Patent boxes are tax incentive schemes aimed at stimulating research and development (R&D) in firms by providing favourable tax rates to profits that can be linked to a specific immaterial asset, such as a patent. Because these profits are often hard to separate from other firm profits, patent boxes have been argued to be prone to tax shifting of firms, and tax competition between nations, as they might shift the location of the profits without affecting the location of R&D activities. Whether or not this occurs may also depend on conditions set in the patent box. We evaluate the innovation box policy instrument in the Netherlands, which is essentially a patent box, but without the formal requirement of a patent. We ask whether the ...