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RWT certificate filing options

There are two ways you can file your end of year RWT withholding certificate (IR15). You can:

  • file the certificates electronically, or
  • print them off and send them to us.

You can also file your end of year New Zealand NRWT withholding certificate (IR67) in the same way.

Electronic filing

RWT/NRWT certificate details can be emailed to us in an electronic format.  To make sure the file's secure, it must be encrypted.

Filing requirements

The due date for RWT/NRWT certificates is 31 May.

Create your file(s) following the data format specified under file format.

Encrypt your file following the instructions under encryption requirements.

If you have multiple RWT/NRWT files you can zip the files first, then encrypt the zip file.

Attach the file to an email.

Download this coversheet and copy the text into the body of your email
(PDF | 1 page | 55kb)

Copy the wording in the coversheet into the body of the email.

Note: If you're sending files for multiple IRD numbers, make sure you identify them on the cover sheet.

Send to:

If they haven't already been sent to us, you can scan and attach the IR15S/IR67S to your email.

If the data fails, you'll receive an email to send an amended file. Once the file has been successfully uploaded, you'll receive email confirmation.

File format

So we can process the file, it must be in the specified format.

You can find out more about the specified format in the document below.

Read the Non-resident withholding tax and resident withholding tax specification document (PDF | 16 pages | 283kb)

Encryption requirements

Files sent to us must be encrypted to a PGP level of data encryption.  To encrypt your file(s), download our public key and import it into a PGP/GPG application.

You can download the public key by clicking on the link below. You will need to right click to 'save as' and make sure the file is saved with the extension '.asc'

Download the public key


The public key above will encrypt your file so there is no need to send us an additional password.

There are a number of software packages which will let you import our public key and encrypt your files including PGP Desktop and Gpg4win. Gpg4win software is free and runs on Windows XP, Vista and 7. Both 32 and 64bit systems are supported.

Find out more about encrypting IRD RWT/NRWT certificate files with Gpg4win


Gpg4win is subject to a license agreement. You should read this before deciding whether to download Gpg4win.

Download the full version of Gpg4win
(PDF | 7 pages | 503kb)

There are other GPG and PGP applications available for Windows, Mac and Linux which can be used for file encryption. However, we don't have user instructions defined for those alternatives.

Paper filing

You can download the RWT withholding certificate IR15 and send it to us.