York was born on December 17, 1989 and raised in Nashville, Tennessee. His father is Peter York, a music executive at Sparrow Records who is also a guitarist, and taught the instrument to both Taylor and his brother Justin.
York had been in a band with the Farro brothers (Josh Farro and Zac Farro) before the two met Hayley Williams, and took part in writing songs such as "Conspiracy" from their debut album, All We Know is Falling. York had played with Paramore as a touring member for two years (2007–2009) eventually becoming an official member in 2009.
Taylor had done backup vocals when he was younger for All We Know is Falling. He joined Paramore after the departure of Hunter Lamb in 2007, initially as their touring rhythm guitarist. In the liner notes for the group's second album, Riot!, Hayley Williams, Josh Farro, Zac Farro included him on their list of 'thank-you's.
After the release of Riot!, Paramore released a live album, The Final Riot. York was credited as a member of the band in the liner notes and was later officially acknowledged by Paramore as an official member. He has taken part in the writing and recording of their albums since.