BHP Billiton has revealed the true extent of its sweetheart deal with tax authorities in Singapore.

The miner is paying an incredibly low effective tax rate of just 0.002 per cent - or effectively nothing - on the billions of dollars in sales that it directs through its "marketing hub" in the low-tax nation.

BHP Billiton has provided new details on its tax arrangements after recent Senate questioning. Credit:David Mariuz

Between 2006 and 2014 the company booked profits of $US5.7 billion in Singapore, it said in a statement to the Senate inquiry into corporate tax avoidance.

It paid just $US121,000 in tax in Singapore – or $US15,000 a year - it said in its answers to questions on notice to the committee.