Yes. The success of a business project is unrelated to its eligibility for SR&ED. SR&ED claims are often subsets of business projects. SR&ED can be claimed as long as technological uncertainty, technological advancement, and systematic investigation can be shown, regardless of whether or not the business objectives were met.
No. Unless the CRA paid out the incorrect amount due to a clerical error, previously assessed claims will not be reassessed.
You have 18 months from the end of your fiscal year to file for SR&ED. You can amend an existing tax filing any time prior to the end of the 18-month period.
Claiming IRAP does not preclude your company from benefiting from the SR&ED program. Generally speaking, IRAP payments will be deducted from SR&ED returns.
The reviews for the SR&ED program are separate from those of the CRA audits. The objective of the CRA tax auditor is to recover tax dollars from taxpayers. The objective of the SR&ED program differs from this, in that its purpose is to encourage technical innovation in Canada.