diff --git a/l10n_es_aeat_mod303_extra_data/README.rst b/l10n_es_aeat_mod303_extra_data/README.rst
new file mode 100644
index 00000000000..0a9765d2ec4
--- /dev/null
+++ b/l10n_es_aeat_mod303_extra_data/README.rst
@@ -0,0 +1,99 @@
+=============================
+AEAT modelo 303 - Datos extra
+=============================
+
+.. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+   !! This file is generated by oca-gen-addon-readme !!
+   !! changes will be overwritten.                   !!
+   !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+
+.. |badge1| image:: https://img.shields.io/badge/maturity-Beta-yellow.png
+    :target: https://odoo-community.org/page/development-status
+    :alt: Beta
+.. |badge2| image:: https://img.shields.io/badge/licence-AGPL--3-blue.png
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+.. |badge3| image:: https://img.shields.io/badge/github-OCA%2Fl10n--spain-lightgray.png?logo=github
+    :target: https://github.com/OCA/l10n-spain/tree/12.0/l10n_es_aeat_mod303_extra_data
+    :alt: OCA/l10n-spain
+.. |badge4| image:: https://img.shields.io/badge/weblate-Translate%20me-F47D42.png
+    :target: https://translation.odoo-community.org/projects/l10n-spain-12-0/l10n-spain-12-0-l10n_es_aeat_mod303_extra_data
+    :alt: Translate me on Weblate
+.. |badge5| image:: https://img.shields.io/badge/runbot-Try%20me-875A7B.png
+    :target: https://runbot.odoo-community.org/runbot/189/12.0
+    :alt: Try me on Runbot
+
+|badge1| |badge2| |badge3| |badge4| |badge5| 
+
+Módulo que nos permite configurar cualquier cambio del plan contable en la
+version 12.0 de la localización española, ya que Odoo no permite modificaciones
+en versiones no mantenidas.
+
+**Table of contents**
+
+.. contents::
+   :local:
+
+Usage
+=====
+
+Instalar el módulo y ejecutar el actualizador del plan contable disponible en
+el módulo *account_chart_update*.
+
+Changelog
+=========
+
+12.0.1.0.0 (2022-07-20)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+* [NEW] Module added to v12. Añadido nuevo impuesto del 5% de las eléctricas.
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues <https://github.com/OCA/l10n-spain/issues>`_.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us smashing it by providing a detailed and welcomed
+`feedback <https://github.com/OCA/l10n-spain/issues/new?body=module:%20l10n_es_aeat_mod303_extra_data%0Aversion:%2012.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**>`_.
+
+Do not contact contributors directly about support or help with technical issues.
+
+Credits
+=======
+
+Authors
+~~~~~~~
+
+* Trey (www.trey.es)
+
+Contributors
+~~~~~~~~~~~~
+
+* `Trey Kilobytes de Soluciones SL <https://www.trey.es>`__:
+
+  * Vicent Cubells
+
+Maintainers
+~~~~~~~~~~~
+
+This module is maintained by the OCA.
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+.. |maintainer-cubells| image:: https://github.com/cubells.png?size=40px
+    :target: https://github.com/cubells
+    :alt: cubells
+
+Current `maintainer <https://odoo-community.org/page/maintainer-role>`__:
+
+|maintainer-cubells| 
+
+This module is part of the `OCA/l10n-spain <https://github.com/OCA/l10n-spain/tree/12.0/l10n_es_aeat_mod303_extra_data>`_ project on GitHub.
+
+You are welcome to contribute. To learn how please visit https://odoo-community.org/page/Contribute.
diff --git a/l10n_es_aeat_mod303_extra_data/__init__.py b/l10n_es_aeat_mod303_extra_data/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/l10n_es_aeat_mod303_extra_data/__manifest__.py b/l10n_es_aeat_mod303_extra_data/__manifest__.py
new file mode 100644
index 00000000000..823f6a5b46f
--- /dev/null
+++ b/l10n_es_aeat_mod303_extra_data/__manifest__.py
@@ -0,0 +1,21 @@
+# Copyright (C) 2022 Trey, Kilobytes de Soluciones - Vicent Cubells
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+{
+    "name": "AEAT modelo 303 - Datos extra",
+    "summary": "Módulo para incluir los impuestos extra en el modelo 303.",
+    "author": "Trey (www.trey.es), Odoo Community Association (OCA)",
+    "maintainers": [
+        "cubells",
+    ],
+    "website": "https://github.com/OCA/l10n-spain",
+    "license": "AGPL-3",
+    "category": "Accounting & Finance",
+    "version": "12.0.1.0.0",
+    "depends": [
+        "l10n_es_aeat_mod303",
+        "l10n_es_extra_data",
+    ],
+    "data": [
+        "data/2021-07/l10n_es_aeat_map_tax_line.xml",
+    ],
+}
diff --git a/l10n_es_aeat_mod303_extra_data/data/2021-07/l10n_es_aeat_map_tax_line.xml b/l10n_es_aeat_mod303_extra_data/data/2021-07/l10n_es_aeat_map_tax_line.xml
new file mode 100644
index 00000000000..3b4e0cf86f3
--- /dev/null
+++ b/l10n_es_aeat_mod303_extra_data/data/2021-07/l10n_es_aeat_map_tax_line.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<odoo>
+    <record id="l10n_es_aeat_mod303.aeat_mod303_map_line_28" model="l10n.es.aeat.map.tax.line">
+        <field name="tax_ids" eval="[(4, ref('l10n_es_extra_data.account_tax_template_p_iva5_sc'))]"/>
+    </record>
+    <record id="l10n_es_aeat_mod303.aeat_mod303_map_line_29" model="l10n.es.aeat.map.tax.line">
+        <field name="tax_ids" eval="[(4, ref('l10n_es_extra_data.account_tax_template_p_iva5_sc'))]"/>
+    </record>
+    <record id="l10n_es_aeat_mod303.aeat_mod303_map_line_40" model="l10n.es.aeat.map.tax.line">
+        <field name="tax_ids" eval="[(4, ref('l10n_es_extra_data.account_tax_template_p_iva5_sc'))]"/>
+    </record>
+    <record id="l10n_es_aeat_mod303.aeat_mod303_map_line_41" model="l10n.es.aeat.map.tax.line">
+        <field name="tax_ids" eval="[(4, ref('l10n_es_extra_data.account_tax_template_p_iva5_sc'))]"/>
+    </record>
+</odoo>
diff --git a/l10n_es_aeat_mod303_extra_data/readme/CONTRIBUTORS.rst b/l10n_es_aeat_mod303_extra_data/readme/CONTRIBUTORS.rst
new file mode 100644
index 00000000000..8c5b2452471
--- /dev/null
+++ b/l10n_es_aeat_mod303_extra_data/readme/CONTRIBUTORS.rst
@@ -0,0 +1,3 @@
+* `Trey Kilobytes de Soluciones SL <https://www.trey.es>`__:
+
+  * Vicent Cubells
diff --git a/l10n_es_aeat_mod303_extra_data/readme/DESCRIPTION.rst b/l10n_es_aeat_mod303_extra_data/readme/DESCRIPTION.rst
new file mode 100644
index 00000000000..dec8317c931
--- /dev/null
+++ b/l10n_es_aeat_mod303_extra_data/readme/DESCRIPTION.rst
@@ -0,0 +1,5 @@
+Módulo para la presentación del modelo 303 (IVA - Autodeclaración) de la
+Agencia Española de Administración Tributaria.
+
+En este módulo se añaden los nuevos impuestos que se han introducido en el
+módulo `l10n_es_extra_data`.
diff --git a/l10n_es_aeat_mod303_extra_data/readme/HISTORY.rst b/l10n_es_aeat_mod303_extra_data/readme/HISTORY.rst
new file mode 100644
index 00000000000..f0d570362e6
--- /dev/null
+++ b/l10n_es_aeat_mod303_extra_data/readme/HISTORY.rst
@@ -0,0 +1,4 @@
+12.0.1.0.0 (2022-07-21)
+~~~~~~~~~~~~~~~~~~~~~~~
+
+* [NEW] Module added to v12. Añadido nuevo impuesto del 5% de las eléctricas.
diff --git a/l10n_es_aeat_mod303_extra_data/static/description/index.html b/l10n_es_aeat_mod303_extra_data/static/description/index.html
new file mode 100644
index 00000000000..1a9ae852e0b
--- /dev/null
+++ b/l10n_es_aeat_mod303_extra_data/static/description/index.html
@@ -0,0 +1,423 @@
+<?xml version="1.0" encoding="utf-8" ?>
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+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
+<meta name="generator" content="Docutils: http://docutils.sourceforge.net/" />
+<title>AEAT modelo 303 - Datos extra</title>
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+<body>
+<div class="document" id="aeat-modelo-303-datos-extra">
+<h1 class="title">AEAT modelo 303 - Datos extra</h1>
+
+<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
+!! This file is generated by oca-gen-addon-readme !!
+!! changes will be overwritten.                   !!
+!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
+<p><a class="reference external" href="https://odoo-community.org/page/development-status"><img alt="Beta" src="https://img.shields.io/badge/maturity-Beta-yellow.png" /></a> <a class="reference external" href="http://www.gnu.org/licenses/agpl-3.0-standalone.html"><img alt="License: AGPL-3" src="https://img.shields.io/badge/licence-AGPL--3-blue.png" /></a> <a class="reference external" href="https://github.com/OCA/l10n-spain/tree/12.0/l10n_es_aeat_mod303_extra_data"><img alt="OCA/l10n-spain" src="https://img.shields.io/badge/github-OCA%2Fl10n--spain-lightgray.png?logo=github" /></a> <a class="reference external" href="https://translation.odoo-community.org/projects/l10n-spain-12-0/l10n-spain-12-0-l10n_es_aeat_mod303_extra_data"><img alt="Translate me on Weblate" src="https://img.shields.io/badge/weblate-Translate%20me-F47D42.png" /></a> <a class="reference external" href="https://runbot.odoo-community.org/runbot/189/12.0"><img alt="Try me on Runbot" src="https://img.shields.io/badge/runbot-Try%20me-875A7B.png" /></a></p>
+<p>Módulo que nos permite configurar cualquier cambio del plan contable en la
+version 12.0 de la localización española, ya que Odoo no permite modificaciones
+en versiones no mantenidas.</p>
+<p><strong>Table of contents</strong></p>
+<div class="contents local topic" id="contents">
+<ul class="simple">
+<li><a class="reference internal" href="#usage" id="id2">Usage</a></li>
+<li><a class="reference internal" href="#changelog" id="id3">Changelog</a><ul>
+<li><a class="reference internal" href="#id1" id="id4">12.0.1.0.0 (2022-07-20)</a></li>
+</ul>
+</li>
+<li><a class="reference internal" href="#bug-tracker" id="id5">Bug Tracker</a></li>
+<li><a class="reference internal" href="#credits" id="id6">Credits</a><ul>
+<li><a class="reference internal" href="#authors" id="id7">Authors</a></li>
+<li><a class="reference internal" href="#contributors" id="id8">Contributors</a></li>
+<li><a class="reference internal" href="#maintainers" id="id9">Maintainers</a></li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="usage">
+<h1><a class="toc-backref" href="#id2">Usage</a></h1>
+<p>Instalar el módulo y ejecutar el actualizador del plan contable disponible en
+el módulo <em>account_chart_update</em>.</p>
+</div>
+<div class="section" id="changelog">
+<h1><a class="toc-backref" href="#id3">Changelog</a></h1>
+<div class="section" id="id1">
+<h2><a class="toc-backref" href="#id4">12.0.1.0.0 (2022-07-20)</a></h2>
+<ul class="simple">
+<li>[NEW] Module added to v12. Añadido nuevo impuesto del 5% de las eléctricas.</li>
+</ul>
+</div>
+</div>
+<div class="section" id="bug-tracker">
+<h1><a class="toc-backref" href="#id5">Bug Tracker</a></h1>
+<p>Bugs are tracked on <a class="reference external" href="https://github.com/OCA/l10n-spain/issues">GitHub Issues</a>.
+In case of trouble, please check there if your issue has already been reported.
+If you spotted it first, help us smashing it by providing a detailed and welcomed
+<a class="reference external" href="https://github.com/OCA/l10n-spain/issues/new?body=module:%20l10n_es_aeat_mod303_extra_data%0Aversion:%2012.0%0A%0A**Steps%20to%20reproduce**%0A-%20...%0A%0A**Current%20behavior**%0A%0A**Expected%20behavior**">feedback</a>.</p>
+<p>Do not contact contributors directly about support or help with technical issues.</p>
+</div>
+<div class="section" id="credits">
+<h1><a class="toc-backref" href="#id6">Credits</a></h1>
+<div class="section" id="authors">
+<h2><a class="toc-backref" href="#id7">Authors</a></h2>
+<ul class="simple">
+<li>Trey (www.trey.es)</li>
+</ul>
+</div>
+<div class="section" id="contributors">
+<h2><a class="toc-backref" href="#id8">Contributors</a></h2>
+<ul class="simple">
+<li><a class="reference external" href="https://www.trey.es">Trey Kilobytes de Soluciones SL</a>:<ul>
+<li>Vicent Cubells</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="section" id="maintainers">
+<h2><a class="toc-backref" href="#id9">Maintainers</a></h2>
+<p>This module is maintained by the OCA.</p>
+<a class="reference external image-reference" href="https://odoo-community.org"><img alt="Odoo Community Association" src="https://odoo-community.org/logo.png" /></a>
+<p>OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.</p>
+<p>Current <a class="reference external" href="https://odoo-community.org/page/maintainer-role">maintainer</a>:</p>
+<p><a class="reference external" href="https://github.com/cubells"><img alt="cubells" src="https://github.com/cubells.png?size=40px" /></a></p>
+<p>This module is part of the <a class="reference external" href="https://github.com/OCA/l10n-spain/tree/12.0/l10n_es_aeat_mod303_extra_data">OCA/l10n-spain</a> project on GitHub.</p>
+<p>You are welcome to contribute. To learn how please visit <a class="reference external" href="https://odoo-community.org/page/Contribute">https://odoo-community.org/page/Contribute</a>.</p>
+</div>
+</div>
+</div>
+</body>
+</html>