diff --git a/packages/xml/src/Xml/Templates/invoice2.1.xml.twig b/packages/xml/src/Xml/Templates/invoice2.1.xml.twig
index 72c66b74..ef91f768 100644
--- a/packages/xml/src/Xml/Templates/invoice2.1.xml.twig
+++ b/packages/xml/src/Xml/Templates/invoice2.1.xml.twig
@@ -324,7 +324,7 @@
         {% if doc.mtoOperInafectas is not null %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperInafectas|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9998</cbc:ID>
@@ -337,7 +337,7 @@
         {% if doc.mtoOperExoneradas is not null %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperExoneradas|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9997</cbc:ID>
@@ -363,7 +363,7 @@
         {% if doc.mtoOperExportacion is not null %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperExportacion|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9995</cbc:ID>
diff --git a/packages/xml/src/Xml/Templates/notacr2.1.xml.twig b/packages/xml/src/Xml/Templates/notacr2.1.xml.twig
index 7492a54f..53db4dba 100644
--- a/packages/xml/src/Xml/Templates/notacr2.1.xml.twig
+++ b/packages/xml/src/Xml/Templates/notacr2.1.xml.twig
@@ -189,7 +189,7 @@
         {% if doc.mtoOperInafectas %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperInafectas|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9998</cbc:ID>
@@ -202,7 +202,7 @@
         {% if doc.mtoOperExoneradas %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperExoneradas|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9997</cbc:ID>
@@ -228,7 +228,7 @@
         {% if doc.mtoOperExportacion %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperExportacion|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9995</cbc:ID>
diff --git a/packages/xml/src/Xml/Templates/notadb2.1.xml.twig b/packages/xml/src/Xml/Templates/notadb2.1.xml.twig
index ae0eb113..ee39389e 100644
--- a/packages/xml/src/Xml/Templates/notadb2.1.xml.twig
+++ b/packages/xml/src/Xml/Templates/notadb2.1.xml.twig
@@ -170,7 +170,7 @@
         {% if doc.mtoOperInafectas %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperInafectas|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9998</cbc:ID>
@@ -183,7 +183,7 @@
         {% if doc.mtoOperExoneradas %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperExoneradas|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9997</cbc:ID>
@@ -209,7 +209,7 @@
         {% if doc.mtoOperExportacion %}
             <cac:TaxSubtotal>
                 <cbc:TaxableAmount currencyID="{{ doc.tipoMoneda }}">{{ doc.mtoOperExportacion|n_format }}</cbc:TaxableAmount>
-                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0</cbc:TaxAmount>
+                <cbc:TaxAmount currencyID="{{ doc.tipoMoneda }}">0.00</cbc:TaxAmount>
                 <cac:TaxCategory>
                     <cac:TaxScheme>
                         <cbc:ID>9995</cbc:ID>
diff --git a/packages/xml/tests/Xml/Builder/FeBuilderTrait.php b/packages/xml/tests/Xml/Builder/FeBuilderTrait.php
index 11d6557f..0bf81c71 100644
--- a/packages/xml/tests/Xml/Builder/FeBuilderTrait.php
+++ b/packages/xml/tests/Xml/Builder/FeBuilderTrait.php
@@ -59,4 +59,26 @@ private function build(DocumentInterface $document): ?string
 
         return $generator->build($document);
     }
+
+    /**
+     * Verifica que el TaxAmount de los tributos sin monto (EXP, EXO, INA) tenga formato n(12,2).
+     *
+     * @param string $xml
+     * @param int $expectedCount
+     */
+    private function assertZeroTaxAmountFormat(string $xml, int $expectedCount): void
+    {
+        $doc = new \DOMDocument();
+        $doc->loadXML($xml);
+        $xpath = new \DOMXPath($doc);
+        $xpath->registerNamespace('cac', 'urn:oasis:names:specification:ubl:schema:xsd:CommonAggregateComponents-2');
+        $xpath->registerNamespace('cbc', 'urn:oasis:names:specification:ubl:schema:xsd:CommonBasicComponents-2');
+
+        $nodes = $xpath->query('/*/cac:TaxTotal/cac:TaxSubtotal[cac:TaxCategory/cac:TaxScheme/cbc:ID[.="9995" or .="9997" or .="9998"]]/cbc:TaxAmount');
+
+        $this->assertSame($expectedCount, $nodes->length);
+        foreach ($nodes as $node) {
+            $this->assertSame('0.00', $node->nodeValue);
+        }
+    }
 }
diff --git a/packages/xml/tests/Xml/Builder/v21/FeInvoiceBuilderTest.php b/packages/xml/tests/Xml/Builder/v21/FeInvoiceBuilderTest.php
index 96e22a7a..0afc1afc 100644
--- a/packages/xml/tests/Xml/Builder/v21/FeInvoiceBuilderTest.php
+++ b/packages/xml/tests/Xml/Builder/v21/FeInvoiceBuilderTest.php
@@ -36,6 +36,7 @@ public function testGenerate()
 //        file_put_contents('x.xml', $xml);
         $this->assertNotEmpty($xml);
         $this->assertSchema($xml);
+        $this->assertZeroTaxAmountFormat($xml, 3);
     }
 
     /**
diff --git a/packages/xml/tests/Xml/Builder/v21/FeNoteBuilderTest.php b/packages/xml/tests/Xml/Builder/v21/FeNoteBuilderTest.php
index 10b5579d..95de118d 100644
--- a/packages/xml/tests/Xml/Builder/v21/FeNoteBuilderTest.php
+++ b/packages/xml/tests/Xml/Builder/v21/FeNoteBuilderTest.php
@@ -29,13 +29,16 @@ public function testCreateXmlCreditNote()
     {
         /**@var $note Note*/
         $note = $this->createDocument(NoteStore::class);
-        $note->setUblVersion('2.1');
+        $note->setUblVersion('2.1')
+            ->setMtoOperExoneradas(100)
+            ->setMtoOperInafectas(50);
 
         $xml = $this->build($note);
 
 //        file_put_contents('notecr.xml', $xml);
         $this->assertNotEmpty($xml);
         $this->assertSchema($xml);
+        $this->assertZeroTaxAmountFormat($xml, 2);
     }
 
     public function testCreateXmlDebitNote()
@@ -43,12 +46,15 @@ public function testCreateXmlDebitNote()
         /**@var $note Note*/
         $note = $this->createDocument(NoteStore::class);
         $note->setTipoDoc('08');
-        $note->setUblVersion('2.1');
+        $note->setUblVersion('2.1')
+            ->setMtoOperExoneradas(100)
+            ->setMtoOperInafectas(50);
 
         $xml = $this->build($note);
 
 //        file_put_contents('notedb.xml', $xml);
         $this->assertNotEmpty($xml);
         $this->assertSchema($xml);
+        $this->assertZeroTaxAmountFormat($xml, 2);
     }
 }
\ No newline at end of file