New analysis showing that families in Coalition-held electorates do far better out of the budget than those represented by Labor members adds a political dimension to what a welter of analysis has already shown – the burden of the government's austerity drive hits poorer families hardest.

The study released on Friday by the respected National Centre for Social and Economic Modelling is, on one level, unsurprising – electorates with lower income levels tend to elect Labor MPs.

Families living in seats won by the Coalition are doing better under the budget, analysis has revealed. Credit:Alex Ellinghausen

But the immensity of the divide between Coalition and Labor seats is astonishing. By 2017-18, when the changes from the budget take full effect but the temporary deficit levy ends, 20 of the 22 seats where families lose the most money are held by the opposition.

In a politically damaging finding, four of the five electorates that do best are held by senior cabinet members, including the Prime Minister and Treasurer. Of the 22 that suffer the lowest falls in income, only six are represented by the ALP.