I'm sitting here doing what will likely be the final invoice for most of my customers today, and was just wondering if others do anything different when sending the final bill for the season? I put a hand written note in each one, thanking them for the business, and tell them I'll plan on mowing again next spring, starting around April 1. I didn't do this the first few years I mowed, and it was always a stressful time for me the next spring, contacting each customer and hoping I'd have the account for another year. This way, the ball is in their court, so if they don't want me to mow for some reason, it is up to them to contact me and let me know. Otherwise, when the grass needs cut, I just start mowing.