EY projects that Sphere National Harbor will generate $43.1 million in annual tax revenue for the county. “My team did an amazing job of putting together a deal that protected the people of Prince George’s County but also incentivized a major company to move such an iconic venue here to Prince George’s County,” County Executive Aisha Braveboy said in January. How TIF Financing WorksPrince George’s County isn’t drawing $200 million out of its general funds to help Sphere Entertainment construct Sphere National Harbor. Instead, the county is issuing bonds to the company that will be repaid with future tax revenue generated by Sphere National Harbor. Sphere National Harbor’s big brother, Sphere Las Vegas, had a rough start, as the COVID pandemic ballooned construction costs to $2.3 billion.