The person who sets up the trust gets annual payments adding up to the asset's original value, plus a return based on a fixed interest rate set by the InternalRevenue Service.
When making a loan to a family member, one must charge the applicable federal interest rate, or the InternalRevenue Service could subject the lender to gift and income taxes on the "missing" interest payments.
This is the Section 7520 rate (named after the section of the InternalRevenue Code that applies), which is 120% of the current mid-term AFR compounded annually, rounded to the nearest 0.2%.