For online donations - CanadaHelps automatically issues a tax receipt.
For donations by cash or cheque - CCSAC, a registered charity, will issue charitable receipts for any donation of $20 or more.  Upon request, we will issue a charitable receipt for lesser amounts.  We will need your sponsor’s email or mailing address in order to send them a tax receipt, so make sure they fill in the Pledge Form.
A reminder that it is easiest to collect donations immediately from your sponsors when you sign them up, rather than trying to chase them down again after the walk.