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http://www.cra-arc.gc.ca/tax/individuals/topics/income-tax/changeaddress-e.html
How to change your address
When you move, please send us your new address as soon as possible:
By Internet
Note: "Address Changes Online" will come under "My Account" in February 2005.
You can change your address, or check the address and phone number we have on file for you, using our Address Changes Online service.
By mail or fax
Send your request by mail or by fax to your tax centre. Be sure to include your:
signature
social insurance number
new address
the effective date
By phone
Call our Individual Income Tax Enquiries telephone service at 1-800-959-8281
Why is it important?
When you tell us your new address in advance:
you can avoid any disruption to benefit payments you may be receiving, such as the GST/HST credit, the Canada Child Tax Benefit, and benefits under any related provincial and territorial programs.
next year we can mail your tax package to the correct address.