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T661    Claim for Scientific Research and Experimental Development (SR&ED;) Carried Out in Canada

Form T661, Claim for Scientific Research and Experimental Development (SR&ED) Carried Out in Canada, has been revised. The new version, Form T661 (06), is effective as of May 9, 2006.

The Canada Revenue Agency will continue to accept the previous version of Form T661 (04) until September 30, 2006.

What's New - Changes to Form T661

You can view this form in:

PDF t661-06e.pdf (162 KB) (effective as of May 9, 2006)
PDF t661-04e.pdf (53 KB) (effective February 9, 2005)

Last update: 2006-05-09
Available in print: 2006-06-15

Previous-year versions are also available.

Related documents:
T4088 Claiming Scientific Research and Experimental Development - Guide to Form T661
T1263 Schedule A — Additional — Third-party payment for SR&ED;

For more information, see our help file. You can also order printed copies and multiple formats of this form, such as large print, Braille, audio, and E-text (accessible electronic text).