Born in Perth, Western Australia, Toby attended Perth's Scotch College and briefly studied law at the University of Western Australia. He graduated from the acting course at National Institute of Dramatic Art with a degree in Performing Arts (Acting) in 1999.
His Sydney Theatre Company credits include The School for Scandal directed by Judy Davis, the premiere and national tour of David Williamson's The Great Man directed by Robyn Nevin, and leading roles in George Bernard Shaw's Major Barbara, Andrew Upton's Hanging Man, Tony McNamara's The Great, Brendan Cowell's Self Esteem, Nina Raine’s Rabbit and Tom Stoppard's Travesties. Several of these productions toured to Melbourne and other Australian capital cities.
For Griffin Theatre Company, he played the central role of Luke Boyce in Louis Nowra's The Boyce Trilogy – The Woman with Dog's Eyes (2004), The Marvellous Boy (2005) and The Emperor of Sydney (2006), all directed by David Berthold.
For Company B he played the title role in Brendan Cowell's Ruben Guthrie (2008 and 2009). He performed the role of Coleman in The Lonesome West at Belvoir St Theatre in 2009.
He also appeared in the premiere of Brendan Cowell's Men for Rogue Star Productions.
In 2000, he directed a production of Howard Korder's A Boy's Life at the Bondi Pavilion. In 2008 he directed Neil LaBute's This Is How It Goes.
In 2010, Toby played the eponymous character Hamlet in the enormously successful La Boite Theatre production in Brisbane, directed by David Berthold and played as Benedick in Shakespeare's Much Ado About Nothing.
His many television credits include McLeod's Daughters, The Heartbreak Tour, The Cooks, White Collar Blue, Water Rats, Fat Cow Motel (ABC), Home and Away, Temptation, and the Steven Spielberg/Tom Hanks produced miniseries The Pacific.
He also be appeared in the third installment of the Underbelly Files series of telemovies, titled 'The Man Who Got Away', portraying notorious drug smuggler and organised crime figurehead David McMillan.
In 2012, he teamed up with Angus Sampson in Season 1 of the Australian word game Randling, hosted by Andrew Denton on ABC1.
Toby’s film credits include The Rage in Placid Lake, Somersault, Agoraphobia in the Desert of the Real, The Heist, My Last Ten Hours with You, Emulsion, Solo, Heaven, Right Here Right Now, for which he was also writer and co-executive producer, and Three Blind Mice, a film which has played at numerous international film festivals and won awards including the 11th FIPRESCI International Critics Award at the London Film Festival presented to the Best Film in the World Cinema section. His latest film is Griff the Invisible.
Toby is also an awarding-winning playwright. After a solid grounding in writing revue and stand-up comedy at university in Perth, Schmitz wrote his first play, dreamalittledreamalittle, while studying acting at NIDA. It was presented as a director's project there in 1998 and was later restaged at Belvoir St Theatre. In 2002, Schmitz won Sydney Theatre Company's Patrick White Playwrights' Award with his play Lucky, which was later produced by the Australian Theatre for Young People. Chicks Will Dig You was performed as part of Company B's 2003 B Sharp season. It won the Australian National Playwrights’ Centre/New Dramatists Award in 2004, and was shortlisted for the 2003 Philip Parsons Young Playwrights Award. In 2007, he wrote and directed Capture the Flag for Tamarama Rock Surfers. His other plays include This Blasted Earth, Pan, Cunt Pi, and Grazing the Phosphorus, commissioned by the National Institute of Dramatic Art. His play, The Best Hotel in the Dam opened for Tamarama Rock Surfers 2009.