Follow the steps to effectively complete the Canada T661 form online.

1. Click ‘Get Form’ button to obtain the form and access it in the online editor.
2. In Part 1, enter the general information such as your name, business number, tax year, and contact details. Ensure to provide accurate information as it sets the foundation for your claim.
3. Proceed to Part 2 where you will provide detailed project information. Complete a separate section for each project you're claiming in the tax year, including project title, dates, and descriptions of technological uncertainties.
4. In Section B of Part 2, describe the scientific or technological work performed to overcome uncertainties. Be concise yet comprehensive in your description, adhering to the maximum word limits provided.
5. Part 3 requires you to calculate your SR&ED expenditures. Choose between the proxy method or the traditional method and fill out the relevant fields according to your selection.
6. Complete Part 4, which focuses on calculating qualified expenditures for investment tax credits (ITC). Ensure all relevant amounts are accurately totaled and deducted as necessary.
7. Continue to Part 5 only if you selected the proxy method. This section calculates your prescribed proxy amount, which represents indirect costs you claim.
8. In Part 6, document the costs associated with each claimed project. Categorize expenses into salaries, materials, and contract costs.
9. Check Part 8 for a claim checklist. Verify that all sections are completed accurately and that you have supporting documentation ready for your claim.
10. Finally, complete Part 9 with the information of any claim preparer involved, and then certify the form in Part 10 before submitting it online.

Start completing your Canada T661 form online today to take advantage of your SR&ED claims!