T661 2026

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  1. Click 'Get Form' to open the t661 in the editor.
  2. In Part 1, enter your name, business number, and tax year. Ensure all contact information is accurate for smooth communication.
  3. Proceed to Part 2. For each project claimed, provide a title, start date, and completion date. Describe the scientific uncertainties you aimed to overcome.
  4. In Section B of Part 2, summarize the work performed during the tax year and any advancements achieved. Be concise yet thorough.
  5. Move to Part 3 to select your method for calculating SR&ED expenditures. Fill in the relevant financial details as instructed.
  6. Complete Parts 4 through 10 by providing necessary calculations and certifications. Review all entries for accuracy before submission.

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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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