Australian Taxation Office assistant commissioner Karen Foat said the festive season also doubles up as a prime time for scammers.
The ATO is warning the community about scammers taking advantage of tax payment deadlines to scam unsuspecting victims.
Around $2 million was lost from November 2018 to January this year - the biggest ever peak in money being lost to scammers pretending to be from the ATO.
The ATO have recently spotted scammers using the cardless cash feature offered by many banks. Through this feature, victims are sent codes to withdraw cash from an ATM, which they then read out to the scammer.
"One Sydneysider was duped out of $500 through this tactic. After a client alerted him that he was scammed, he reported the incident to us," Ms Foat said.
"We see these ATO impersonation scams by phone, email, SMS and even through message apps such as WhatsApp.
"In October, we also saw a spike in email and SMS scams, often asking people to update their personal details. These scams usually contain links to fake online services to get personal information that enables scammers to steal your identity.
"So far this year, 622 people paid over $2.1 million to scammers impersonating the ATO."
Ms Foat said she was "particularly concerned" about the sophistication the scammers keep showing.
"They are getting better at impersonating large organisations and ramp up in periods where people expect to hear from us, to make their threats appear more legitimate," she said.
"While some taxpayers will have tax payments due from November, the ATO will always let you know how much you owe and the due date when we send your notice of assessment.
"If you're unsure, you can check if you have a legitimate debt anytime by logging into your myGov account, or by contacting us or your tax agent.
"Our work to inform the community has paid off. We are seeing an increase in the number of people reporting scams and a decrease in the number of people handing over money to scammers. But any money going to scammers is too much."
Remember, the ATO will never:
- Use aggressive or rude behaviour, or threaten you with immediate arrest, jail or deportation
- Project our number onto your caller ID - so people can be sure that if there's a number on their caller ID, it's not the ATO calling
- Request payment of a debt via cardless cash, iTunes or Google Play cards, pre-paid Visa cards, cryptocurrency, or direct credit to a personal bank account
- Send an email or SMS requesting you click on a hyperlink to log on to government services