diff --git a/src/abstract_tree/assignment.rs b/src/abstract_tree/assignment.rs
index 4ecc505..40af64c 100644
--- a/src/abstract_tree/assignment.rs
+++ b/src/abstract_tree/assignment.rs
@@ -9,14 +9,28 @@ use super::{AbstractTree, Action, Identifier, Statement, Type};
 pub struct Assignment<'src> {
     identifier: Identifier,
     r#type: Option<Type>,
+    operator: AssignmentOperator,
     statement: Box<Statement<'src>>,
 }
 
+#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
+pub enum AssignmentOperator {
+    Assign,
+    AddAssign,
+    SubAssign,
+}
+
 impl<'src> Assignment<'src> {
-    pub fn new(identifier: Identifier, r#type: Option<Type>, statement: Statement<'src>) -> Self {
+    pub fn new(
+        identifier: Identifier,
+        r#type: Option<Type>,
+        operator: AssignmentOperator,
+        statement: Statement<'src>,
+    ) -> Self {
         Self {
             identifier,
             r#type,
+            operator,
             statement: Box::new(statement),
         }
     }
@@ -71,6 +85,7 @@ mod tests {
         Assignment::new(
             Identifier::new("foobar"),
             None,
+            AssignmentOperator::Assign,
             Statement::Expression(Expression::Value(ValueNode::Integer(42))),
         )
         .run(&context)
@@ -87,6 +102,7 @@ mod tests {
         let validation = Assignment::new(
             Identifier::new("foobar"),
             Some(Type::Boolean),
+            AssignmentOperator::Assign,
             Statement::Expression(Expression::Value(ValueNode::Integer(42))),
         )
         .validate(&Context::new());
diff --git a/src/abstract_tree/mod.rs b/src/abstract_tree/mod.rs
index aebd480..b84b9db 100644
--- a/src/abstract_tree/mod.rs
+++ b/src/abstract_tree/mod.rs
@@ -11,8 +11,16 @@ pub mod r#type;
 pub mod value_node;
 
 pub use self::{
-    assignment::Assignment, block::Block, expression::Expression, identifier::Identifier,
-    index::Index, logic::Logic, math::Math, r#loop::Loop, r#type::Type, statement::Statement,
+    assignment::{Assignment, AssignmentOperator},
+    block::Block,
+    expression::Expression,
+    identifier::Identifier,
+    index::Index,
+    logic::Logic,
+    math::Math,
+    r#loop::Loop,
+    r#type::Type,
+    statement::Statement,
     value_node::ValueNode,
 };
 
diff --git a/src/parser.rs b/src/parser.rs
index 9e548df..3cc4909 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -222,10 +222,14 @@ pub fn parser<'src>() -> DustParser<'src> {
 
         let assignment = identifier
             .then(type_specification.clone().or_not())
-            .then_ignore(just(Token::Operator(Operator::Assign)))
+            .then(choice((
+                just(Token::Operator(Operator::Assign)).to(AssignmentOperator::Assign),
+                just(Token::Operator(Operator::AddAssign)).to(AssignmentOperator::AddAssign),
+                just(Token::Operator(Operator::SubAssign)).to(AssignmentOperator::SubAssign),
+            )))
             .then(statement.clone())
-            .map(|((identifier, r#type), statement)| {
-                Statement::Assignment(Assignment::new(identifier, r#type, statement))
+            .map(|(((identifier, r#type), operator), statement)| {
+                Statement::Assignment(Assignment::new(identifier, r#type, operator, statement))
             })
             .boxed();
 
@@ -406,6 +410,7 @@ mod tests {
             Statement::Assignment(Assignment::new(
                 Identifier::new("foobar"),
                 None,
+                AssignmentOperator::Assign,
                 Statement::Expression(Expression::Value(ValueNode::Integer(1)))
             )),
         );
@@ -418,6 +423,7 @@ mod tests {
             Statement::Assignment(Assignment::new(
                 Identifier::new("foobar"),
                 Some(Type::Integer),
+                AssignmentOperator::Assign,
                 Statement::Expression(Expression::Value(ValueNode::Integer(1)))
             )),
         );
@@ -430,6 +436,7 @@ mod tests {
             Statement::Assignment(Assignment::new(
                 Identifier::new("foobar"),
                 Some(Type::Custom(Identifier::new("Foo"))),
+                AssignmentOperator::Assign,
                 Statement::Expression(Expression::Value(ValueNode::Enum(
                     Identifier::new("Foo"),
                     Identifier::new("Bar")
@@ -445,6 +452,7 @@ mod tests {
             Statement::Assignment(Assignment::new(
                 Identifier::new("foobar"),
                 Some(Type::List),
+                AssignmentOperator::Assign,
                 Statement::Expression(Expression::Value(ValueNode::List(vec![])))
             )),
         );
@@ -454,6 +462,7 @@ mod tests {
             Statement::Assignment(Assignment::new(
                 Identifier::new("foobar"),
                 Some(Type::ListOf(Box::new(Type::Integer))),
+                AssignmentOperator::Assign,
                 Statement::Expression(Expression::Value(ValueNode::List(vec![])))
             )),
         );
@@ -463,6 +472,7 @@ mod tests {
             Statement::Assignment(Assignment::new(
                 Identifier::new("foobar"),
                 Some(Type::ListExact(vec![Type::Integer, Type::String])),
+                AssignmentOperator::Assign,
                 Statement::Expression(Expression::Value(ValueNode::List(vec![
                     Expression::Value(ValueNode::Integer(42)),
                     Expression::Value(ValueNode::String("foo"))