The Reserve Bank confirmed the ban in March, giving businesses a six-month window to prepare. The reforms are estimated to save consumers $1.6 billion annually.
Small business owners have expressed concern that the sweeping changes will leave them financially worse off and force them to increase product and menu prices. Business lobby groups say many smaller shops are still in the dark about how the rules work, describing some as "quite ill-prepared".
The changes have already rippled through the payments ecosystem. Major banks have wound back the generosity of credit card sign-on bonuses and rewards points earning rates following a lower cap on interchange fees, the merchant fees that traditionally funded rewards perks.
The Australian Taxation Office has also removed credit cards as a payment method, saying the move would not affect most taxpayers. Only 2.3 per cent of tax payments in the 2024 financial year were made by credit card, with the majority from high net worth individuals or major organisations.
"As a government agency, the ATO has decided it would not be appropriate for the cost of credit card merchant fees to be transferred to the community," it said in a statement.