I'm glad I have no clients with rentals. However, as I age, my clients age, and I'm thinking about those personal residences, how to find out how they're titled, what will be the adjusted cost basis if a surviving spouse sells. Or, if one of my clients is a kid/heir to parent's personal residence, and sells it. Or rents it out for a couple years before selling!
Had a long-time client who inherited shares of her mother's investments that included 3 rental real estate partnerships, as well as other complex investments. I told her I would no longer prepare her returns. (Divesting myself of CA clients, so that gave me a reason to tell her to find someone local to her sooner rather than later.) Client had moved from CT where I am to CA to care for her mom; went from a W-2 to a 1099-R to inheriting 1/3 of apartment building partnerships and other complex investments with no depreciation tables and no CA K-1s and her HRB-employee sister and her TurboTax sister telling her how to report things. She would never accept my price increase to account for my time and research and listening to her arguments from her siblings. She wanted me to prepare her taxes one more year before she found a local tax preparer. I refused to spend my time setting up her new situations now for her new preparer next year, and told her that THIS is the year for her to begin with a new preparer. Hated to lose her, but knew she wouldn't be happy with the fee I needed to charge for my time -- especially since she's comparing my fee to her siblings' TT price and HRB-employee probably free returns.