One thing I missed saying, was that I print the returns to a pdf first, then send the pdf file to my printer with it set on two sided printing. That way I never have a problem (I shouldn't say never! Isn't that asking for trouble?) Since I send the invoice and letter and a summary page with a pdf copy of the return all separate to the clients in DocuSign after it's been filed, I'm printing to a pdf anyway so it doesn't take a lot of extra time or effort. I hope this all helps to simplify your tax season!
