Same-type attack bonus

The same-type attack bonus (Japanese: タイプ一致ボーナス coincident type bonus), abbreviated STAB, boosts the damage dealt when a move is used by a Pokémon of the same type.

Gladion's Silvally using Multi-Attack

In the core series

The same-type attack bonus is a 50% damage boost of power to direct damage from a attack when it is the same type as one of the types of the Pokémon using the attack. This results in a ×1.5 multiply of damage (×2 if the Pokémon has the Adaptability Ability). Indirect damage coming out as a consequence of a move, ability or item doesn't get STAB, even when deals typed damage like Stealth Rock. Typeless Pokémon don't get this bonus dealing typeless damage either. It was introduced in Generation I and has remained unchanged since.

A Pokémon only receives the same-type attack bonus on the current type of the move, not its listed type. For example, if the user's type matches their Hidden Power type, they do receive same-type attack bonus; however, since a Normal-type Hidden Power is not possible, a pure Normal-type Pokémon cannot receive the same-type attack bonus for Hidden Power. The same is also true for Fairy-type.

If Protean or Libero is activated before a move's execution, the user will always receive a same-type attack bonus on every move used, regardless of the move's type. Arceus, Silvally and Oricorio always get the boost from Judgment, Multi-Attack and Revelation Dance without outside type modifications respectively because they change type on the same conditions as their signature moves. Morpeko's move Aura Wheel also always gets the boost because it changes type between both of this Pokémon. Normal-type Pokémon with Normalize will get boost with any damage dealing move.

Although Flying Press changes its power to work like a Fighting and Flying-type move, only Fighting-type Pokémon get STAB from using it. That's why Pokémon which have both of these types like Hawlucha get the STAB only once.

Unaffected moves

Some special or physical moves don't get STAB even when there is the type match.

Move	Type	Category	Power	Accuracy	Description
Struggle	Normal	Physical	50	100%^{Gen I-III} —^{Gen IV+}	Since Generation II, despite being classified as a Normal-type move, when used Struggle is unaffected by typing.
Beat Up	Dark	Physical	10*^{Gen II-IV} Varies^{Gen V+}	100%	In Generations II-IV, despite being classified as a Dark-type move, when used Beat Up is unaffected by typing.
Fissure	Ground	Physical	—	30%^{Gen I} Varies^{Gen II+}	One-hit knockout move
Guillotine	Normal	Physical	—	30%^{Gen I} Varies^{Gen II+}	One-hit knockout move
Horn Drill	Normal	Physical	—	30%^{Gen I} Varies^{Gen II+}	One-hit knockout move
Sheer Cold	Ice	Special	—	Varies	One-hit knockout move
Bide	Normal	Physical	Varies	100^{Gen II-III} —^{Gen IV+}	Deals twice the damage it withstands. It can only hit Ghost-type Pokémon in Generation I and IV.
Counter	Fighting	Physical	—	100%	Deals twice the damage it withstands. From Generation II onwards it can not hit Ghost-type Pokémon.
Endeavor	Normal	Physical	—	100%	Lowers target's HP to users HP if is higher.
Final Gambit	Fighting	Special	—	100%	Causes the user to faint, and the target receives damage equal to how much HP the user lost .
Guardian of Alola	Fairy	Special	—	—	Deals damage equal to 75% of the opponent's remaining HP.
Metal Burst	Steel	Physical	Varies	100%	Returns 1.5 times the damage dealt by the foe's last attack.
Mirror Coat	Psychic	Special	—	100%	Deals twice the damage it withstands, although it cannot hit Dark-type Pokémon.
Nature's Madness	Fairy	Special	—	90%	Deals damage equal to 50% of the opponent's remaining HP, but always deals at least 1 HP of damage
Night Shade	Ghost	Special	Varies	100%	Inflicts damage equal to the user's level. From Generation II onwards it can not hit Normal-type Pokémon.
Psywave	Psychic	Special	Varies	80^{Gen I-V} 100^{Gen VI+}	Inflicts random damage, although it cannot hit Dark-type Pokémon.
Seismic Toss	Fighting	Physical	Varies	100%	Inflicts damage equal to the user's level. From Generation II onwards it can not hit Ghost-type Pokémon.
Super Fang	Normal	Physical	Varies	90%	Deals damage equal to 50% of the opponent's remaining HP, but always deals at least 1 HP of damage. From Generation II onwards it can not hit Ghost-type Pokémon.
Revelation Dance	Normal	Special	90	100%	Revelation Dance deals typless damage if the first type of the Pokémon using it is Unknown.
Dragon Rage	Dragon	Special	—	100%	Deals exactly 40HP of damage if it hits.
Sonic Boom	Normal	Special	—	90%	Deals exactly 20HP of damage if it hits. From Generation II onwards it can not hit Ghost-type Pokémon.

Trivia

Contrary to what some early strategy guides stated, Normal-type attacks can receive the same-type attack bonus.

In other languages

Language		Title
European French		Bonus d'attaque de même type
German		Typen-Bonus
Italian		Bonus di tipo
Korean		자속보정 Jasokbojeong
European Spanish		Daño adicional por afinidad de tipos