The Italian government has since last year been pushing for more digital rather than cash payments to fight widespread tax evasion.
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As well as smaller reimbursements, there will be two 1,500 euro prizes a year for the first 100,000 people who rack up the highest number of digital payments (not the highest value).
The first cashback payout will come on Christmas buying, in February 2021, according to a draft of the rules seen by Italian news agency Ansa
Reimbursements in the scheme will then come at six-monthly intervals: in July 2021, January 2022 and July 2022, it said.
The only other requirements for taking part in the scheme are that people have to be over 18 and have a bank account, though it is not yet clear whether that has to be with an Italian bank.
The government is hoping to increase the use of credit cards, also for small payments, in order to fight tax dodging.
Tax evasion costs the state billions of euros every year, and has long been viewed as both a symptom and a cause of Italy's long-standing economic problems.