The Inland Revenue has started sending the first batch of more than 2.5 million automated tax statements that tell people whether they have a tax refund or a bill to pay.
Deputy Commissioner Sharon Thompson said the refunds will be going out in batches rather than all at the same time and warned people to look out for scams.
"We'll be contacting customers to let them know about their assessments by email or through a letter in the post.
"The main thing to remember is that if you have any doubt about whether that communication is genuine, then type ird.govt.nz into your browser and access our secure online services portal myIR from there. If you don't have a myIR account, then it's a good idea to register for one, as that's where all your information is securely displayed.
"There could be scammers out there trying to direct you to other websites so we encourage everyone to be vigilant. If you make your own way to ird.govt.nz, you can be sure you're in the right place."