The practice of global corporations loading up subsidiaries with debt and then claiming relief from the Australian tax man on the interest paid gives an "unfair competitive advantage" over local rivals, Treasury said in 2013.

"When some taxpayers avoid or minimise their tax in a sustained way, the tax burden eventually falls more heavily on other taxpayers," a Treasury issues paper found at the time.

The Gillard government announced the abolition of deductions under section 25-90 of the Income Tax Assessment Act 1997 as part of a package to combat tax minimisation by global corporations, at a projected benefit to the taxpayer of $600 million.

In November last year, Mr Hockey and the then Assistant Treasurer, Arthur Sinodinos, announced they would not legislate Labor's package, saying it would impose "unreasonable compliance costs on Australian companies" with subsidiaries offshore.

The current loophole favours the largest companies operating in Australia. Mining industry sources suggested they include Swiss-based Glencore and Anglo American.

Instead, Mr Hockey – who has trumpeted a global tax crackdown on multinationals through the G20 process – and Mr Sinodinos pledged in November to "introduce a targeted anti‑avoidance provision after detailed consultation with stakeholders".

But in Monday's Mid-Year Economic and Fiscal Outlook, a single line on page 117 revealed: "The government will not proceed with a targeted anti-avoidance provision to address certain conduit arrangements involving foreign multinational enterprises, first announced in the 2013-14 MYEFO."

While companies like IKEA and Apple have been in the news for "offshoring" billions of dollars made in Australia, tax experts told Fairfax Media it was Australia-based global players that will benefit the most from the government's backdown.

Companies with significant operations overseas get a "double bonus" under the existing law, introduced by the Howard government in 2001, because dividends from their international subsidiaries are tax exempt yet the interest on borrowings used to grow overseas operations is tax deductible.

One of the loudest opponents of the plan to abolish deductions was major Liberal Party donor Paul Ramsay, now deceased, who complained it would make it more expensive for his company Ramsay Health Care to use debt to invest in Europe.

On Tuesday, shadow assistant treasurer Andrew Leigh accused Mr Hockey of "sneaking in another giveaway for multinational companies" despite presiding over a near doubling of the deficit in 2014/15.

"Yet again the Treasurer has shown that he is happy to let big companies off the hook while hacking into foreign aid, schools, hospitals and pensions," Mr Leigh said.

Mr Hockey's office referred questions to Finance Minister Mathias Cormann, who took on Mr Sinodinos' portfolio after he stood aside pending upcoming findings by the NSW Independent Commission Against Corruption.

In a statement, Mr Cormann insisted "No promise was broken" by the announcement in MYEFO on Monday

"Following consultation with stakeholders and the Australian Taxation Office, it became very clear that a targeted anti-avoidance provision would be ineffective," he said.

"It is important to remember that the proposed changes to section 25‑90 were never advocated in isolation, but were part of a broader package to address profit shifting by excessive allocation of debt to the Australian operations of multinationals.

"The government has implemented key elements of this package, including tightening the thin capitalisation safe harbour limits and ensuring the foreign non-portfolio dividend exemption for Australian companies only applies to returns on equity.

"As a result of these changes, all debt used to fund Australian operations, including debt used to fund offshore investments which give rise to 25-90 deductions, is now subject to the binding constraint of the thin capitalisation rules, which provide protection against abuse of section 25‑90 deductions."

John Passant, an outspoken tax expert from the Australian National University, recently wrote about the government's decision not to abolish section 25-90 deductions.

"It is unfortunate in the extreme that the Treasurer and Treasury have listened to a group of rent seekers being unjustly rewarded by not repealing section 25-90. But since this is a government of the 1% that is not surprising and we can conclude in fact that Hockey's bluster about addressing tax avoidance by his rich mates is just that – complete and utter bluster," he wrote.

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