diff --git a/admin/setup_mvp.php b/admin/setup_mvp.php
index 52484c8..c65f655 100644
--- a/admin/setup_mvp.php
+++ b/admin/setup_mvp.php
@@ -259,9 +259,91 @@ if (empty($mappings_by_line)) {
     }
 }
 
+// Template Management Section
+print '<div class="fichecenter">';
+print '<div class="fichehalfleft">';
+
+// Load PDF class
+require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva_pdf.class.php';
+$pdf_generator = new DeclarationTVA_PDF($db);
+
+// Handle template upload
+if ($action == 'upload_template') {
+    $uploaded_file = $_FILES['template_file'];
+    if ($pdf_generator->uploadCustomTemplate($uploaded_file)) {
+        setEventMessages($langs->trans("TemplateUploaded"), null, 'mesgs');
+    } else {
+        setEventMessages($pdf_generator->error, null, 'errors');
+    }
+}
+
+// Handle template reset
+if ($action == 'reset_template') {
+    if ($pdf_generator->resetToDefaultTemplate()) {
+        setEventMessages($langs->trans("TemplateReset"), null, 'mesgs');
+    } else {
+        setEventMessages($langs->trans("TemplateResetFailed"), null, 'errors');
+    }
+}
+
+// Get template information
+$template_info = $pdf_generator->getTemplateInfo();
+
+print '<form name="template_form" method="POST" enctype="multipart/form-data">';
+print '<input type="hidden" name="token" value="' . newToken() . '">';
+print '<input type="hidden" name="action" value="upload_template">';
+
+print '<table class="noborder centpercent">';
+print '<tr class="liste_titre">';
+print '<td colspan="2"><strong>Gestion des modèles PDF CA-3</strong></td>';
+print '</tr>';
+
+print '<tr>';
+print '<td><strong>Modèle actuel</strong></td>';
+print '<td>';
+if ($template_info['custom_template']) {
+    print '<span class="badge badge-status4">Modèle personnalisé</span>';
+} else {
+    print '<span class="badge badge-status1">Modèle officiel</span>';
+}
+print '</td>';
+print '</tr>';
+
+print '<tr>';
+print '<td><strong>Version officielle</strong></td>';
+print '<td>' . $template_info['official_number'] . '</td>';
+print '</tr>';
+
+print '<tr>';
+print '<td><strong>Nouveau modèle</strong></td>';
+print '<td>';
+print '<input type="file" name="template_file" accept=".pdf" required>';
+print '<br><small>Format PDF uniquement, taille max 10MB</small>';
+print '</td>';
+print '</tr>';
+
+print '<tr>';
+print '<td colspan="2" class="center">';
+print '<input type="submit" class="button" value="Télécharger le modèle">';
+print '</td>';
+print '</tr>';
+
+if ($template_info['custom_template']) {
+    print '<tr>';
+    print '<td colspan="2" class="center">';
+    print '<a href="' . $_SERVER['PHP_SELF'] . '?action=reset_template&token=' . newToken() . '" class="button button-delete">Revenir au modèle officiel</a>';
+    print '</td>';
+    print '</tr>';
+}
+
+print '</table>';
+print '</form>';
+
+print '</div>';
+print '</div>';
+
 print '</div>';
 
 // Print footer
 llxFooter();
-?>
 ?>
\ No newline at end of file
diff --git a/core/class/declarationtva_pdf.class.php b/core/class/declarationtva_pdf.class.php
new file mode 100644
index 0000000..61be6f8
--- /dev/null
+++ b/core/class/declarationtva_pdf.class.php
@@ -0,0 +1,334 @@
+<?php
+/* Copyright (C) 2025		Frank Cools
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * 	\file       core/class/declarationtva_pdf.class.php
+ *  \ingroup    declarationtva
+ *  \brief      PDF generation for CA-3 declarations
+ */
+
+require_once DOL_DOCUMENT_ROOT.'/core/lib/pdf.lib.php';
+require_once DOL_DOCUMENT_ROOT.'/core/lib/company.lib.php';
+require_once DOL_DOCUMENT_ROOT.'/core/lib/date.lib.php';
+
+/**
+ *  Class to generate CA-3 declaration PDF
+ */
+class DeclarationTVA_PDF
+{
+    /**
+     * @var DoliDB Database handler
+     */
+    public $db;
+
+    /**
+     * @var string Error code (or message)
+     */
+    public $error = '';
+
+    /**
+     * @var string[] Several error codes (or messages)
+     */
+    public $errors = array();
+
+    /**
+     * @var int Entity
+     */
+    public $entity;
+
+    /**
+     * @var string Template path
+     */
+    public $template_path;
+
+    /**
+     * @var string Template version
+     */
+    public $template_version = '30';
+
+    /**
+     * @var string Template document number
+     */
+    public $template_document = '10963';
+
+    /**
+     * Constructor
+     *
+     * @param DoliDB $db Database handler
+     */
+    public function __construct($db)
+    {
+        $this->db = $db;
+        $this->entity = (int) $conf->entity;
+        $this->template_path = DOL_DOCUMENT_ROOT.'/custom/declarationtva/templates/declarationtva/';
+    }
+
+    /**
+     * Generate CA-3 declaration PDF
+     *
+     * @param int $declaration_id Declaration ID
+     * @param string $outputlangs Output language
+     * @return string|false PDF file path or false on error
+     */
+    public function generateCA3PDF($declaration_id, $outputlangs = '')
+    {
+        global $conf, $langs, $user;
+
+        // Load declaration data
+        $declaration = new DeclarationTVA($this->db);
+        $result = $declaration->fetch($declaration_id);
+        if ($result <= 0) {
+            $this->error = 'Declaration not found';
+            return false;
+        }
+
+        // Get CA-3 line data
+        $ca3_data = $declaration->getCA3Lines($declaration_id);
+        if (empty($ca3_data)) {
+            $this->error = 'No CA-3 data found';
+            return false;
+        }
+
+        // Get company information
+        $company = new Societe($this->db);
+        $company->fetch($conf->entity);
+
+        // Generate PDF filename
+        $filename = 'CA3_' . $declaration->declaration_number . '_' . date('Y-m-d') . '.pdf';
+        $filepath = DOL_DATA_ROOT . '/declarationtva/' . $filename;
+
+        // Ensure directory exists
+        if (!is_dir(DOL_DATA_ROOT . '/declarationtva/')) {
+            dol_mkdir(DOL_DATA_ROOT . '/declarationtva/');
+        }
+
+        // Check if we have a custom template
+        $template_file = $this->getTemplatePath();
+        if (!$template_file) {
+            $this->error = 'CA-3 template not found';
+            return false;
+        }
+
+        // Generate PDF using FPDI or similar library
+        $result = $this->fillPDFTemplate($template_file, $filepath, $declaration, $ca3_data, $company);
+        
+        if ($result) {
+            return $filepath;
+        } else {
+            return false;
+        }
+    }
+
+    /**
+     * Get the template file path (custom or default)
+     *
+     * @return string|false Template file path or false if not found
+     */
+    private function getTemplatePath()
+    {
+        // Check for custom template first
+        $custom_template = $this->template_path . 'ca3_custom_template.pdf';
+        if (file_exists($custom_template)) {
+            return $custom_template;
+        }
+
+        // Fall back to default template
+        $default_template = $this->template_path . 'ca3_official_template.pdf';
+        if (file_exists($default_template)) {
+            return $default_template;
+        }
+
+        return false;
+    }
+
+    /**
+     * Fill PDF template with declaration data
+     *
+     * @param string $template_path Template file path
+     * @param string $output_path Output file path
+     * @param DeclarationTVA $declaration Declaration object
+     * @param array $ca3_data CA-3 line data
+     * @param Societe $company Company object
+     * @return bool Success
+     */
+    private function fillPDFTemplate($template_path, $output_path, $declaration, $ca3_data, $company)
+    {
+        // This is a placeholder - we'll need to implement actual PDF filling
+        // For now, we'll create a simple PDF with the data
+        
+        try {
+            // Create a new PDF document
+            $pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
+            
+            // Set document information
+            $pdf->SetCreator('DeclarationTVA Module');
+            $pdf->SetAuthor($company->name);
+            $pdf->SetTitle('CA-3 Declaration ' . $declaration->declaration_number);
+            $pdf->SetSubject('French VAT Declaration');
+            
+            // Set margins
+            $pdf->SetMargins(15, 15, 15);
+            $pdf->SetHeaderMargin(5);
+            $pdf->SetFooterMargin(10);
+            
+            // Add a page
+            $pdf->AddPage();
+            
+            // Add title
+            $pdf->SetFont('helvetica', 'B', 16);
+            $pdf->Cell(0, 10, 'Déclaration TVA CA-3', 0, 1, 'C');
+            $pdf->Ln(10);
+            
+            // Add declaration information
+            $pdf->SetFont('helvetica', '', 12);
+            $pdf->Cell(0, 8, 'Numéro de déclaration: ' . $declaration->declaration_number, 0, 1);
+            $pdf->Cell(0, 8, 'Période: ' . dol_print_date($declaration->start_date, 'day') . ' - ' . dol_print_date($declaration->end_date, 'day'), 0, 1);
+            $pdf->Cell(0, 8, 'Statut: ' . $declaration->status, 0, 1);
+            $pdf->Ln(10);
+            
+            // Add CA-3 sections
+            $this->addCA3Section($pdf, 'A. Opérations imposables', $ca3_data, array('A1', 'A2', 'A3', 'A4', 'A5'));
+            $this->addCA3Section($pdf, 'B. TVA due', $ca3_data, array('08', '09', '9B', '17'));
+            $this->addCA3Section($pdf, 'C. TVA déductible', $ca3_data, array('20', '21', '22'));
+            $this->addCA3Section($pdf, 'D. Résultat', $ca3_data, array('25', '26', 'TD', '28', '29'));
+            
+            // Add totals
+            $pdf->Ln(10);
+            $pdf->SetFont('helvetica', 'B', 12);
+            $pdf->Cell(0, 8, 'TOTAL TVA COLLECTÉE: ' . price($declaration->total_vat_collected, 0, '', 1, 0), 0, 1);
+            $pdf->Cell(0, 8, 'TOTAL TVA DÉDUCTIBLE: ' . price($declaration->total_vat_deductible, 0, '', 1, 0), 0, 1);
+            $pdf->Cell(0, 8, 'TVA NETTE DUE: ' . price($declaration->net_vat_due, 0, '', 1, 0), 0, 1);
+            
+            if ($declaration->vat_credit > 0) {
+                $pdf->Cell(0, 8, 'CRÉDIT DE TVA: ' . price($declaration->vat_credit, 0, '', 1, 0), 0, 1);
+            }
+            
+            // Output PDF
+            $pdf->Output($output_path, 'F');
+            
+            return true;
+            
+        } catch (Exception $e) {
+            $this->error = 'PDF generation failed: ' . $e->getMessage();
+            return false;
+        }
+    }
+
+    /**
+     * Add CA-3 section to PDF
+     *
+     * @param TCPDF $pdf PDF object
+     * @param string $section_title Section title
+     * @param array $ca3_data CA-3 data
+     * @param array $lines Lines to include
+     */
+    private function addCA3Section($pdf, $section_title, $ca3_data, $lines)
+    {
+        $pdf->SetFont('helvetica', 'B', 12);
+        $pdf->Cell(0, 8, $section_title, 0, 1);
+        
+        $pdf->SetFont('helvetica', '', 10);
+        foreach ($lines as $line) {
+            if (isset($ca3_data[$line])) {
+                $data = $ca3_data[$line];
+                $amount = isset($data['vat_amount']) ? $data['vat_amount'] : 0;
+                $pdf->Cell(20, 6, $line, 1, 0, 'C');
+                $pdf->Cell(100, 6, $data['line_label'], 1, 0);
+                $pdf->Cell(30, 6, price($amount, 0, '', 1, 0), 1, 1, 'R');
+            }
+        }
+        $pdf->Ln(5);
+    }
+
+    /**
+     * Upload custom template
+     *
+     * @param array $file Uploaded file array
+     * @return bool Success
+     */
+    public function uploadCustomTemplate($file)
+    {
+        if (!isset($file['tmp_name']) || !is_uploaded_file($file['tmp_name'])) {
+            $this->error = 'No file uploaded';
+            return false;
+        }
+
+        // Validate file type
+        $file_info = pathinfo($file['name']);
+        if (strtolower($file_info['extension']) !== 'pdf') {
+            $this->error = 'Only PDF files are allowed';
+            return false;
+        }
+
+        // Validate file size (max 10MB)
+        if ($file['size'] > 10 * 1024 * 1024) {
+            $this->error = 'File too large (max 10MB)';
+            return false;
+        }
+
+        // Move uploaded file
+        $target_path = $this->template_path . 'ca3_custom_template.pdf';
+        if (!is_dir($this->template_path)) {
+            dol_mkdir($this->template_path);
+        }
+
+        if (move_uploaded_file($file['tmp_name'], $target_path)) {
+            return true;
+        } else {
+            $this->error = 'Failed to save template';
+            return false;
+        }
+    }
+
+    /**
+     * Get template information
+     *
+     * @return array Template information
+     */
+    public function getTemplateInfo()
+    {
+        $info = array(
+            'version' => $this->template_version,
+            'document' => $this->template_document,
+            'official_number' => $this->template_document . '*' . $this->template_version,
+            'custom_template' => false,
+            'template_path' => ''
+        );
+
+        $custom_template = $this->template_path . 'ca3_custom_template.pdf';
+        if (file_exists($custom_template)) {
+            $info['custom_template'] = true;
+            $info['template_path'] = $custom_template;
+        }
+
+        return $info;
+    }
+
+    /**
+     * Reset to default template
+     *
+     * @return bool Success
+     */
+    public function resetToDefaultTemplate()
+    {
+        $custom_template = $this->template_path . 'ca3_custom_template.pdf';
+        if (file_exists($custom_template)) {
+            return unlink($custom_template);
+        }
+        return true;
+    }
+}
diff --git a/declarationtva_view.php b/declarationtva_view.php
index 281563f..9f638d2 100644
--- a/declarationtva_view.php
+++ b/declarationtva_view.php
@@ -54,6 +54,28 @@ if ($action == 'recalculate' && $token) {
     }
 }
 
+if ($action == 'export_pdf') {
+    // Load PDF generator
+    require_once DOL_DOCUMENT_ROOT . '/custom/declarationtva/core/class/declarationtva_pdf.class.php';
+    $pdf_generator = new DeclarationTVA_PDF($db);
+    
+    // Generate PDF
+    $pdf_path = $pdf_generator->generateCA3PDF($id);
+    
+    if ($pdf_path && file_exists($pdf_path)) {
+        // Set headers for PDF download
+        header('Content-Type: application/pdf');
+        header('Content-Disposition: attachment; filename="CA3_' . $declarationtva->declaration_number . '.pdf"');
+        header('Content-Length: ' . filesize($pdf_path));
+        
+        // Output PDF
+        readfile($pdf_path);
+        exit;
+    } else {
+        setEventMessages($pdf_generator->error ?: $langs->trans("ErrorGeneratingPDF"), null, 'errors');
+    }
+}
+
 // Fetch declaration
 if ($declarationtva->fetch($id) < 0) {
     setEventMessages($langs->trans("DeclarationNotFound"), null, 'errors');
@@ -357,6 +379,9 @@ print '<div class="center">';
 // Recalculate button (always available)
 print '<a href="' . $_SERVER['PHP_SELF'] . '?id=' . $id . '&action=recalculate&token=' . newToken() . '" class="butAction">' . $langs->trans("Recalculate") . '</a> ';
 
+// PDF Export button (always available)
+print '<a href="' . $_SERVER['PHP_SELF'] . '?id=' . $id . '&action=export_pdf" class="butAction">' . $langs->trans("ExportPDF") . '</a> ';
+
 if ($declarationtva->status == 'draft') {
     print '<a href="' . $_SERVER['PHP_SELF'] . '?id=' . $id . '&action=validate" class="butAction">' . $langs->trans("Validate") . '</a> ';
 } elseif ($declarationtva->status == 'validated') {
diff --git a/langs/en_US/declarationtva.lang b/langs/en_US/declarationtva.lang
index 6cec5eb..60d045e 100644
--- a/langs/en_US/declarationtva.lang
+++ b/langs/en_US/declarationtva.lang
@@ -466,3 +466,8 @@ VATAccounts = VAT Accounts
 SubtotalBaseAccounts = Subtotal Base Accounts
 SubtotalVATAccounts = Subtotal VAT Accounts
 GrandTotal = Grand Total
+ExportPDF = Export PDF
+TemplateUploaded = PDF template uploaded successfully
+TemplateReset = Reset to official template
+TemplateResetFailed = Error resetting to official template
+ErrorGeneratingPDF = Error generating PDF
diff --git a/langs/fr_FR/declarationtva.lang b/langs/fr_FR/declarationtva.lang
index e451294..67c594d 100644
--- a/langs/fr_FR/declarationtva.lang
+++ b/langs/fr_FR/declarationtva.lang
@@ -455,3 +455,8 @@ VATAccounts = Comptes de TVA
 SubtotalBaseAccounts = Sous-total comptes de base
 SubtotalVATAccounts = Sous-total comptes de TVA
 GrandTotal = Total général
+ExportPDF = Exporter PDF
+TemplateUploaded = Modèle PDF téléchargé avec succès
+TemplateReset = Retour au modèle officiel
+TemplateResetFailed = Erreur lors du retour au modèle officiel
+ErrorGeneratingPDF = Erreur lors de la génération du PDF
diff --git a/templates/declarationtva/README.md b/templates/declarationtva/README.md
new file mode 100644
index 0000000..d017e04
--- /dev/null
+++ b/templates/declarationtva/README.md
@@ -0,0 +1,26 @@
+# CA-3 Template Directory
+
+This directory contains the CA-3 PDF templates for the DeclarationTVA module.
+
+## Template Files
+
+- `ca3_official_template.pdf` - Official CA-3 template (version 30, document 10963)
+- `ca3_custom_template.pdf` - Custom template uploaded by user (if any)
+
+## Template Information
+
+- **Official Number**: 10963*30
+- **Version**: 30
+- **Document**: 10963
+- **Source**: French Tax Authorities
+
+## Template Management
+
+The module will:
+1. Use the custom template if available (`ca3_custom_template.pdf`)
+2. Fall back to the official template (`ca3_official_template.pdf`)
+3. Allow users to upload updated templates via the configuration page
+
+## File Permissions
+
+Ensure the web server has write permissions to this directory for template uploads.