Upon demobilisation, Askin returned to work at the Rural Bank, managing its travel department. However, his interest in politics arose again when he assisted his former commanding officer, Lieutenant Colonel Robson, in retaining his seat of Vaucluse at the 1947 state election for the newly formed Liberal Party, which Askin then joined. Rapidly rising through the party ranks, Askin soon became President of the Liberals' Manly branch and supported Bill Wentworth's successful bid for the new seat of Mackellar at the 1949 election.