Prime Minister Malcolm Turnbull's hopes of securing a boost in the polls after switching the Coalition on to a more popular footing in this week's budget, have so far failed to materialise.

The first serious poll since the big-spending budget reveals the Coalition still trails behind the Labor opposition by a solid six-point margin on 47 per cent to 53 after preferences.

More than half of all voters expect to be worse off, with 51.6 saying they would be worse off.

Only 10.8 per cent say they would be better off, and 37.6 per cent say they will be about the same.