Another missing Oklahoma tax return. Specifically, a non-resident (511-NR) tax return. The Federal and Kansas returns were e-filed on January 24th but the Oklahoma return had to be mailed. That is because the Oklahoma Tax Commission has never gotten around to developing e-file for non-resident returns. And from the information I have heard today, it doesn't look like they are planning to add this service in the next few years. Add this to unbelievably slow processing of paper returns and their ability to lose returns, you can imaging my frustration today.