I bought some rentals from my parents when retired, we partnered with private equity group and own some storage units and my wife bought/worked her way into a tax escrow research company partnership for us. I do maintenance, accounts receivable/payable and basic accounting and payroll. I currently do not take a paycheck, but laws allow me to fund a 401k as an employee through the business. I don't believe the fund will care, but once I start taking income, I'm sure they're going to want to know where it's coming from.