Eighty of the 100 Australian postcodes that benefit most from negative gearing are represented by federal Coalition MPs.

Prime Minister Malcolm Turnbull's neighbours in the 2027 postcode - covering the exclusive harbourside suburbs of Point Piper and Darling Point - benefit more than anyone else in the county, claiming the highest average net rental loss.

Malcolm Turnbull plans to issue long-dated bonds to lock in historically low interest rates to part-fund projects. Credit:Alex Ellinghausen

New research by the Parliamentary Library has found that of the 6071 people in Mr Turnbull's postcode who submitted a tax return in 2014, 592 claimed the tax deduction to the tune of almost $18 million - or $30,278 each.

That works out at about $582 a week.