The Netherlands is a mature oil and gas producing country and licences operate under a concession regime. The regime includes an onshore royalty, corporate income tax and a state profit share. The onshore royalty is calculated for oil and gas in each licence. Rates apply to individual production tiers and increase without state participation. There is a mutual interaction between corporate income tax and state profit share tax. The country pursues an 'Open Door' licensing policy with no dedicated licensing rounds. The state also typically holds a direct interest via EBN.