I think I am going to extend their return and pay the tax owed via EFT and file them once the form(s) have all been approved. I have informed the clients that their tax due will be withdrawn March 2nd (farm returns) anyway so it won't be an inconvenience and shouldn't come as a surprise to them. In the meantime I will inform the farm clients with a refund of the situation so they're not wondering why their return has not been filed yet.