You file IRS Form 8996 with your return for the year of QOF formation/certification. Even though the form is not terribly complex I recommend that you get assistance from a CPA or attorney to ensure you pick the proper certification date, which must be on or before the date the QOF accepts funds from an investor rolling qualified gains. The cost of completing the form should be relatively nominal - say, an hour of time. However, the attorney or CPA will likely need some time to fully evaluate your specific project. Formation of your QOF and QOZB should be approximately the same as forming any other entity. Monitoring and semi-annual testing of the entities can range from simple to complex, so costs are tough to estimate.