Can I close my property tax account through My ServiceOttawa?

You are not able to close your tax account through My ServiceOttawa. Revenue branch must receive legal documentation to update a property tax account. The lawyers involved with the sale are responsible for adjusting the property taxes between purchaser and vendor. The lawyers will also notify the City of Ottawa in regard to any ownership changes. See How do I remove a property tax account from My ServiceOttawa?(link is external)