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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 alternatively you can print them off and send them to us. Read the information below on how to do this :


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

Electronic filing

RWT/NRWT certificate details can be sent to us in an electronic format.  Depending on the size of the file, it can be emailed or sent on a disc.  In order to ensure the security of the file, it must also 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.

Once the file is encrypted, check the size of the file. If you have multiple RWT/NRWT files, you can zip the files first, and then encrypt the zip file.

  • If the file is smaller than 20MB:
  • If the file is larger than 20MB:
    • burn the encrypted file onto a CD or DVD
    • attach the accompanying IR15S/IR67S
    • attach a cover sheet
      (Note: if you are sending files for multiple IRD numbers, please ensure you identify them on the cover sheet.)
      Download this coversheet if you are sending your files on a CD or DVD
      (PDF-1 page-62kb)
    • mail the package to:
      Operations Delivery Upper Hutt
      Inland Revenue
      PO Box 39090
      Wellington Mail Centre
      Lower Hutt 5045

Regardless of how you file, you will receive an email confirmation once your file has been received. If the data fails, you will receive an email requesting that you re-send an amended file.

Once the file has been successfully uploaded, you will receive an email confirmation.

File format

In order for the file to be processed, it must adhere to the specified format.

You can find out more about the specified format in the "Non-resident withholding tax and resident withholding tax specification document".

Read the Non-resident withholding tax and resident withholding tax specification document
(PDF | 15 pages | 334kb)

Encryption requirements

Files sent to us must be encrypted to a PGP level of data encryption.  In order to encrypt your file(s), you will need to 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 ensure that 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 enable you to import our public key and encrypt your files including PGP Desktop and Gpg4win. Gpg4win software is free(as at 29 February 2012) 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, which you should read 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 do not have user instructions defined for those alternatives.

Paper filing

You can complete the forms on-screen by typing content directly into the PDF document. Once you have completed the form it is important that you print it out as you will not be able to save the information you enter into the form.

Once you have completed the forms please mail them to:

Operations Delivery Upper Hutt
Inland Revenue
PO Box 39090
Wellington Mail Centre
Lower Hutt 5045