The Sunday Times released it’s annual Rich List for people in Ireland and Britain. JKR has made number 136 on the list.
The article says:

“Harry Potter and the Deathly Hallows, the seventh and final book in the series, will be published in July. Her royalties add up to 365m (sterling) while merchandising and film income take Rowling, 41, to 545m. The final book and the next three films guarantee her income stream. Last year she helped set up a new children’s charity.”

Thanks Mugglenet