Upon the resumption of first-class cricket in 1945–46, Toshack made his debut for New South Wales against Queensland as an opening bowler aged almost 31, and was quickly among the wickets. He took four 4/69 in his first innings as his team took a 128-run lead, but he managed only 0/87 from 20 overs in the second innings as New South Wales fell to a four-wicket loss, failing to defend a target of 270. His first wicket was that of Geoff Cook. Toshack's most successful match of the season came in the following fixture, against South Australia. Taking 4/30 and 4/78 as New South Wales won by an innings. He then took 2/36 and 3/54 in an innings victory over the Australian Services.