A source said: "It's going to be her biggest, most unexpected tour to date. She is going back to her New York City roots, with a street/hip-hop feel, and wants to make it a physical, dance-heavy set of gigs."
The as-yet unnamed tour - which is part of Madonna's deal with Live Nation - is expected to net the singer in excess of £100 million.
The singer's last world tour - 'Sticky and Sweet' - finished last September and grossed an estimated $400 million in ticket sales.