NBCUniversal also bought exclusive television rights to the eight Harry Potter films this summer in a deal valued at as much as $250 million. Ms. Rowling presumably received a large piece of that, at least $125 million. That replaced a deal with Disney estimated to have been worth $50 million or more to her.

While the exact figures of J.K. Rowling's contract with Universal Destinations & Experiences are not public, financial analysts and industry reports suggest she earns tens of millions of dollars annually in royalties from the Wizarding World of Harry Potter. Her deal is reportedly one of the most lucrative in theme park history, encompassing a percentage of every ticket sold, every "Butterbeer" consumed, and every piece of merchandise—from interactive wands to house robes—purchased across Universal's parks in Orlando, Hollywood, Japan, and Beijing. Some estimates suggest her royalty rate on merchandise and food could be as high as 10% to 15%, alongside a massive annual licensing fee. With the upcoming 2025 opening of Epic Universe in Orlando, which features an entirely new Harry Potter-themed land (Ministry of Magic), her earnings are projected to spike significantly in 2026. This ongoing revenue stream is a primary reason why Rowling remains one of the wealthiest authors in history, as the "Harry Potter" brand continues to be a cornerstone of Universal's global profitability and expansion strategy.