I always have signed engagement letters - every year, every client. And my questions are on the questionnaire, not the organizer as full blown. Similar to Sara, I send select organizer parts to those who are self-employed or have rental property so they can see the prior year categories and amounts. While those pages are seldom completed, they serve as reminders. Often I use them to fill in the totals from original documents provided and, of course, the multiple emails with answers that have to be consolidated in one line. I think I am the only preparer that has clients like that, right? /s