According to a list compiled by foreign governments, of the 32 international contractors employed to help run the games, only two have been paid in full.
The total debt amounts to more than $80m (£50m) and some of the companies are now in danger of folding.
Their experience seems to support a recent World Bank survey which found that India was one of the hardest places in the world in which to do business, coming a lowly 134th out of 183 countries. Full story