The ATO has reminded taxpayers who receive any foreign income from investments, family members or working overseas to make sure they report it this tax time.
New international data-sharing agreements allow the ATO to track money across borders and identify individuals who are not meeting their reporting obligations.
"This year, the ATO has received records relating to more than 1.6 million offshore accounts holding over $100 billion, and is now using data-matching and sophisticated analytics to identify foreign income that has not been reported", Assistant Commissioner Karen Foat has said.
Under the new Common Reporting Standard (CRS), the ATO has shared data on financial account information of foreign tax residents with over 65 foreign tax jurisdictions across the globe. This includes information on account holders, balances, interest and dividend payments, proceeds from the sale of assets and other income.
"Australians that deliberately move cash overseas in an attempt to hide it should be concerned. Hiding your assets and income offshore is pointless. 'Tax havens' are becoming a less effective model as international agreements improve transparency. You can no longer hide money behind borders."
The ATO also states that apart from a small number of individuals deliberately engaging in tax avoidance, it is concerned about a large number who are unsure of how to meet their obligations.
"If you're an Australian resident for tax purposes, you are taxed on your worldwide income, so you must declare all of your foreign income no matter how small the amount may be. This may include income from offshore investments, employment, pensions, business and consulting, or capital gains on overseas assets", Ms Foat said.