A sweep of more than 650 million transactions, from car registrations to gold sales, has delivered the Federal Government an extra $1.3 billion in tax.
The Australian Taxation Office annual report reveals its data-matching program precipitated almost half a million reviews and audits that are likely to bring in more money in the future.
Last year, the ATO collected more than $311 billion in tax, some of which came through targeting people and businesses that had tried to hide some income.
Over the past five years it has picked up $3.1 billion through data-matching, which enables the tax office to check many sources of information against a person's tax return.
The annual report shows wealthy Australians continue to have their tax affairs watched closely by the tax office.
More than 730 audits on people worth more than $30 million raised $1.1 billion in liabilities, with $273 million collected in extra cash during 2012-13.The ATO is also refunding greater amounts. It made 10.1 million refunds worth a total $31.7 billion last financial year.