Former prime minister Malcolm Turnbull used his MP allowance to fund "whole of government" social media advertising and digital promotions worth up to $30,000 per week last year.

Mr Turnbull charged taxpayers $246,000 for expenses billed as "e-materials" from May last year to June this year, about 15 times what the average MP spent. Soon-to-be Prime Minister Scott Morrison spent $11,354 and Bill Shorten $2,563.

In the 2017-18 financial year MPs were allowed to spend up to $134,099.34 on office expenses, including targeted promotion of government policy on social media platforms such as Facebook, Twitter or YouTube.

In addition they were entitled to spend $1 for every enrolled voter in their electorate, as at the end of 31 March in the previous financial year. The most recently published headcount states there were just over 102,000 enrolled voters in the Wentworth electorate in 2016.