The ads, running in key by-election seats, say the Prime Minister himself would benefit from the proposed company-tax cuts.
Meanwhile, a new poll shows most Australian voters continue to back Mr Turnbull over Mr Shorten as the preferred prime minister.
The latest Fairfax/Ipsos poll pegs Mr Turnbull at 51 per cent against 33 per cent for the Opposition Leader.
But the Coalition continues to lag behind Labor on a two-party-preferred basis, at 47 per cent to 53 per cent.
The poll was held soon after the Government's $144 billion personal income-tax cuts plan finally passed federal parliament last week.