Premium tanks are single-configuration tanks that are located outside of their nations' tech trees. All premium tanks come with Elite status and require no module research. Most premium tanks benefit from greater credit income than regular tanks. This credit bonus increases with the tiers, which makes standard tier VIII premiums the most profitable tanks available to all players in the game. Many players regularly play tier VIII or other premiums to earn the credits necessary to pay for new tanks, modules, equipment, etc. The one exception to this are special event vehicles , which are premium tanks given as rewards for missions and other competitions some examples are the StuG IV and the T28 Concept. Such vehicles benefit from all of the advantages of regular premium tanks, except the increased credit income.