Early voting numbers in the second and binding flag referendum are tracking higher than the first vote, with almost one million votes already.
As of March 10, more than 973,041 forms had been received by the Electoral Commission since voting opened on March 3.
At the same point in the first referendum, which whittled down five alternatives to the blue and black silver fern, 438,733 voting forms had been received.
The voting period for the second vote closes on March 24, though the commission recommends people post their forms by March 21 to make sure their vote is received on time.
If voters haven't received their voting packs by today, Chief Electoral Officer Robert Peden says they should get in touch with the commission to organise another voting form to be sent.
"You can also request a replacement paper if you have spoiled, destroyed or lost your original," he says.
Replacement papers can only be sent out until March 21, though only those who were enrolled by March 2 this year are eligible to have their say on the flag.
Referendum 2 voting numbers: