A week after the Treasurer, Wayne Swan, handed down his "cash splash for families" budget, Labor has been delivered a boost in the polls.

According to Newspoll, the government's latest blueprint of cash handouts and tax breaks for lower-income households has resulted in a 3 per cent bump in its primary vote, taking its support among voters back to 30 for the first time in two months.

Cash splash for families ... Treasurer Wayne Swan. Credit:Alex Ellinghausen

The Tony Abbott-led Coalition lost 6 percentage points in its primary vote, taking it to 45 per cent.

The two-party-preferred numbers show support for the Coalition is nevertheless at a election-thumping 55 per cent, compared with Labor's 45 per cent.