The treasurers of NSW and South Australia will lead a working group to examine changes to the taxing of goods bought online.
Mike Baird and Jack Snelling were appointed at a meeting between federal Treasurer Wayne Swan and his state counterparts in Canberra on Monday to review the low-value threshold.
The treasurers aim to have recommendations by the end of 2013.
The federal government earlier in December acknowledged the $1000 threshold at which GST is collected on goods and services purchased from abroad is high by international standards, but rejected calls for an immediate reduction.
However the states will now provide a comprehensive analysis of the impact of changes.
Queensland Treasurer Tim Nicholls told AAP after the two-and-a-half-hour meeting that the group had examined the GST review report by Nick Greiner and John Brumby.
The treasurers had agreed to provide a response to the Council of Australian Governments meeting early next year.
"We had discussions on a number of recommendations," Mr Nicholl said.