Home > SR & ED Services SR & ED Services Maximize Your Innovation Tax Credits with SR&ED Compliance Book a Tax Filing Appointment SR&ED Checklist & Deadline SR&ED filing due: 18 months after tax year-end SR&ED Checklist (Documents to Prepare) Maximize Your Innovation Tax Credits with SR&ED Compliance Company & Project Information Legal business name & CRA business numberFiscal year-endDescription of SR&ED projectsProject timelines (start & end dates)Technical challenges and uncertainties facedObjectives and outcomes of the work Financial Documents Payroll records (employees involved in SR&ED)Timesheets or effort allocation recordsContractor invoices related to SR&ED workMaterial and supply invoicesOverhead expense details (if applicable)Government assistance or grants received Supporting & Compliance Documents Prior year SR&ED claims (if any)CRA correspondence or review lettersT661 form (SR&ED Expenditures Claim)Financial statementsCorporate tax return (T2)