The Daily Mail says the star will be paid $25 million for both Harry Potter And The Half-Blood Prince and The Deathly Hallows - although this will be reduced by tax, commission and agents' and managers' fees.
The large figure is said to be down to his importance to the series and the fact that being type cast as Potter could harm his later career.
Radcliffe, although he did not confirm the amount, said proceeds from the Potter films meant he could pursue other, less profitable, projects without concern.
"Obviously, I'm in a very fortunate position where I don't have to do things for the money," he explained. "I can simply do them because there's an interesting character and a good director involved.
"The money is absolutely fantastic and I'm very grateful, but it's not the main thing that drives me. Being on Fortune [magazine] lists is all very nice, but I am my own person. What people write about me doesn't make me who I am."