diff --git a/src/compiler/compiler.ts b/src/compiler/compiler.ts
index 4e35747..6934f06 100644
--- a/src/compiler/compiler.ts
+++ b/src/compiler/compiler.ts
@@ -9,6 +9,7 @@ import {
   checkTreeForErrors,
   getAllChildren,
   getAssignmentParts,
+  getCompoundAssignmentParts,
   getBinaryParts,
   getDotGetParts,
   getFunctionCallParts,
@@ -247,6 +248,34 @@ export class Compiler {
         return instructions
       }
 
+      case terms.CompoundAssign: {
+        const { identifier, operator, right } = getCompoundAssignmentParts(node)
+        const identifierName = input.slice(identifier.from, identifier.to)
+        const instructions: ProgramItem[] = []
+
+        // will throw if undefined
+        instructions.push(['LOAD', identifierName])
+
+        instructions.push(...this.#compileNode(right, input))
+
+        const opValue = input.slice(operator.from, operator.to)
+        switch (opValue) {
+          case '+=': instructions.push(['ADD']); break
+          case '-=': instructions.push(['SUB']); break
+          case '*=': instructions.push(['MUL']); break
+          case '/=': instructions.push(['DIV']); break
+          case '%=': instructions.push(['MOD']); break
+          default:
+            throw new CompilerError(`Unknown compound operator: ${opValue}`, operator.from, operator.to)
+        }
+
+        // DUP and store (same as regular assignment)
+        instructions.push(['DUP'])
+        instructions.push(['STORE', identifierName])
+
+        return instructions
+      }
+
       case terms.ParenExpr: {
         const child = node.firstChild
         if (!child) return [] // I guess it is empty parentheses?
diff --git a/src/compiler/tests/compiler.test.ts b/src/compiler/tests/compiler.test.ts
index 4d662c3..7a67a9e 100644
--- a/src/compiler/tests/compiler.test.ts
+++ b/src/compiler/tests/compiler.test.ts
@@ -64,6 +64,38 @@ describe('compiler', () => {
     expect('sum = 2 + 3; sum').toEvaluateTo(5)
   })
 
+  test('compound assignment +=', () => {
+    expect('x = 10; x += 5; x').toEvaluateTo(15)
+  })
+
+  test('compound assignment -= ', () => {
+    expect('x = 10; x -= 3; x').toEvaluateTo(7)
+  })
+
+  test('compound assignment *=', () => {
+    expect('x = 5; x *= 3; x').toEvaluateTo(15)
+  })
+
+  test('compound assignment /=', () => {
+    expect('x = 20; x /= 4; x').toEvaluateTo(5)
+  })
+
+  test('compound assignment %=', () => {
+    expect('x = 17; x %= 5; x').toEvaluateTo(2)
+  })
+
+  test('compound assignment with expression', () => {
+    expect('x = 10; x += 2 + 3; x').toEvaluateTo(15)
+  })
+
+  test('compound assignment returns value', () => {
+    expect('x = 5; x += 10; x').toEvaluateTo(15)
+  })
+
+  test('compound assignment fails on undefined variable', () => {
+    expect('undefined-var += 5').toFailEvaluation()
+  })
+
   test('parentheses', () => {
     expect('(2 + 3) * 4').toEvaluateTo(20)
   })
diff --git a/src/compiler/utils.ts b/src/compiler/utils.ts
index c5fb786..96f6bee 100644
--- a/src/compiler/utils.ts
+++ b/src/compiler/utils.ts
@@ -57,6 +57,27 @@ export const getAssignmentParts = (node: SyntaxNode) => {
   return { identifier: left, right }
 }
 
+export const getCompoundAssignmentParts = (node: SyntaxNode) => {
+  const children = getAllChildren(node)
+  const [left, operator, right] = children
+
+  if (!left || left.type.id !== terms.AssignableIdentifier) {
+    throw new CompilerError(
+      `CompoundAssign left child must be an AssignableIdentifier, got ${left ? left.type.name : 'none'}`,
+      node.from,
+      node.to
+    )
+  } else if (!operator || !right) {
+    throw new CompilerError(
+      `CompoundAssign expected 3 children, got ${children.length}`,
+      node.from,
+      node.to
+    )
+  }
+
+  return { identifier: left, operator, right }
+}
+
 export const getFunctionDefParts = (node: SyntaxNode, input: string) => {
   const children = getAllChildren(node)
   const [fnKeyword, paramsNode, colon, ...rest] = children
diff --git a/src/parser/operatorTokenizer.ts b/src/parser/operatorTokenizer.ts
index ee1dc44..3c85400 100644
--- a/src/parser/operatorTokenizer.ts
+++ b/src/parser/operatorTokenizer.ts
@@ -10,7 +10,14 @@ const operators: Array<Operator> = [
   { str: '!=', tokenName: 'Neq' },
   { str: '==', tokenName: 'EqEq' },
 
-  // // Single-char operators
+  // Compound assignment operators (must come before single-char operators)
+  { str: '+=', tokenName: 'PlusEq' },
+  { str: '-=', tokenName: 'MinusEq' },
+  { str: '*=', tokenName: 'StarEq' },
+  { str: '/=', tokenName: 'SlashEq' },
+  { str: '%=', tokenName: 'ModuloEq' },
+
+  // Single-char operators
   { str: '*', tokenName: 'Star' },
   { str: '=', tokenName: 'Eq' },
   { str: '/', tokenName: 'Slash' },
diff --git a/src/parser/shrimp.grammar b/src/parser/shrimp.grammar
index 80cdef5..9da24da 100644
--- a/src/parser/shrimp.grammar
+++ b/src/parser/shrimp.grammar
@@ -6,7 +6,7 @@
 
 @top Program { item* }
 
-@external tokens operatorTokenizer from "./operatorTokenizer" { Star, Slash, Plus, Minus, And, Or, Eq, EqEq, Neq, Lt, Lte, Gt, Gte, Modulo }
+@external tokens operatorTokenizer from "./operatorTokenizer" { Star, Slash, Plus, Minus, And, Or, Eq, EqEq, Neq, Lt, Lte, Gt, Gte, Modulo, PlusEq, MinusEq, StarEq, SlashEq, ModuloEq }
 
 @tokens {
   @precedence { Number Regex }
@@ -55,6 +55,7 @@ consumeToTerminator {
   Throw |
   IfExpr |
   FunctionDef |
+  CompoundAssign |
   Assign |
   BinOp |
   ConditionalOp |
@@ -181,6 +182,10 @@ Assign {
   AssignableIdentifier Eq consumeToTerminator
 }
 
+CompoundAssign {
+  AssignableIdentifier (PlusEq | MinusEq | StarEq | SlashEq | ModuloEq) consumeToTerminator
+}
+
 BinOp {
   expression !multiplicative Modulo expression |
   (expression | BinOp) !multiplicative Star (expression | BinOp) |
diff --git a/src/parser/shrimp.terms.ts b/src/parser/shrimp.terms.ts
index 8a80f73..ab4011b 100644
--- a/src/parser/shrimp.terms.ts
+++ b/src/parser/shrimp.terms.ts
@@ -14,45 +14,51 @@ export const
   Gt = 12,
   Gte = 13,
   Modulo = 14,
-  Identifier = 15,
-  AssignableIdentifier = 16,
-  Word = 17,
-  IdentifierBeforeDot = 18,
-  Do = 19,
-  Program = 20,
-  PipeExpr = 21,
-  FunctionCall = 22,
-  DotGet = 23,
-  Number = 24,
-  ParenExpr = 25,
-  FunctionCallOrIdentifier = 26,
-  BinOp = 27,
-  String = 28,
-  StringFragment = 29,
-  Interpolation = 30,
-  EscapeSeq = 31,
-  Boolean = 32,
-  Regex = 33,
-  Dict = 34,
-  NamedArg = 35,
-  NamedArgPrefix = 36,
-  FunctionDef = 37,
-  Params = 38,
-  colon = 39,
-  CatchExpr = 40,
-  keyword = 63,
-  TryBlock = 42,
-  FinallyExpr = 43,
-  Underscore = 46,
-  Array = 47,
-  Null = 48,
-  ConditionalOp = 49,
-  PositionalArg = 50,
-  TryExpr = 52,
-  Throw = 54,
-  IfExpr = 56,
-  SingleLineThenBlock = 58,
-  ThenBlock = 59,
-  ElseIfExpr = 60,
-  ElseExpr = 62,
-  Assign = 64
+  PlusEq = 15,
+  MinusEq = 16,
+  StarEq = 17,
+  SlashEq = 18,
+  ModuloEq = 19,
+  Identifier = 20,
+  AssignableIdentifier = 21,
+  Word = 22,
+  IdentifierBeforeDot = 23,
+  Do = 24,
+  Program = 25,
+  PipeExpr = 26,
+  FunctionCall = 27,
+  DotGet = 28,
+  Number = 29,
+  ParenExpr = 30,
+  FunctionCallOrIdentifier = 31,
+  BinOp = 32,
+  String = 33,
+  StringFragment = 34,
+  Interpolation = 35,
+  EscapeSeq = 36,
+  Boolean = 37,
+  Regex = 38,
+  Dict = 39,
+  NamedArg = 40,
+  NamedArgPrefix = 41,
+  FunctionDef = 42,
+  Params = 43,
+  colon = 44,
+  CatchExpr = 45,
+  keyword = 68,
+  TryBlock = 47,
+  FinallyExpr = 48,
+  Underscore = 51,
+  Array = 52,
+  Null = 53,
+  ConditionalOp = 54,
+  PositionalArg = 55,
+  TryExpr = 57,
+  Throw = 59,
+  IfExpr = 61,
+  SingleLineThenBlock = 63,
+  ThenBlock = 64,
+  ElseIfExpr = 65,
+  ElseExpr = 67,
+  CompoundAssign = 69,
+  Assign = 70
diff --git a/src/parser/shrimp.ts b/src/parser/shrimp.ts
index ec84f41..172f6a7 100644
--- a/src/parser/shrimp.ts
+++ b/src/parser/shrimp.ts
@@ -4,24 +4,24 @@ import {operatorTokenizer} from "./operatorTokenizer"
 import {tokenizer, specializeKeyword} from "./tokenizer"
 import {trackScope} from "./scopeTracker"
 import {highlighting} from "./highlight"
-const spec_Identifier = {__proto__:null,catch:82, finally:88, end:90, null:96, try:106, throw:110, if:114, elseif:122, else:126}
+const spec_Identifier = {__proto__:null,catch:92, finally:98, end:100, null:106, try:116, throw:120, if:124, elseif:132, else:136}
 export const parser = LRParser.deserialize({
   version: 14,
-  states: "8xQYQbOOO#tQcO'#CvO$qOSO'#CxO%PQbO'#E`OOQ`'#DR'#DROOQa'#DO'#DOO&SQbO'#D]O'XQcO'#ETOOQa'#ET'#ETO)cQcO'#ESO)vQRO'#CwO+SQcO'#EOO+dQcO'#EOO+nQbO'#CuO,fOpO'#CsOOQ`'#EP'#EPO,kQbO'#EOO,rQQO'#EfOOQ`'#Db'#DbO,wQbO'#DdO,wQbO'#EhOOQ`'#Df'#DfO-lQRO'#DnOOQ`'#EO'#EOO-qQQO'#D}OOQ`'#D}'#D}OOQ`'#Do'#DoQYQbOOO-yQbO'#DPOOQa'#ES'#ESOOQ`'#D`'#D`OOQ`'#Ee'#EeOOQ`'#Dv'#DvO.TQbO,59^O.nQbO'#CzO.vQWO'#C{OOOO'#EV'#EVOOOO'#Dp'#DpO/[OSO,59dOOQa,59d,59dOOQ`'#Dr'#DrO/jQbO'#DSO/rQQO,5:zOOQ`'#Dq'#DqO/wQbO,59wO0OQQO,59jOOQa,59w,59wO0ZQbO,59wO,wQbO,59cO,wQbO,59cO,wQbO,59cO,wQbO,59yO,wQbO,59yO,wQbO,59yO0eQRO,59aO0lQRO,59aO0}QRO,59aO0xQQO,59aO1YQQO,59aO1bObO,59_O1mQbO'#DwO1xQbO,59]O2aQbO,5;QO2tQcO,5:OO3jQcO,5:OO3zQcO,5:OO4pQRO,5;SO4wQRO,5;SO5SQbO,5:YOOQ`,5:i,5:iOOQ`-E7m-E7mOOQ`,59k,59kOOQ`-E7t-E7tOOOO,59f,59fOOOO,59g,59gOOOO-E7n-E7nOOQa1G/O1G/OOOQ`-E7p-E7pO5dQbO1G0fOOQ`-E7o-E7oO5wQQO1G/UOOQa1G/c1G/cO6SQbO1G/cOOQO'#Dt'#DtO5wQQO1G/UOOQa1G/U1G/UOOQ`'#Du'#DuO6SQbO1G/cOOQa1G.}1G.}O6{QcO1G.}O7VQcO1G.}O7aQcO1G.}OOQa1G/e1G/eO9PQcO1G/eO9WQcO1G/eO9_QcO1G/eOOQa1G.{1G.{OOQa1G.y1G.yO!aQbO'#CvO&ZQbO'#CrOOQ`,5:c,5:cOOQ`-E7u-E7uO9fQbO1G0lO9qQbO1G0mO:_QbO1G0nOOQ`1G/t1G/tO:rQbO7+&QO9qQbO7+&SO:}QQO7+$pOOQa7+$p7+$pO;YQbO7+$}OOQa7+$}7+$}OOQO-E7r-E7rOOQ`-E7s-E7sO;dQbO'#DUO;iQQO'#DXOOQ`7+&W7+&WO;nQbO7+&WO;sQbO7+&WOOQ`'#Ds'#DsO;{QQO'#DsO<QQbO'#EaOOQ`'#DW'#DWO<tQbO7+&XOOQ`'#Dh'#DhO=PQbO7+&YO=UQbO7+&ZOOQ`<<Il<<IlO=rQbO<<IlO=wQbO<<IlO>PQbO<<InOOQa<<H[<<H[OOQa<<Hi<<HiO>[QQO,59pO>aQbO,59sOOQ`<<Ir<<IrO>tQbO<<IrOOQ`,5:_,5:_OOQ`-E7q-E7qOOQ`<<Is<<IsO>yQbO<<IsO?OQbO<<IsOOQ`<<It<<ItOOQ`'#Di'#DiO?WQbO<<IuOOQ`AN?WAN?WO?cQbOAN?WOOQ`AN?YAN?YO?hQbOAN?YO?mQbOAN?YO?uQbO1G/[O@YQbO1G/_OOQ`1G/_1G/_OOQ`AN?^AN?^OOQ`AN?_AN?_O@pQbOAN?_O,wQbO'#DjOOQ`'#Dx'#DxO@uQbOAN?aOAQQQO'#DlOOQ`AN?aAN?aOAVQbOAN?aOOQ`G24rG24rOOQ`G24tG24tOA[QbOG24tOAaQbO7+$vOOQ`7+$v7+$vOOQ`7+$y7+$yOOQ`G24yG24yOAzQRO,5:UOBRQRO,5:UOOQ`-E7v-E7vOOQ`G24{G24{OB^QbOG24{OBcQQO,5:WOOQ`LD*`LD*`OOQ`<<Hb<<HbOBhQQO1G/pOOQ`LD*gLD*gO@YQbO1G/rO=UQbO7+%[OOQ`7+%^7+%^OOQ`<<Hv<<Hv",
-  stateData: "Bp~O!oOS!pOS~O_PO`fOaWOb^OcROhWOpWOqWO!QWO!VaO!XcO!ZdO!u]O!xQO#PTO#QUO#RiO~O_mOaWOb^OcROhWOpWOqWOtlO!OnO!QWO!u]O!xQO#PTO#QUO!TjX#RjX#^jX#WjXyjX|jX}jX~OP!vXQ!vXR!vXS!vXT!vXU!vXW!vXX!vXY!vXZ!vX[!vX]!vX^!vX~P!aOmtO!xwO!zrO!{sO~O_xOwvP~O_mOaWOb^OhWOpWOqWOtlO!QWO!u]O!xQO#PTO#QUO#R{O~O#V!OO~P%XO_mOaWOb^OcROhWOpWOqWOtlO!OnO!QWO!u]O!xQO#PTO#QUO~OP!wXQ!wXR!wXS!wXT!wXU!wXW!wXX!wXY!wXZ!wX[!wX]!wX^!wX#R!wX#^!wX#W!wXy!wX|!wX}!wX~P&ZOP!vXQ!vXR!vXS!vXT!vXU!vXW!vXX!vXY!vXZ!vX[!vX]!vX^!vX~O#R!rX#^!rXy!rX|!rX}!rX~P(hOP!ROQ!ROR!SOS!SOT!UOU!VOW!TOX!TOY!TOZ!TO[!TO]!TO^!QO~O#R!rX#^!rXy!rX|!rX}!rX~OP!ROQ!ROR!SOS!SO~P*qOT!UOU!VO~P*qO_POaWOb^OcROhWOpWOqWO!QWO!u]O!xQO#PTO#QUO~O!t!]O~O!T!^O~P*qOw!`O~O_mOaWOb^OhWOpWOqWO!QWO!u]O!xQO#PTO#QUO~OV!fO~O#R!gO#^!gO~OcRO!O!iO~P,wO!Tfa#Rfa#^fa#Wfayfa|fa}fa~P&ZO_!kO!u]O~O!x!lO!z!lO!{!lO!|!lO!}!lO#O!lO~OmtO!x!nO!zrO!{sO~O_xOwvX~Ow!pO~O#V!sO~P%XOtlO#R!uO#V!wO~O#R!xO#V!sO~P,wO#W#SO~P(hOP!ROQ!ROR!SOS!SO#W#SO~OT!UOU!VO#W#SO~O!T!^O#W#SO~O_#TOh#TO!u]O~O_#UOb^O!u]O~O!T!^O#Rea#^ea#Weayea|ea}ea~O`fO!VaO!XcO!ZdO#R#ZO~P+nO#R!Wa#^!Way!Wa|!Wa}!Wa~P)vO#R!Wa#^!Way!Wa|!Wa}!Wa~OP!ROQ!ROR!SOS!SO~P3XOT!UOU!VO~P3XOT!UOU!VOW!TOX!TOY!TOZ!TO[!TO]!TO~Ow#[O~P4UOT!UOU!VOw#[O~O`fO!VaO!XcO!ZdO~P+nO`fO!VaO!XcO!ZdO#R#_O~P+nOtlO#R!uO#V#aO~O#R!xO#V#cO~P,wO^!QORkiSki#Rki#^ki#Wkiyki|ki}ki~OPkiQki~P6^OP!ROQ!RO~P6^OP!ROQ!RORkiSki#Rki#^ki#Wkiyki|ki}ki~OW!TOX!TOY!TOZ!TO[!TO]!TOT!Ri#R!Ri#^!Ri#W!Riw!Riy!Ri|!Ri}!Ri~OU!VO~P8ROU!VO~P8eOU!Ri~P8ROy#fO|#gO}#hO~O`fO!VaO!XcO!ZdO#R#kOy#TP|#TP}#TP~P+nO`fO!VaO!XcO!ZdO#R#rO~P+nOy#fO|#gO}#sO~OtlO#R!uO#V#wO~O#R!xO#V#xO~P,wO_#yO~Ow#zO~O}#{O~O|#gO}#{O~O#R#}O~O`fO!VaO!XcO!ZdO#R#kOy#TX|#TX}#TX!_#TX!a#TX~P+nOy#fO|#gO}$PO~O}$SO~O`fO!VaO!XcO!ZdO#R#kO}#TP!_#TP!a#TP~P+nO}$VO~O|#gO}$VO~Oy#fO|#gO}$XO~Ow$[O~O`fO!VaO!XcO!ZdO#R$]O~P+nO}$_O~O}$`O~O|#gO}$`O~O}$fO!_$bO!a$eO~O}$hO~O}$iO~O|#gO}$iO~O`fO!VaO!XcO!ZdO#R$kO~P+nO`fO!VaO!XcO!ZdO#R#kO}#TP~P+nO}$nO~O}$rO!_$bO!a$eO~Ow$tO~O}$rO~O}$uO~O`fO!VaO!XcO!ZdO#R#kO|#TP}#TP~P+nOw$wO~P4UOT!UOU!VOw$wO~O}$xO~O#R$yO~O#R$zO~Ohq~",
-  goto: "3U#^PPPPPPPPPPPPPPPPPPPPP#_#t$YP%X#t&^&|P'v'vPP&|'zP(_)OP)RP)_)hPPP&|P*Q*vP*}P*}P*}P+a+d+mP+qP*}+w+},T,Z,a,m,w-R-[-cPPPP-i-m._PP.w0_P1]PPPPPPPP1a1z1aPP2X2`2`2r2rpgOk!`!f!p#Z#[#_#m#r#z$[$]$k$y$zR!Z]u_O]k!^!`!f!p#Z#[#_#m#r#z$[$]$k$y$zrPO]k!`!f!p#Z#[#_#m#r#z$[$]$k$y$zzmPUVcdlq|!P!Q!R!S!T!U!V!t!y#U#V#b$bR#U!^rVO]k!`!f!p#Z#[#_#m#r#z$[$]$k$y$zzWPUVcdlq|!P!Q!R!S!T!U!V!t!y#U#V#b$bQ!krQ#T!]R#V!^pZOk!`!f!p#Z#[#_#m#r#z$[$]$k$y$zQ!X]Q!bcQ!z!RR!}!S!oWOPUV]cdklq|!P!Q!R!S!T!U!V!`!f!p!t!y#U#V#Z#[#_#b#m#r#z$[$]$b$k$y$zTtQvYoPVq#U#VQ}UQ!r|X!u}!r!v#`pgOk!`!f!p#Z#[#_#m#r#z$[$]$k$y$zYnPVq#U#VQ!Z]R!ilRzRQ#j#YQ#u#^Q$R#oR$Z#vQ#o#ZQ$m$]R$v$kQ#i#YQ#t#^Q#|#jQ$Q#oQ$W#uQ$Y#vQ$a$RR$j$Zp[Ok!`!f!p#Z#[#_#m#r#z$[$]$k$y$zQ!Y]Q!ccQ!edQ#O!VQ#Q!UR$p$bZoPVq#U#VqgOk!`!f!p#Z#[#_#m#r#z$[$]$k$y$zR#q#[Q$U#rQ${$yR$|$zT$c$U$dQ$g$UR$s$dQkOR!hkQvQR!mvQ|UR!q|QyRR!oy^#m#Z#_#r$]$k$y$zR$O#mQ!v}Q#`!rT#d!v#`Q!y!PQ#b!tT#e!y#bWqPV#U#VR!jqS!_`![R#X!_Q$d$UR$q$dTjOkShOkQ#Y!`Q#]!fQ#^!p`#l#Z#_#m#r$]$k$y$zQ#p#[Q$^#zR$l$[p`Ok!`!f!p#Z#[#_#m#r#z$[$]$k$y$zQ![]R#W!^rYO]k!`!f!p#Z#[#_#m#r#z$[$]$k$y$zYnPVq#U#VQ!PUQ!acQ!ddQ!ilQ!t|W!x!P!t!y#bQ!z!QQ!{!RQ!|!SQ#O!TQ#P!UQ#R!VR$o$bpXOk!`!f!p#Z#[#_#m#r#z$[$]$k$y$zzmPUVcdlq|!P!Q!R!S!T!U!V!t!y#U#V#b$bR!W]TuQv!PSOPV]klq!`!f!p#U#V#Z#[#_#m#r#z$[$]$k$y$zU#n#Z$]$kQ#v#_V$T#r$y$zZpPVq#U#VqbOk!`!f!p#Z#[#_#m#r#z$[$]$k$y$zqeOk!`!f!p#Z#[#_#m#r#z$[$]$k$y$z",
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-  maxTerm: 106,
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-  specialized: [{term: 15, get: (value: any, stack: any) => (specializeKeyword(value, stack) << 1), external: specializeKeyword},{term: 15, get: (value: keyof typeof spec_Identifier) => spec_Identifier[value] || -1}],
-  tokenPrec: 1547
+  tokenData: "AO~R|OX#{XY$jYZ%TZp#{pq$jqs#{st%ntu'Vuw#{wx'[xy'ayz'zz{#{{|(e|}#{}!O(e!O!P#{!P!Q+X!Q![)S![!]3t!]!^%T!^!}#{!}#O4_#O#P6T#P#Q6Y#Q#R#{#R#S6s#S#T#{#T#Y7^#Y#Z8l#Z#b7^#b#c<z#c#f7^#f#g=q#g#h7^#h#i>h#i#o7^#o#p#{#p#q@`#q;'S#{;'S;=`$d<%l~#{~O#{~~@yS$QUrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{S$gP;=`<%l#{^$qUrS!uYOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U%[UrS#XQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{^%uZrS!vYOY%nYZ#{Zt%ntu&huw%nwx&hx#O%n#O#P&h#P;'S%n;'S;=`'P<%lO%nY&mS!vYOY&hZ;'S&h;'S;=`&y<%lO&hY&|P;=`<%l&h^'SP;=`<%l%n~'[O#Q~~'aO#O~U'hUrS!{QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U(RUrS#^QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U(jWrSOt#{uw#{x!Q#{!Q![)S![#O#{#P;'S#{;'S;=`$d<%lO#{U)ZYrSmQOt#{uw#{x!O#{!O!P)y!P!Q#{!Q![)S![#O#{#P;'S#{;'S;=`$d<%lO#{U*OWrSOt#{uw#{x!Q#{!Q![*h![#O#{#P;'S#{;'S;=`$d<%lO#{U*oWrSmQOt#{uw#{x!Q#{!Q![*h![#O#{#P;'S#{;'S;=`$d<%lO#{U+^WrSOt#{uw#{x!P#{!P!Q+v!Q#O#{#P;'S#{;'S;=`$d<%lO#{U+{^rSOY,wYZ#{Zt,wtu-zuw,wwx-zx!P,w!P!Q#{!Q!},w!}#O2m#O#P0Y#P;'S,w;'S;=`3n<%lO,wU-O^rSvQOY,wYZ#{Zt,wtu-zuw,wwx-zx!P,w!P!Q0o!Q!},w!}#O2m#O#P0Y#P;'S,w;'S;=`3n<%lO,wQ.PXvQOY-zZ!P-z!P!Q.l!Q!}-z!}#O/Z#O#P0Y#P;'S-z;'S;=`0i<%lO-zQ.oP!P!Q.rQ.wUvQ#Z#[.r#]#^.r#a#b.r#g#h.r#i#j.r#m#n.rQ/^VOY/ZZ#O/Z#O#P/s#P#Q-z#Q;'S/Z;'S;=`0S<%lO/ZQ/vSOY/ZZ;'S/Z;'S;=`0S<%lO/ZQ0VP;=`<%l/ZQ0]SOY-zZ;'S-z;'S;=`0i<%lO-zQ0lP;=`<%l-zU0tWrSOt#{uw#{x!P#{!P!Q1^!Q#O#{#P;'S#{;'S;=`$d<%lO#{U1ebrSvQOt#{uw#{x#O#{#P#Z#{#Z#[1^#[#]#{#]#^1^#^#a#{#a#b1^#b#g#{#g#h1^#h#i#{#i#j1^#j#m#{#m#n1^#n;'S#{;'S;=`$d<%lO#{U2r[rSOY2mYZ#{Zt2mtu/Zuw2mwx/Zx#O2m#O#P/s#P#Q,w#Q;'S2m;'S;=`3h<%lO2mU3kP;=`<%l2mU3qP;=`<%l,wU3{UrS|QOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U4fW#WQrSOt#{uw#{x!_#{!_!`5O!`#O#{#P;'S#{;'S;=`$d<%lO#{U5TVrSOt#{uw#{x#O#{#P#Q5j#Q;'S#{;'S;=`$d<%lO#{U5qU#VQrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~6YO#R~U6aU#]QrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U6zUrS!TQOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U7cYrSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#o7^#o;'S#{;'S;=`$d<%lO#{U8YUyQrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{U8qZrSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#U9d#U#o7^#o;'S#{;'S;=`$d<%lO#{U9i[rSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#`7^#`#a:_#a#o7^#o;'S#{;'S;=`$d<%lO#{U:d[rSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#g7^#g#h;Y#h#o7^#o;'S#{;'S;=`$d<%lO#{U;_[rSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#X7^#X#Y<T#Y#o7^#o;'S#{;'S;=`$d<%lO#{U<[YuQrSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#o7^#o;'S#{;'S;=`$d<%lO#{^=RY#SWrSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#o7^#o;'S#{;'S;=`$d<%lO#{^=xY#UWrSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#o7^#o;'S#{;'S;=`$d<%lO#{^>o[#TWrSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#f7^#f#g?e#g#o7^#o;'S#{;'S;=`$d<%lO#{U?j[rSOt#{uw#{x!_#{!_!`8R!`#O#{#P#T#{#T#i7^#i#j;Y#j#o7^#o;'S#{;'S;=`$d<%lO#{U@gU!YQrSOt#{uw#{x#O#{#P;'S#{;'S;=`$d<%lO#{~AOO#d~",
+  tokenizers: [operatorTokenizer, 1, 2, 3, tokenizer, new LocalTokenGroup("[~RP!O!PU~ZO!z~~", 11)],
+  topRules: {"Program":[0,25]},
+  specialized: [{term: 20, get: (value: any, stack: any) => (specializeKeyword(value, stack) << 1), external: specializeKeyword},{term: 20, get: (value: keyof typeof spec_Identifier) => spec_Identifier[value] || -1}],
+  tokenPrec: 1562
 })
diff --git a/src/parser/tests/basics.test.ts b/src/parser/tests/basics.test.ts
index da6d4bb..86e4a97 100644
--- a/src/parser/tests/basics.test.ts
+++ b/src/parser/tests/basics.test.ts
@@ -532,6 +532,72 @@ describe('Assign', () => {
   })
 })
 
+describe('CompoundAssign', () => {
+  test('parses += operator', () => {
+    expect('x += 5').toMatchTree(`
+      CompoundAssign
+        AssignableIdentifier x
+        PlusEq +=
+        Number 5`)
+  })
+
+  test('parses -= operator', () => {
+    expect('count -= 1').toMatchTree(`
+      CompoundAssign
+        AssignableIdentifier count
+        MinusEq -=
+        Number 1`)
+  })
+
+  test('parses *= operator', () => {
+    expect('total *= 2').toMatchTree(`
+      CompoundAssign
+        AssignableIdentifier total
+        StarEq *=
+        Number 2`)
+  })
+
+  test('parses /= operator', () => {
+    expect('value /= 10').toMatchTree(`
+      CompoundAssign
+        AssignableIdentifier value
+        SlashEq /=
+        Number 10`)
+  })
+
+  test('parses %= operator', () => {
+    expect('remainder %= 3').toMatchTree(`
+      CompoundAssign
+        AssignableIdentifier remainder
+        ModuloEq %=
+        Number 3`)
+  })
+
+  test('parses compound assignment with expression', () => {
+    expect('x += 1 + 2').toMatchTree(`
+      CompoundAssign
+        AssignableIdentifier x
+        PlusEq +=
+        BinOp
+          Number 1
+          Plus +
+          Number 2`)
+  })
+
+  test('parses compound assignment with function call', () => {
+    expect('total += add 5 3').toMatchTree(`
+      CompoundAssign
+        AssignableIdentifier total
+        PlusEq +=
+        FunctionCall
+          Identifier add
+          PositionalArg
+            Number 5
+          PositionalArg
+            Number 3`)
+  })
+})
+
 describe('DotGet whitespace sensitivity', () => {
   test('no whitespace - DotGet works when identifier in scope', () => {
     expect('basename = 5; basename.prop').toMatchTree(`
diff --git a/src/parser/tokenizer.ts b/src/parser/tokenizer.ts
index e4fc895..cbaac67 100644
--- a/src/parser/tokenizer.ts
+++ b/src/parser/tokenizer.ts
@@ -184,6 +184,17 @@ const chooseIdentifierToken = (input: InputStream, stack: Stack): number => {
   }
 
   const nextCh = getFullCodePoint(input, peekPos)
+  const nextCh2 = getFullCodePoint(input, peekPos + 1)
+
+  // Check for compound assignment operators: +=, -=, *=, /=, %=
+  if ([43/* + */, 45/* - */, 42/* * */, 47/* / */, 37/* % */].includes(nextCh) && nextCh2 === 61/* = */) {
+    // Found compound operator, check if it's followed by whitespace
+    const charAfterOp = getFullCodePoint(input, peekPos + 2)
+    if (isWhiteSpace(charAfterOp) || charAfterOp === -1 /* EOF */) {
+      return AssignableIdentifier
+    }
+  }
+
   if (nextCh === 61 /* = */) {
     // Found '=', but check if it's followed by whitespace
     // If '=' is followed by non-whitespace (like '=cool*'), it won't be tokenized as Eq