According to a source, Swift will play the same role Chris Martin held last year, advising contestants on all teams.
"Taylor was an absolute pleasure to work with," an insider said of Swift's time at The Voice. "She had great feedback for all the contestants. She made for an amazing mentor."
Swift joins previously announced advisers Stevie Wonder, who's working with Adam Levine, Gavin Rossdale, who's working with his wife and new coach Gwen Stefani, Little Big Town, who's working with Blake Shelton, and Alicia Keys, who's working with new coach Pharrell.
The Voice premieres Monday, Sept. 22 at 8/7c on NBC.
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