A growing number of coalition MPs are getting cold feet over a possible hike in the Goods and Services Tax (GST).  Many are lawmakers on the bubble, from districts that could be turned to the opposition in the next election if the voters are in a mood to take revenge for raising the GST.

Prime Minister Malcolm Turnbull has left the idea of raising the GST from 10 percent to 15 percent on the table for MPs to consider.  But many are cognizant of the 1998 GST election, when 18 seats flipped from Liberal to Labor. 

"I don't think it's anything to be afraid of to talk about what's happening in your electorate and if people have got some concerns about the tax reform there's an opportunity to talk about it," The ABC quoted MP Natasha Briggs.  She holds the Darwin-based seat of Solomon, NT by just over a percent.  "Territorians are concerned because we already have a high cost of living so we want to make sure that any change that occurs in the whole tax system is not detrimental to Territorians," she added, noting that around 20 coalition MPs are leaning against the hike.

Others aren't necessarily opposed to a GST hike of 50 percent, providing there's tax relief in other areas.