The 2012–13 season saw Tozer start the season well after results went well for the first three matches. He provided double assist, losing 3–2 against Plymouth Argyle on 1 September 2012. Following his grandfather's death, Tozer was given a compassionate leave by Aidy Boothroyd. However, he played a match in a 0–0 draw against Chesterfield. Tozer then provided another double assist in another match, winning 3–0 win against Morecambe on 20 November 2012. In March, he was awarded Northampton Player of the Month for February. Tozer went on to make 46 appearances for the club, making him ever present player throughout the season. He played all three matches in the play-offs and started as a right-back in the play-off final, in a 3–0 defeat to Bradford City. Despite unsuccessful attempt to get promoted to League One, Tozer was offered a new contract and signed a two-year contract on 19 June 2013.