diff --git a/CHANGELOG b/CHANGELOG
index a908678d34..b463934bd3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+* Add party tax identifier on invoice
+
 Version 4.4.0 - 2017-05-01
 * Bug fixes (see mercurial logs for details)
 * Use Match pattern for invoice sequences
diff --git a/doc/index.rst b/doc/index.rst
index 12d2148a2f..d8a4ec55bc 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -18,6 +18,7 @@ There are 4 types of invoice: *Invoice*, *Supplier Invoice*, *Credit Note* and
 - Reference: The optional external reference of the invoice.
 - Party: The party for which or from which the invoice is issued.
 - Invoice Address: The address of the party.
+- Party Tax Identifier: The tax identifier of the party.
 - Description: An optional description of the invoice.
 - Comment: A text fields to add custom comments.
 - Invoice Date: The date of the invoice. It is set on posting the invoice if not.
diff --git a/invoice.fodt b/invoice.fodt
index bac7e5dd25..21b03e8928 100644
--- a/invoice.fodt
+++ b/invoice.fodt
@@ -4,9 +4,9 @@
  <office:meta><meta:generator>LibreOffice/5.2.7.2$Linux_X86_64 LibreOffice_project/20m0$Build-2</meta:generator><meta:creation-date>2012-11-15T15:00:35</meta:creation-date><meta:editing-cycles>1</meta:editing-cycles><meta:editing-duration>P0D</meta:editing-duration><meta:document-statistic meta:table-count="5" meta:image-count="0" meta:object-count="0" meta:page-count="6" meta:paragraph-count="108" meta:word-count="295" meta:character-count="3445" meta:non-whitespace-character-count="3258"/><meta:user-defined meta:name="Info 1"/><meta:user-defined meta:name="Info 2"/><meta:user-defined meta:name="Info 3"/><meta:user-defined meta:name="Info 4"/></office:meta>
  <office:settings>
   <config:config-item-set config:name="ooo:view-settings">
-   <config:config-item config:name="ViewAreaTop" config:type="long">0</config:config-item>
+   <config:config-item config:name="ViewAreaTop" config:type="long">1880</config:config-item>
    <config:config-item config:name="ViewAreaLeft" config:type="long">0</config:config-item>
-   <config:config-item config:name="ViewAreaWidth" config:type="long">48623</config:config-item>
+   <config:config-item config:name="ViewAreaWidth" config:type="long">48622</config:config-item>
    <config:config-item config:name="ViewAreaHeight" config:type="long">23834</config:config-item>
    <config:config-item config:name="ShowRedlineChanges" config:type="boolean">true</config:config-item>
    <config:config-item config:name="InBrowseMode" config:type="boolean">false</config:config-item>
@@ -14,11 +14,11 @@
     <config:config-item-map-entry>
      <config:config-item config:name="ViewId" config:type="string">view2</config:config-item>
      <config:config-item config:name="ViewLeft" config:type="long">26797</config:config-item>
-     <config:config-item config:name="ViewTop" config:type="long">5313</config:config-item>
+     <config:config-item config:name="ViewTop" config:type="long">11642</config:config-item>
      <config:config-item config:name="VisibleLeft" config:type="long">0</config:config-item>
-     <config:config-item config:name="VisibleTop" config:type="long">0</config:config-item>
-     <config:config-item config:name="VisibleRight" config:type="long">48622</config:config-item>
-     <config:config-item config:name="VisibleBottom" config:type="long">23832</config:config-item>
+     <config:config-item config:name="VisibleTop" config:type="long">1880</config:config-item>
+     <config:config-item config:name="VisibleRight" config:type="long">48620</config:config-item>
+     <config:config-item config:name="VisibleBottom" config:type="long">25712</config:config-item>
      <config:config-item config:name="ZoomType" config:type="short">0</config:config-item>
      <config:config-item config:name="ViewLayoutColumns" config:type="short">1</config:config-item>
      <config:config-item config:name="ViewLayoutBookMode" config:type="boolean">false</config:config-item>
@@ -69,7 +69,7 @@
    <config:config-item config:name="InvertBorderSpacing" config:type="boolean">false</config:config-item>
    <config:config-item config:name="SaveGlobalDocumentLinks" config:type="boolean">false</config:config-item>
    <config:config-item config:name="TabsRelativeToIndent" config:type="boolean">true</config:config-item>
-   <config:config-item config:name="Rsid" config:type="int">2153615</config:config-item>
+   <config:config-item config:name="Rsid" config:type="int">2254801</config:config-item>
    <config:config-item config:name="PrintProspectRTL" config:type="boolean">false</config:config-item>
    <config:config-item config:name="PrintEmptyPages" config:type="boolean">true</config:config-item>
    <config:config-item config:name="ApplyUserData" config:type="boolean">false</config:config-item>
@@ -541,7 +541,7 @@
   </style:style>
   <style:style style:name="P26" style:family="paragraph" style:parent-style-name="Standard">
    <style:paragraph-properties fo:margin-left="4.4409in" fo:margin-right="0in" fo:text-indent="0in" style:auto-text-indent="false" fo:break-before="page"/>
-   <style:text-properties officeooo:paragraph-rsid="0020411c"/>
+   <style:text-properties style:font-name="Liberation Sans1" officeooo:paragraph-rsid="0020411c"/>
   </style:style>
   <style:style style:name="T1" style:family="text">
    <style:text-properties officeooo:rsid="000dd611"/>
@@ -592,13 +592,13 @@
     <text:sequence-decl text:display-outline-level="0" text:name="Text"/>
     <text:sequence-decl text:display-outline-level="0" text:name="Drawing"/>
    </text:sequence-decls>
-   <text:p text:style-name="P24"><text:span text:style-name="T3"><text:placeholder text:placeholder-type="text">&lt;replace text:p=&quot;set_lang(invoice.party.lang and invoice.party.lang.code or &apos;en&apos;)&quot;&gt;</text:placeholder></text:span></text:p>
+   <text:p text:style-name="P26"><text:placeholder text:placeholder-type="text">&lt;replace text:p=&quot;set_lang(invoice.party.lang and invoice.party.lang.code or &apos;en&apos;)&quot;&gt;</text:placeholder></text:p>
    <text:p text:style-name="P20"><text:placeholder text:placeholder-type="text">&lt;replace text:p=&quot;invoice.set_lang(invoice.party.lang and invoice.party.lang.code or &apos;en&apos;)&quot;&gt;</text:placeholder></text:p>
    <text:p text:style-name="P20"><text:placeholder text:placeholder-type="text">&lt;for each=&quot;line in invoice.invoice_address.full_address.split(&apos;\n&apos;)&quot;&gt;</text:placeholder></text:p>
    <text:p text:style-name="P19"><text:placeholder text:placeholder-type="text">&lt;line&gt;</text:placeholder></text:p>
    <text:p text:style-name="P19"><text:placeholder text:placeholder-type="text">&lt;/for&gt;</text:placeholder></text:p>
-   <text:p text:style-name="P19"><text:placeholder text:placeholder-type="text">&lt;if test=&quot;invoice.party.tax_identifier&quot;&gt;</text:placeholder></text:p>
-   <text:p text:style-name="P19"><text:placeholder text:placeholder-type="text">&lt;invoice.party.tax_identifier.type_string&gt;</text:placeholder>: <text:placeholder text:placeholder-type="text">&lt;invoice.party.tax_identifier.code&gt;</text:placeholder></text:p>
+   <text:p text:style-name="P19"><text:placeholder text:placeholder-type="text">&lt;if test=&quot;invoice.party_tax_identifier&quot;&gt;</text:placeholder></text:p>
+   <text:p text:style-name="P19"><text:placeholder text:placeholder-type="text">&lt;invoice.party_tax_identifier.type_string&gt;</text:placeholder>: <text:placeholder text:placeholder-type="text">&lt;invoice.party_tax_identifier.code&gt;</text:placeholder></text:p>
    <text:p text:style-name="P19"><text:placeholder text:placeholder-type="text">&lt;/if&gt;</text:placeholder></text:p>
    <text:p text:style-name="Standard"><text:placeholder text:placeholder-type="text">&lt;if test=&quot;invoice.type == &apos;in&apos;&quot;&gt;</text:placeholder></text:p>
    <text:p text:style-name="P18"><text:span text:style-name="T2">Supplier Invoice N°:</text:span><text:span text:style-name="T2"><text:placeholder text:placeholder-type="text">&lt;invoice.number and &apos; &apos; + invoice.number or &apos;&apos;&gt;</text:placeholder></text:span></text:p>
diff --git a/invoice.py b/invoice.py
index ce3edc09c4..57b531d2b3 100644
--- a/invoice.py
+++ b/invoice.py
@@ -111,6 +111,13 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
         depends=_DEPENDS)
     party = fields.Many2One('party.party', 'Party',
         required=True, states=_STATES, depends=_DEPENDS)
+    party_tax_identifier = fields.Many2One(
+        'party.identifier', "Party Tax Identifier",
+        states=_STATES,
+        domain=[
+            ('party', '=', Eval('party', -1)),
+            ],
+        depends=_DEPENDS + ['party'])
     party_lang = fields.Function(fields.Char('Party Language'),
         'on_change_with_party_lang')
     invoice_address = fields.Many2One('party.address', 'Invoice Address',
@@ -461,6 +468,7 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
 
         if self.party:
             self.invoice_address = self.party.address_get(type='invoice')
+            self.party_tax_identifier = self.party.tax_identifier
 
     @fields.depends('currency')
     def on_change_with_currency_digits(self, name=None):
@@ -996,6 +1004,9 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
                 continue
             if not invoice.tax_identifier:
                 invoice.tax_identifier = invoice.get_tax_identifier()
+            # Generated invoice may not fill the party tax identifier
+            if not invoice.party_tax_identifier:
+                invoice.party_tax_identifier = invoice.party.tax_identifier
 
             if invoice.number:
                 continue
diff --git a/view/invoice_form.xml b/view/invoice_form.xml
index 346759f9ee..be4f4b76a6 100644
--- a/view/invoice_form.xml
+++ b/view/invoice_form.xml
@@ -12,7 +12,8 @@ this repository contains the full copyright notices and license terms. -->
     <field name="party"/>
     <label name="invoice_address"/>
     <field name="invoice_address"/>
-    <newline/>
+    <label name="party_tax_identifier" string="Tax Identifier"/>
+    <field name="party_tax_identifier"/>
     <label name="description"/>
     <field name="description" colspan="3"/>
     <label name="reference"/>