Hill, 38, pleaded guilty last year to not paying taxes on more than $1.5 million earned from 2005 to 2007. She said she stopped paying taxes after she dropped out of the music business to protect herself and her six children. She was sentenced in July to serve three months.
Prosecutors said at the time that Hill's primary source of income was royalties from the recording and film industries. She also owns and operates four corporations: Creations Music Inc., Boogie Tours Inc., L.H. Productions 2001 Inc. and Studio 22 Inc., according to court papers.
On Friday, Hill released a new song called "Consumerism" on her Tumblr blog.
Her attorney Nathan Hochman says he hasn't had a chance to speak to his client yet.
The singer, who lives in South Orange, N.J., must still serve the next three months under home confinement under terms of her plea agreement.
Hill is a former member of the Fugees and winner of multiple Grammys.
The Associated Press contributed to this report.