Latest version of t661 2026

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The document is a form for claiming Scientific Research and Experimental Development (SR&ED) expenditures in Canada. It provides guidelines for submitting technical information about SR&ED projects, calculating eligible expenditures, and claiming investment tax credits (ITC). The form includes sections for general information, project details, expenditure calculations, and necessary certifications. It emphasizes the importance of filing within specific deadlines and retaining supporting documents for potential reviews.

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Click ‘Get Form’ to open the latest version of t661 in the editor.
In Part 1, enter your name, business number, and tax year. Ensure all contact information is accurate for smooth communication.
Proceed to Part 2 for project information. Fill out a separate section for each project claimed this year, including project title and dates.
In Section B, describe the scientific uncertainties you aimed to overcome and summarize the work performed during the tax year.
For Part 3, select your method for calculating SR&ED expenditures. Input detailed financial data as required in the respective fields.
Complete Parts 4 through 10 by providing necessary certifications and ensuring all claims are supported by documentation.

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Versions	Form popularity	Fillable & printable
2020	4.8 Satisfied (105 Votes)
2015	4.4 Satisfied (165 Votes)
2013	4 Satisfied (51 Votes)
2012	4.4 Satisfied (96 Votes)
2011	4.3 Satisfied (62 Votes)

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What is the T661 form?

Use the T661 expenditures claim form To report your expenditures, you must first calculate how much you spent on an SRED project during the tax year. Use Form T661 to calculate your: Allowable expenditures. Pool of deductible expenditures. Qualified SRED expenditures.

What is eligible for SRED?

Determining if a project is eligible for a SRED tax credit means showing a systematic investigation or search thats carried out in a field of science or technology by means of experiment or analysis and that the work performed involves basic research, applied research or experimental development.