Inland Revenue (IRD) warns Kiwis not to become a victim of recent fraud via email, which is said to be "very widespread".
Email appeared during the weekend, offering customers "tax refunds".
The IRD said it received more than 900 reports of "convincing" fraud.
"It looks like the real thing, but there are some misunderstandings that people can use to say it's a scam," IRD spokeswoman Sharon Thompson said.
She said in this particular scam, no personalized greeting to the email, and the non-existent IRD number is also on the list.
Thompson said that this fraud includes both the amount in dollars for a fake refund, which IRD does not do.
IRD is currently in the process of e-mail removal.
Anyone who received email is advised to forward it to email@example.com.
See the video above to learn how to avoid fraud on the internet.