(1) Companies are increasingly investing in solar tax equity deals to take advantage of tax incentives, however some project developers structure deals in ways that put the tax incentives at risk. (2) Two common mistakes are "leasing" systems to non-profits, which makes the systems ineligible for tax credits, and including fixed buyout prices below fair market value in PPAs, which could lead the IRS to treat the PPA as a sale. (3) To protect tax incentives, PPAs with non-profits should meet IRS criteria to be treated as a service agreement rather than a lease, and buyout prices should be set as the greater of fair market value or a fixed price.