[ADD] accounting: localization page for uk

closes odoo/documentation#3518

X-original-commit: 0550374968
Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>
Signed-off-by: Pirlot Donatienne (dopi) <dopi@odoo.com>

content/applications/finance/accounting/fiscal_localizations/localizations.rst

@@ -26,3 +26,4 @@ Localizations
    localizations/peru
    localizations/spain
    localizations/switzerland
+   localizations/united_kingdom

content/applications/finance/accounting/fiscal_localizations/localizations/united_kingdom.rst

@@ -0,0 +1,117 @@
+==============
+United Kingdom
+==============
+
+Configuration
+=============
+
+:ref:`Install <general/install>` the :guilabel:`UK - Accounting` and the :guilabel:`UK - Accounting
+Reports` modules to get all the features of the UK localization.
+
+.. list-table::
+   :header-rows: 1
+
+   * - Name
+     - Technical name
+     - Description
+   * - :guilabel:`UK - Accounting`
+     - `l10n_uk`
+     -  - CT600-ready chart of accounts
+        - VAT100-ready tax structure
+        - Infologic UK counties listing
+   * - :guilabel:`UK - Accounting Reports`
+     - `l10n_uk_reports`
+     -  - Accounting reports for the UK
+        - Allows sending the tax report via the MTD-VAT API to HMRC.
+
+.. image:: united_kingdom/uk.png
+   :align: center
+   :alt: Odoo uk packages
+
+.. note::
+   - Only UK-based companies can submit reports to HMRC.
+   - Installing the module :guilabel:`UK - Accounting Reports` installs all two modules at once.
+
+.. seealso::
+   - `HM Revenue & Customs <https://www.gov.uk/government/organisations/hm-revenue-customs/>`_
+   - `Overview of Making Tax Digital
+     <https://www.gov.uk/government/publications/making-tax-digital/overview-of-making-tax-digital/>`_
+
+Chart of accounts
+=================
+
+The UK chart of accounts is included in the :guilabel:`UK - Accounting` module. Go to
+:menuselection:`Accounting --> Configuration --> Accounting: Chart of Accounts` to access it.
+
+Setup your :abbr:`CoA (chart of accounts)` by going to :menuselection:`Accounting --> Configuration
+--> Settings --> Accounting Import section` and choose to :guilabel:`Review Manually` or
+:guilabel:`Import (recommended)` your initial balances.
+
+Taxes
+=====
+
+As part of the localization module, UK taxes are created automatically with their related financial
+accounts and configuration.
+
+Go to :menuselection:`Accounting --> Configuration --> Settings --> Taxes` to update the
+:guilabel:`Default Taxes`, the :guilabel:`Tax Return Periodicity` or to :guilabel:`Configure your
+tax accounts`.
+
+To edit existing taxes or to :guilabel:`Create` a new tax, go to :menuselection:`Accounting -->
+Configuration --> Accounting: Taxes`.
+
+.. seealso::
+   - :doc:`taxes <../../taxation/taxes>`
+   - Tutorial: `Tax report and return
+     <https://www.odoo.com/slides/slide/tax-report-and-return-1719?fullscreen=1>`_.
+
+Making Tax Digital (MTD)
+------------------------
+
+In the UK, all VAT-registered businesses have to follow the MTD rules by using software to submit
+their VAT returns.
+
+The **UK - Accounting Reports** module enables you to comply with the `HM Revenue & Customs
+<https://www.gov.uk/government/organisations/hm-revenue-customs/>`_ requirements regarding
+`Making Tax Digital
+<https://www.gov.uk/government/publications/making-tax-digital/overview-of-making-tax-digital/>`_.
+
+.. important::
+   If your periodic submission is more than three months late, it is no longer possible to submit
+   it through Odoo, as Odoo only retrieves open bonds from the last three months. Your submission
+   has to be done manually by contacting HMRC.
+
+Register your company to HMRC before the first submission
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Go to :menuselection:`Accounting --> Reporting --> Tax report` and click on
+:guilabel:`Connect to HMRC`. Enter your company information on the HMRC platform. You only need to
+do it once.
+
+.. Note::
+   When entering your VAT number, do not add the GB country code. Only the 9 digits are required.
+
+Periodic submission to HMRC
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Import your obligations HMRC, filter on the period you want to submit, and send your tax report by
+clicking :guilabel:`Send to HMRC`.
+
+Periodic submission to HMRC for multi-company
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Only one company and one user can connect to HMRC simultaneously. If several UK-based companies are
+on the same database, the user who submits the HMRC report must follow these instructions before
+each submission:
+
+#. Log into the company for which the submission has to be done.
+#. Go to :guilabel:`General Settings`, and in the :guilabel:`Users` section, click
+   :guilabel:`Manage Users`. Select the user who will submit the VAT return.
+#. Go to the :guilabel:`UK HMRC Integration` tab and click :guilabel:`Reset Authentication
+   Credentials` or :guilabel:`Remove Authentication Credentials` button. Then click again to create
+   new credentials. It is now possible to submit the tax report for this company.
+#. Repeat the steps for other companies' HMRC submissions.
+
+.. note::
+   During this process, the :guilabel:`Connect to HMRC` button no longer appears for other UK-based
+   companies.