Joe Hockey reportedly billed taxpayers more than $13,000 for a dinner at an exclusive Sydney restaurant just weeks after handing down a Budget judged to be one of the most unfair in modern Australian history.

The then-treasurer and trade minister Andrew Robb were hosting unnamed overseas politicians ahead of the 2014 G20 meeting in Brisbane, The Courier-Mail reports.

Both Liberal MPs' staffers attended the 22-person dinner at North Sydney's Aqua Dining, which costed $620 a head.

The bill also included $500 for flowers and $1100 for "audio visual services".

As well as stunning Harbour views, the group enjoyed confit South Australian calamari, quail eggs, onion and porcini soup, salmon, lamb, risotto, and sides of cocktail potatoes, beans and sugar snaps.

For dessert the guests of the Australian taxpayer dined on pear, crème fraîche and star anise granita, warm chocolate cake, and cheese platters with port and Frangelico.

The decadent dinner was held just weeks after the controversial 2014 budget was handed down and Mr Hockey urged Australians to be a nation of lifters, not leaners.

The latest expenses revelation comes after it was revealed Mr Hockey slugged taxpayers $1200 for babysitting while serving as US ambassador in Washington.