Some modifications may be researched only after the previous ones. Vehicle modifications are divided into four tiers.

The number of modification RPs always coincides with the number of research points earned. Modifications Research Points are the 'experience' that a player can spend on researching the modifications of the vehicle on which they were earned. Using the previous vehicle in the line to research the next vehicle has a bonus of +30% RP gain in Arcade Battles, and a +10% RP gain in Realistic/Simulator Battles. In the research of lower-rank vehicles with a higher-ranking premium vehicle, there are no penalties. When researching a vehicle using a vehicle of a different rank, a reduction factor may be applied to the RP obtained ( see table). The number of points earned depends on the battle RPs earned and the difference in ranks between the researching vehicle and the vehicle on which the RPs were earned. Vehicle Research Points are 'experience' that a player can spend on researching locked vehicles. Convertible research point is given the same, total amount of RP as gained in combat and not deducted or divided from the total.Crew experience for the crew slots that were used in battle.Research of the next modification in the vehicle used in battle.Research of the next chosen vehicle of the nation.RP earned in battle are distributed to the following funds: RP is also earned as a vehicle's modules are unlocked, those earnings go to unlock the selected vehicle. So a player who helped the allies in a battle, performed mission tasks, earned various achievements, and was close to the epicenter of the battle earns, accordingly, more RP than the player who neglected teamwork or the game objective. Gaining RP in War Thunder's economy depends on many factors, but the key ones are: game mode, destroyed vehicle, activity in battle, and the outcome of the battle (victory or defeat). RP gain in the game depends on the game mode played. Research Points (RP), or 'experience', is used to research and advance in vehicles, modifications, and crew training.

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