In Dungeons & Dragons 5th Edition, a bonus action is a game term that describes a small, secondary effort you can take on your turn, using the same timing rules as ordinary actions but limited to one per turn unless a feature says otherwise. A bonus action lets you do something meaningful without giving up your main action, but it usually trades quantity for speed or complementary effects. This evergreen explainer covers what a bonus action is, when you can take one, common sources of bonus actions, and how they interact with reactions, movement, and spellcasting for players and DMs who want reliable, consistent use of this mechanic at the table.
Core definition and purpose of a bonus action
A bonus action is one of the formal action types in D&D 5e, alongside a regular action and a movement. You can take only one bonus action on your turn, and you can take it either before or after your regular action, provided a feature or rule allows it. Many class features, spells, and item abilities use the bonus action timing because it offers a focused, limited use of effort that complements your primary activity. Unlike a reaction, which is triggered by specific events, a bonus action is generally under your direct control on your turn, subject to conditions such as being grappled or incapacitated.
When you can and cannot take a bonus action
Standard rules and restrictions
You can take a bonus action on your turn if you are not incapacitated and you are not grappling with one hand while trying to perform somatic spell components, unless a feature removes that restriction. You can also take a bonus action while holding something in at least one hand, as long as you meet any specific requirements. If you are incapacitated, you cannot take a bonus action; if you are grappled and your hands are occupied, normal rules still allow a bonus action unless a specific interaction or DM judgment says otherwise. You cannot take a bonus action during someone else’s turn unless a feature specifically uses timing such as "when you take the Attack action" or explicitly targets the start of your turn.
Conditions that affect timing
- Incapacitated: No bonus action.
- Grappled: Generally allowed unless hands are needed for components and no hand is free.
- Unconscious: No bonus action.
- Petrified or paralyzed: No bonus action.
Common sources of bonus actions for players
Class features
Several class features grant bonus actions by name or by type. Rogues get Cunning Action, which lets them Dash, Disengage, or Hide as a bonus action, supporting mobility and positioning. Monks gain features such as Step of the Way and Patient Defense that often use the bonus action slot. Fighters can use the Action Surge on their turn to take an additional action, which can include a bonus action on the same turn, while Battle Master maneuvers frequently require a bonus action to trigger their tactical effects. Other subclasses, from Eldritch Knights to Arcane Tricksters, include signature abilities that consume the bonus action to enable powerful combinations.
Spells and magic items
The spell haste notably gives an additional action on your turn, which can include a bonus action, dramatically increasing your capacity to cast, attack, or take other limited options. Lesser Restoration and certain ritual behaviors can interact with or benefit from timing choices, but they do not grant bonus actions themselves. Magic items such as the Deck of Many Things draw effects that may reference a bonus action, and certain artifacts embed on-use features that trigger in the bonus action slot. Reliable item-based bonus actions typically require attunement or have limited charges, shaping how often they can be used.
Monster and DM-facing uses
For DMs, granting monsters or NPCs a bonus action helps structure their turns without overloading them with multiple full actions. Many creatures use bonus actions for special movement, defensive reactions, or utility effects that make them more dynamic. When designing encounters, DMs can use bonus actions to signal intent, reinforce themes, or create tactical trade-offs that reward players who understand timing and opportunity costs.
Interaction with reactions, movement, and spellcasting
Reactions versus bonus actions
Reactions are triggered by specific events and occur in response to conditions during someone else’s turn, while a bonus action happens on your own turn as part of your routine activity. You can take a bonus action and then use a reaction later in the same round if you are able, subject to the once-per-round reaction rule. Since reactions are distinct from actions and bonus actions, features that require you to take a bonus action usually cannot be satisfied by spending a reaction instead.
Movement and attack interactions
Taking a bonus action does not directly reduce your movement, because movement is tracked separately, though certain combinations can influence your available options. For example, Attack action with Extra Attack, a bonus action to Dash, and movement all coexist on the same turn when your speed and features allow. Some class features and spells explicitly interact with how you allocate action types, letting you customize how much of your turn is devoted to attacking, defending, or positioning.
Spellcasting constraints
Most cantrips require only an action or a bonus action to cast, giving flexibility in how you structure your turn. Regular spells that have casting times of 1 action can replace your action for that turn, while some spells and features allow you to cast using a bonus action under specific conditions. Concentration spells persist across different turn components, so you can take a bonus action for another purpose provided you maintain concentration according to the rules.
Strategic trade-offs and common pitfalls
Because you can only take one bonus action per turn, choosing which feature to use is often a meaningful trade-off. Using Cunning Action to Dash may improve survivability but forgo a Hide attempt that could enable a critical ambush. Many powerful options, from spellcasting tweaks to attack combinations, require you to spend the bonus action, so timing is central to optimization. DMs can highlight these trade-offs by describing environmental factors, opportunity costs, and creature capabilities so that players understand what they gain and lose when they select a bonus action option.
Practical guidance for DMs and tables
Clarifying timing and intent
To avoid confusion, DMs should state clearly when a feature requires a bonus action and remind players that only one such action is allowed per turn. Encouraging players to announce a bonus action before they take it can streamline turns and reduce disputes over sequencing. Clear expectations about when a bonus action can be used, especially in conjunction with reactions or movement features, help maintain a smooth, fair play experience.
Design considerations
When creating homebrew or adapting existing content, DMs can use bonus actions to tune monster abilities or class features without overloading a turn. Giving a creature a bonus action that provides tactical value, such as additional movement or a minor effect, can make encounters more engaging while respecting action economy. For players, emphasizing the long-term benefits and limitations of bonus action features supports meaningful character building and cooperative planning.