Thousands of tradesmen are dodging paying tax by putting Bunnings' ABN on their invoices instead of their own.
The widespread scam is costing taxpayers hundreds of millions of dollars in lost revenue because the Australian Tax Office can't track the money.
Fraud was so rife in some areas than 40 per cent of ABNs quoted in the Northern Territory belonged to the hardware chain.
Thousands of tradesmen are dodging paying tax by putting Bunnings' ABN on their invoices instead of their own
Michael Andrew, head of Treasury's black economy taskforce, told The Australian the scheme was undermining the ABN system so much it was 'not working'.
Tradies copied Bunnings' ABN when they shopped there and put it on invoices with their own company name.
'The result of which (is) you can’t trace then where the money really went,' Mr Andrew said.
Bunnings did not respond to requests for comment,