The state body has warned customers to be aware of fraudulent emails purporting to come from them which seek personal information from taxpayers in connection with a tax refund or seeking credit/debit card details.
"These emails did not issue from Revenue," Revenue have warned.
"The Revenue Commissioners never send emails requiring customers to send personal information via email or pop-up windows."
A spokeswoman has said the messages contain links to various 'Phishing' websites which seek to acquire customer details.
"These emails did not issue from Revenue. They in no way involve our systems and security," the spokesperson said.
"These 'phishing' scams have become common of late with banks and other organisations like ourselves being used to attempt to defraud innocent people."
Revenue are advising people to simply delete the emails and report the sender.
"Anyone who receives an email purporting to be from Revenue and suspects it to be fraudulent or a scam should simply delete it. Anyone who is actually awaiting a tax refund should contact their local Revenue Office to check its status."
Also, anyone who provided personal information in response to these fraudulent emails should contact their bank or credit card company immediately.
People can visit Revenue's security page here