In 2004, Banas joined the cast of McLeod's Daughters as the character Kate Manfredi, the best friend of Jodi Fountain McLeod. She played Kate from episodes 88 to 170, when she took a short break to later return in episode 177. It was announced in 2007 that she would leave McLeod's Daughters in its final season. Banas' last episode was aired in early December 2008.
From 11 November 2008, Banas appeared in the role of Libby Kennedy on the Australian soap opera Neighbours for a five-week period after Kym Valentine was forced to take a temporary break due to illness.
In 2009, Banas filled in for Fox FM's Jo Stanley on The Matt and Jo Show while Stanley was on maternity leave. That same year saw her star in the national tour of the Broadway musical, Avenue Q, playing the roles of "Kate Monster" and "Lucy the Slut". Banas is currently one of three celebrity faces for Proactiv Solution in Australia and New Zealand.