[ADD] fiscal localizations: Indian GST service

In this commit, I have added documentation for GST return filing.
I have explained how to register on GST Portal, configure it in odoo,
and enable GST API Access on GST Portal. I have also explained different
GSTR Report.

task-3272960

closes odoo/documentation#3432

Signed-off-by: Castillo Jonathan (jcs) <jcs@odoo.com>

content/applications/finance/fiscal_localizations/india.rst

@@ -24,315 +24,477 @@ localization:
      - :ref:`Indian e-invoicing integration <india/e-invoicing>`
    * - :guilabel:`Indian E-waybill`
      - `l10n_in_edi_ewaybill`
-     - :ref:`Indian E-waybill integration <india/e-waybill>`
+     - :ref:`Indian E-way bill integration <india/e-waybill>`
+   * - :guilabel:`Indian - GSTR India eFiling`
+     - `l10n_in_reports_gstr`
+     - :ref:`Indian GST Return filing <india/gstr>`
+   * - :guilabel:`Indian - Accounting Reports`
+     - `l10n_in_reports`
+     - :ref:`Indian tax reports <india/gstr_reports>`
+   * - :guilabel:`Indian - Purchase Report(GST)`
+     - `l10n_in_purchase`
+     - Indian GST Purchase report
+   * - :guilabel:`Indian - Sale Report(GST)`
+     - `l10n_in_sale`
+     - Indian GST Sale report
+   * - :guilabel:`Indian - Stock Report(GST)`
+     - `l10n_in_stock`
+     - Indian GST Stock report
+
+.. image:: india/india-modules.png
+   :alt: Indian localization modules
 
 .. _india/e-invoicing:
 
-Indian e-invoicing
-==================
+e-Invoice system
+================
 
 Odoo is compliant with the **Indian Goods and Services Tax (GST) e-Invoice system** requirements.
 
-.. important::
-   Indian e-invoicing is available from Odoo 15.0. If needed, :doc:`upgrade
-   </administration/upgrade>` your database.
+Setup
+-----
 
 .. _india/e-invoicing-api:
 
-Registration on your NIC e-Invoice web portal
----------------------------------------------
+NIC e-Invoice registration
+~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-You must register on the **NIC e-Invoice** web portal to get your **API credentials**. You need
-these credentials to :ref:`configure your Odoo Accounting app <india/e-invoicing-configuration>`.
+You must register on the :abbr:`NIC (National Informatics Centre)` e-Invoice portal to get your
+**API credentials**. You need these credentials to :ref:`configure your Odoo Accounting app
+<india/e-invoicing-configuration>`.
 
-#. Log in to the NIC e-Invoice web portal at https://einvoice1.gst.gov.in/ by clicking on
-   :guilabel:`Login` and entering your :guilabel:`Username` and :guilabel:`Password`.
+#. Log in to the `NIC e-Invoice portal <https://einvoice1.gst.gov.in/>`_ by clicking
+   :guilabel:`Login` and entering your :guilabel:`Username` and :guilabel:`Password`;
 
    .. note::
-      If you have already registered on the NIC Eway Bill Production portal, then you can use the
-      same login credentials here.
+      If you are already registered on the NIC portal, you can use the same login credentials.
 
    .. image:: india/e-invoice-system-login.png
-      :align: center
       :alt: Register Odoo ERP system on e-invoice web portal
 
-#. From your dashboard, go to :menuselection:`API Registration --> User Credentials --> Create API
-   User`.
-
-   .. image:: india/e-invoice-create-api-user.png
-      :align: center
-      :alt: Click on User Credentials and Create API User
-
-#. After that, you receive an :abbr:`OTP (one-time password)` code to your registered mobile number.
-#. Enter the OTP code and click on :guilabel:`Verify OTP`.
-
-   .. image:: india/trigger-otp.png
-      :align: center
-      :alt: Trigger an OTP to your registered phone number
-
-#. Select :guilabel:`Through GSP` in the first field, select :guilabel:`Tera Software Limited`
-   as your GSP, and type in a :guilabel:`Username` and :guilabel:`Password` for your API.
+#. From the dashboard, go to :menuselection:`API Registration --> User Credentials --> Create API
+   User`;
+#. After that, you should receive an :abbr:`OTP (one-time password)` code on your registered mobile
+   number. Enter the OTP code and click :guilabel:`Verify OTP`;
+#. Select :guilabel:`Through GSP` for the API interface, set :guilabel:`Tera Software Limited` as
+   GSP, and type in a :guilabel:`Username` and :guilabel:`Password` for your API. Once it is done,
+   click :guilabel:`Submit`.
 
    .. image:: india/submit-api-registration-details.png
-      :align: center
       :alt: Submit API specific Username and Password
 
-#. Click on :guilabel:`Submit`.
-
 .. _india/e-invoicing-configuration:
 
-Configuration on Odoo
----------------------
+Configuration in Odoo
+~~~~~~~~~~~~~~~~~~~~~
 
-To set up the e-invoice service, go to :menuselection:`Accounting --> Configuration --> Settings -->
-Indian Electronic Invoicing`, and enter the :guilabel:`Username` and :guilabel:`Password`.
+To enable the e-Invoice service in Odoo, go to :menuselection:`Accounting --> Configuration -->
+Settings --> Indian Electronic Invoicing`, and enter the :guilabel:`Username` and
+:guilabel:`Password` previously set for the API.
 
 .. image:: india/e-invoice-setup.png
-   :align: center
    :alt: Setup e-invoice service
 
 .. _india/e-invoicing-journals:
 
 Journals
-~~~~~~~~
+********
 
-Your default *sales* journal should be already configured correctly. You can check it or configure
-other journals by going to :menuselection:`Accounting --> Configuration --> Journals`. Then, open
-your *sales* journal, and in the :guilabel:`Advanced Settings` tab, under :guilabel:`Electronic Data
-Interchange`, check :guilabel:`E-Invoice (IN)` and :guilabel:`Save`.
-
-.. image:: india/journal-configuration.png
-   :align: center
-   :alt: Journal configuration
+To automatically send e-Invoices to the NIC e-Invoice portal, you must first configure your *sales*
+journal by going to :menuselection:`Accounting --> Configuration --> Journals`, opening your *sales*
+journal, and in the :guilabel:`Advanced Settings` tab, under :guilabel:`Electronic Data
+Interchange`, enable :guilabel:`E-Invoice (IN)` and save.
 
 .. _india/e-invoicing-workflow:
 
 Workflow
 --------
 
-To start invoicing from Odoo, an invoice must be created using the standard invoicing flow, that is,
-either from a sales order or the invoice menu in the Accounting application.
-
 .. _india/invoice-validation:
 
 Invoice validation
 ~~~~~~~~~~~~~~~~~~
 
-Once the invoice is validated, a confirmation message is displayed at the top.
-
-Odoo automatically uploads the JSON-signed file to the government portal after a while. If you want
-to process the invoice immediately, you can click on :guilabel:`Process Now`.
+Once an invoice is validated, a confirmation message is displayed at the top. Odoo automatically
+uploads the JSON-signed file of validated invoices to the NIC e-Invoice portal after some time. If
+you want to process the invoice immediately, click :guilabel:`Process now`.
 
 .. image:: india/e-invoice-process.png
-   :align: center
-   :alt: Indian e-invoicing confirmation message: "The invoice will be processed asynchronously by
-         the following E-invoicing service : E-Invoice (IN)"
+   :alt: Indian e-invoicing confirmation message
 
 .. note::
-   - You can find the JSON-signed file in the attached files, in the chatter.
-   - You can check the status of EDI with web-service under the :guilabel:`EDI Document` tab or the
-     :guilabel:`Electronic invoicing` field.
+   - You can find the JSON-signed file in the attached files in the chatter.
+   - You can check the document's :abbr:`EDI (electronic data interchange)` status under the
+     :guilabel:`EDI Document` tab or the :guilabel:`Electronic invoicing` field of the invoice.
 
 .. _india/invoice-pdf-report:
 
-Invoice PDF Report
+Invoice PDF report
 ~~~~~~~~~~~~~~~~~~
 
-Once the invoice is submitted and validated, you can print the invoice PDF report. The report
-includes the :abbr:`IRN (Invoice Reference Number)`, acknowledgment number and date, and QR code.
-They certify that the invoice is a valid fiscal document.
+Once an invoice is validated and submitted, the invoice PDF report can be printed. The report
+includes the :abbr:`IRN (Invoice Reference Number)`, :guilabel:`Ack. No` (acknowledgment number) and
+:guilabel:`Ack. Date` (acknowledgment date), and QR code. These certify that the invoice is a valid
+fiscal document.
 
 .. image:: india/invoice-report.png
-   :align: center
    :alt: IRN and QR code
 
 .. _india/edi-cancellation:
 
-EDI Cancellation
-~~~~~~~~~~~~~~~~
+e-Invoice cancellation
+~~~~~~~~~~~~~~~~~~~~~~
 
-If you want to cancel an e-invoice, go to the :guilabel:`Other info` tab of the invoice and fill out
-the :guilabel:`Cancel reason` and :guilabel:`Cancel remarks` fields. Then, click on
-:guilabel:`Request EDI cancellation`. The status of the :guilabel:`Electronic invoicing` field
-changes to :guilabel:`To Cancel`.
+If you want to cancel an e-Invoice, go to the :guilabel:`Other info` tab of the invoice and fill out
+the :guilabel:`Cancel reason` and :guilabel:`Cancel remarks` fields. Then, click :guilabel:`Request
+EDI cancellation`. The status of the :guilabel:`Electronic invoicing` field changes to :guilabel:`To
+Cancel`.
 
 .. important::
-   Doing so cancels both the :ref:`E-invoice <india/e-invoicing>` and the :ref:`E-waybill
+   Doing so cancels both the :ref:`e-Invoice <india/e-invoicing>` and the :ref:`E-Way bill
    <india/e-waybill>`.
 
 .. image:: india/e-invoice-cancellation.png
-   :align: center
    :alt: cancel reason and remarks
 
 .. note::
-   - If you want to abort the cancellation before processing the invoice, then click on
-     :guilabel:`Call Off EDI Cancellation`.
-   - Once you request to cancel the e-invoice, Odoo automatically submits the JSON Signed file to
-     the government portal. You can click on :guilabel:`Process Now` if you want to process the
+   - If you want to abort the cancellation before processing the invoice, then click :guilabel:`Call
+     Off EDI Cancellation`.
+   - Once you request to cancel the e-Invoice, Odoo automatically submits the JSON-signed file to
+     the NIC e-Invoice portal. You can click :guilabel:`Process now` if you want to process the
      invoice immediately.
 
 .. _india/verify-e-invoice:
 
-Verify the e-invoice from the GST
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+GST e-Invoice verification
+~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-After submitting an e-invoice, you can also verify the signed invoice from the GST e-Invoice system
-website.
+After submitting an e-Invoice, you can verify if the invoice is signed from the GST e-Invoice system
+website itself.
 
-#. Download the JSON file from the attached files.
-#. Open the e-invoice portal: https://einvoice1.gst.gov.in/ and go to :menuselection:`Search -->
-   Verify Signed Invoice`.
-#. Select the JSON file and submit it.
+#. Download the JSON file from the attached files. It can be found in the chatter of the related
+   invoice;
+#. Open the `NIC e-Invoice portal <https://einvoice1.gst.gov.in/>`_ and go to
+   :menuselection:`Search --> Verify Signed Invoice`;
+#. Select the JSON file and submit it;
 
    .. image:: india/verify-invoice.png
-      :align: center
       :alt: select the JSON file for verify invoice
 
-#. You can check the verified signed e-invoice here.
+   If the file is signed, a confirmation message is displayed.
 
    .. image:: india/signed-invoice.png
-      :align: center
       :alt: verified e-invoice
 
 .. _india/e-waybill:
 
-Indian E-waybill
-================
+E-Way bill
+==========
+
+Setup
+-----
 
 Odoo is compliant with the **Indian Goods and Services Tax (GST) E-waybill system** requirements.
 
-.. important::
-   Indian E-waybill is available from Odoo 15.0. If needed, :doc:`upgrade </administration/upgrade>`
-   your database.
-
 .. _india/e-waybill-api:
 
-API Registration on your NIC E-waybill web portal
--------------------------------------------------
+API registration on NIC E-Way bill
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-You must register on the **NIC E-waybill** web portal to create your **API credentials**. You need
-these credentials to :ref:`configure your Odoo Accounting app <india/e-waybill-configuration>`.
+You must register on the :abbr:`NIC (National Informatics Centre)` E-Way bill portal to create your
+**API credentials**. You need these credentials to :ref:`configure your Odoo Accounting app
+<india/e-waybill-configuration>`.
 
-#. Log in to the NIC E-waybill web portal at https://ewaybillgst.gov.in/ by clicking on
-   :guilabel:`Login` and entering your :guilabel:`Username` and :guilabel:`Password`.
-
-   .. image:: india/e-waybill-system-login.png
-      :align: center
-      :alt: E-waybill login
-
-#. From your dashboard, go to :menuselection:`Registration --> For GSP`.
-
-   .. image:: india/e-waybill-registration-menu.png
-      :align: center
-      :alt: E-waybill registration
-
-#. Click on :guilabel:`Send OTP`; you should receive an :abbr:`OTP (one-time password)` code to your
-   registered mobile number.
-#. Enter the OTP code and click on :guilabel:`Verify OTP`.
-
-   .. image:: india/e-waybill-gsp-registration.png
-      :align: center
-      :alt: E-waybill OTP verification
-
-#. Check if :guilabel:`Tera Software Limited` is already on the list of registered GSP/ERP. If so,
-   use this username and password. Otherwise, follow the next steps.
+#. Log in to the `NIC E-Way bill portal <https://ewaybillgst.gov.in/>`_ by clicking
+   :guilabel:`Login` and entering your :guilabel:`Username` and :guilabel:`Password`;
+#. From your dashboard, go to :menuselection:`Registration --> For GSP`;
+#. Click :guilabel:`Send OTP`. Once you have received the code on your registered mobile number,
+   enter it and click :guilabel:`Verify OTP`;
+#. Check if :guilabel:`Tera Software Limited` is already on the registered GSP/ERP list. If so, use
+   the username and password used to log in to the NIC portal. Otherwise, follow the next steps;
 
    .. image:: india/e-waybill-gsp-list.png
-      :align: center
-      :alt: E-waybill list of registered GSP/ERP
+      :alt: E-Way bill list of registered GSP/ERP
 
 #. Select :guilabel:`Add/New`, select :guilabel:`Tera Software Limited` as your GSP Name, create a
-   :guilabel:`Username` and a :guilabel:`Password` for your API, and click on :guilabel:`Add`.
+   :guilabel:`Username` and a :guilabel:`Password` for your API, and click :guilabel:`Add`.
 
    .. image:: india/e-waybill-registration-details.png
-      :align: center
       :alt: Submit GSP API registration details
 
 .. _india/e-waybill-configuration:
 
-Configuration on Odoo
----------------------
+Configuration in Odoo
+~~~~~~~~~~~~~~~~~~~~~
 
-To set up the E-waybill service, go to :menuselection:`Accounting --> Configuration --> Settings -->
-Indian Electronic WayBill --> Setup E-Waybill`, and enter your :guilabel:`Username` and
+To set up the E-Way bill service, go to :menuselection:`Accounting --> Configuration --> Settings
+--> Indian Electronic WayBill --> Setup E-Way bill`, and enter your :guilabel:`Username` and
 :guilabel:`Password`.
 
 .. image:: india/e-waybill-configuration.png
-   :align: center
-   :alt: E-waybill setup odoo
+   :alt: E-way bill setup odoo
 
 .. _india/e-waybill-workflow:
 
 Workflow
 --------
 
-To issue an E-waybill from Odoo, you must create an invoice/bill with the details of the E-waybill
-using the standard invoicing/bill flow (either from a sales/purchase order or the invoice/bill menu
-in Accounting).
-
 .. _india/e-waybill-send:
 
-Send an E-waybill
-~~~~~~~~~~~~~~~~~
+Send an E-Way bill
+~~~~~~~~~~~~~~~~~~
 
-You can manually send an E-waybill by clicking on :guilabel:`Send E-waybill`.
+You can manually send an E-Way bill by clicking :guilabel:`Send E-Way bill`. To send the E-Way bill
+automatically when an invoice or a bill is confirmed, enable :guilabel:`E-Way bill (IN)` in your
+:ref:`Sales or Purchase journal <india/e-invoicing-journals>`.
 
 .. image:: india/e-waybill-send-button.png
-   :align: center
    :alt: Send E-waybill button on invoices
 
-To send the E-waybill automatically when you confirm an invoice or a bill, enable
-:guilabel:`E-waybill (IN)` in your :ref:`Sale/Purchase Journal <india/e-invoicing-journals>`.
-
 .. _india/invoice-validation-e-way:
 
 Invoice validation
 ~~~~~~~~~~~~~~~~~~
 
-Once you have issued the invoice and clicked on :guilabel:`Send E-waybill`, a confirmation message
-is displayed.
-
-.. note::
-   - Odoo automatically uploads the JSON-signed file to the government portal after a while. You can
-     click on :guilabel:`Process Now` if you want to process the invoice immediately.
-   - You can find the JSON-signed file in the attached files in the chatter.
+Once an invoice has been issued and sent via :guilabel:`Send E-Way bill`, a confirmation message is
+displayed.
 
 .. image:: india/e-waybill-process.png
-   :align: center
-   :alt: Indian e-waybill confirmation message: "The invoice will be processed asynchronously by
-         the following E-waybill service : E-waybill (IN)"
+   :alt: Indian e-Way bill confirmation message
 
-Invoice PDF Report
+.. note::
+   - You can find the JSON-signed file in the attached files in the chatter.
+   - Odoo automatically uploads the JSON-signed file to the government portal after some time. Click
+     :guilabel:`Process now` if you want to process the invoice immediately.
+
+Invoice PDF report
 ~~~~~~~~~~~~~~~~~~
 
-You can print the invoice PDF report once you have submitted the E-waybill. The report includes the
-**E-waybill number** and the **E-waybill validity date**.
+You can print the invoice PDF report once you have submitted the E-Way bill. The report includes the
+**E-Way bill number** and the **E-Way bill validity date**.
 
 .. image:: india/e-waybill-invoice-report.png
-   :align: center
-   :alt: E-waybill acknowledgment number and date
+   :alt: E-way bill acknowledgment number and date
 
 .. _india/e-waybill-cancellation:
 
-E-waybill Cancellation
-~~~~~~~~~~~~~~~~~~~~~~
+E-Way bill cancellation
+~~~~~~~~~~~~~~~~~~~~~~~
 
-If you want to cancel an E-waybill, go to the :guilabel:`eWayBill` tab of the invoice and fill out
-the :guilabel:`Cancel reason` and :guilabel:`Cancel remarks` fields. Then, click on
+If you want to cancel an E-Way bill, go to the :guilabel:`E-Way bill` tab of the related invoice and
+fill out the :guilabel:`Cancel reason` and :guilabel:`Cancel remarks` fields. Then, click
 :guilabel:`Request EDI Cancellation`.
 
 .. important::
-   Doing so cancels both the :ref:`E-invoice <india/e-invoicing>` and the :ref:`E-waybill
-   <india/e-waybill>`.
+   Doing so cancels both the :ref:`e-Invoice <india/e-invoicing>` (if applicable) and the
+   :ref:`E-Way bill <india/e-waybill>`.
 
 .. image:: india/e-waybill-cancellation.png
-   :align: center
-   :alt: cancel reason and remarks
+   :alt: Cancel reason and remarks
 
 .. note::
-   - If you want to abort the cancellation before processing the invoice, click on :guilabel:`Call
-     Off EDI Cancellation`.
-   - If the E-invoice is applicable for this invoice, then it will also be canceled.
-   - Once you request to cancel the E-waybill, Odoo automatically submits the JSON Signed file to
-     the government portal. You can click on :guilabel:`Process Now` if you want to process the
-     invoice immediately.
+   - If you want to abort the cancellation before processing the invoice, click :guilabel:`Call Off
+     EDI Cancellation`.
+   - Once you request to cancel the E-Way bill, Odoo automatically submits the JSON-signed file to
+     the government portal. You can click :guilabel:`Process Now` if you want to process the invoice
+     immediately.
+
+.. _india/gstr:
+
+Indian GST Return filing
+========================
+
+.. _india/gstr_api:
+
+Enable API access
+-----------------
+
+To file GST Returns in Odoo, you must first enable API access on the GST portal.
+
+#. Log into the `GST portal <https://services.gst.gov.in/services/login>`_ by entering your
+   :guilabel:`Username` and :guilabel:`Password`, and go to :guilabel:`My Profile` on your **profile
+   menu**;
+
+   .. image:: india/gst-portal-my-profile.png
+      :alt: Click On the My Profile from profile
+
+#. Select :guilabel:`Manage API Access`, and click :guilabel:`Yes` to enable API access;
+
+   .. image:: india/gst-portal-api-yes.png
+      :alt: Click Yes
+
+#. Doing so enables a :guilabel:`Duration` drop-down menu. Select the :guilabel:`Duration` of your
+   preference, and click :guilabel:`Confirm`.
+
+.. _india/gstr_configuration:
+
+Indian GST Service In Odoo
+--------------------------
+
+Once you have enabled the :ref:`API access <india/gstr_api>` on the GST portal, you can set up the
+:guilabel:`Indian GST Service` in Odoo.
+
+Go to :menuselection:`Accounting --> Configuration --> Settings --> Indian GST Service` and enter
+the :guilabel:`GST Username`. Click :guilabel:`Send OTP`, enter the code, and finally,
+:guilabel:`Validate`.
+
+   .. image:: india/gst-setup.png
+      :alt: Please enter your GST portal Username as Username
+
+.. _india/gstr_workflow:
+
+File-in GST Return
+------------------
+
+When the :guilabel:`Indian GST Service` is configured, you can file your GST return. Go to
+:menuselection:`Accounting --> Reporting --> India --> GST Return periods` and create a new **GST
+Return Period** if it does not exist. GST Return file-in is done in **three steps** in Odoo:
+
+.. note::
+   **Tax Return Periodicity** can be
+   :doc:`configured <../accounting/reporting/declarations/tax_returns>` according to the user's
+   needs.
+
+.. _india/gstr-1:
+
+Send GSTR-1
+~~~~~~~~~~~
+
+#. The user can verify the :ref:`GSTR-1 <india/gstr-1_report>` report before uploading it to the
+   **GST portal** by clicking :guilabel:`GSTR-1 Report`;
+#. If the **GSTR-1** report is correct, then click :guilabel:`Push to GSTN` to send it to the **GST
+   portal**. The status of the :guilabel:`GSTR-1` report changes to :guilabel:`Sending`;
+
+   .. image:: india/gst-gstr-1-sending.png
+      :alt: GSTR-1 in the Sending Status
+
+#. After a few seconds, the status of the **GSTR-1** report changes to :guilabel:`Waiting for
+   Status`. It means that the **GSTR-1** report has been sent to the :guilabel:`GST Portal` and is
+   being verified on the :guilabel:`GST Portal`;
+
+   .. image:: india/gst-gstr-1-waiting.png
+      :alt: GSTR-1 in the Waiting for Status
+
+#. Once more, after a few seconds, the status either changes to :guilabel:`Sent` or :guilabel:`Error
+   in Invoice`. The status :guilabel:`Error in Invoice` indicates that some of the invoices are not
+   correctly filled out to be validated by the **GST portal**;
+
+   - If the state of the **GSTR-1** is :guilabel:`Sent`, it means your **GSTR-1** report is ready to
+     be filed on the **GST portal**.
+
+     .. image:: india/gst-gstr-1-sent.png
+        :alt: GSTR-1 Sent
+
+   - If the state of the **GSTR-1** is :guilabel:`Error in Invoice`, invoices can be checked for
+     errors in the :guilabel:`Log Note`. Once issues have been resolved, the user can click
+     :guilabel:`Push to GSTN` to submit the file again on the **GST portal**.
+
+     .. image:: india/gst-gstr-1-error.png
+        :alt: GSTR-1 Error in Invoice
+
+   .. image:: india/gst-gstr-1-error-log.png
+      :alt: GSTR-1 Error in Invoice Log
+
+#. Click :guilabel:`Mark as Filed` after filing the **GSTR-1** report on the **GST portal**. The
+   status of the report changes to :guilabel:`Filed` in **Odoo**.
+
+   .. image:: india/gst-gstr-1-filed.png
+      :alt: GSTR-1 in the Filed Status
+
+.. _india/gstr-2B:
+
+Receive GSTR-2B
+~~~~~~~~~~~~~~~
+
+Users can retrieve the **GSTR-2B Report** from the **GST portal**. This automatically reconciles
+the **GSTR-2B** report with your Odoo bills;
+
+#. Click :guilabel:`Fetch GSTR-2B Summary` to retrieve the **GSTR-2B** summary. After a few seconds,
+   the status of the report changes to :guilabel:`Waiting for Reception`. This means Odoo is trying
+   to receive the **GSTR-2B** report from the **GST portal**;
+
+   .. image:: india/gst-gstr-2b-waiting.png
+      :alt: GSTR-2B in Waiting for Reception
+
+#. Once more, after a few seconds, the status of the **GSTR-2B** changes to the :guilabel:`Being
+   Processed`. It means Odoo is reconciling the **GSTR-2B** report with your Odoo bills;
+
+   .. image:: india/gst-gstr-2b-processed.png
+      :alt: GSTR-2B in Waiting for Reception
+
+#. Once it is done, the status of the **GSTR-2B** report changes to either :guilabel:`Matched` or
+   :guilabel:`Partially Matched`;
+
+   - If the status is :guilabel:`Matched`:
+
+      .. image:: india/gst-gstr-2b-matched.png
+         :alt: GSTR-2B Matched
+
+   - If the status is :guilabel:`Partially Matched`, you can make changes in bills by clicking
+     :guilabel:`View Reconciled Bills`. Once it is done, click :guilabel:`re-match`.
+
+      .. image:: india/gst-gstr-2b-partially.png
+         :alt: GSTR-2B Partially Matched
+
+      .. image:: india/gst-gstr-2b-reconcile.png
+         :alt: GSTR-2B Reconciled Bills
+
+.. _india/gstr-3:
+
+GSTR-3 report
+~~~~~~~~~~~~~
+
+The :ref:`GSTR-3 <india/gstr-3_report>` report is a monthly summary of **sales** and **purchases**.
+This return is auto-generated by extracting information from **GSTR-1** and **GSTR-2**.
+
+#. Users can compare the **GSTR-3** report with the **GSTR-3** report available on the
+   **GST portal** to verify if they match by clicking :guilabel:`GSTR-3 Report`;
+
+#. Once the **GSTR-3** report has been verified by the user and the tax amount on the **GST portal**
+   has been paid. Once paid, the report can be **closed** by clicking :guilabel:`Closing Entry`;
+
+   .. image:: india/gst-gstr-3.png
+      :alt: GSTR-3
+
+#. In :guilabel:`Closing Entry`, add the tax amount paid on the **GST portal** using challan, and
+   click :guilabel:`POST` to post the :guilabel:`Closing Entry`;
+
+   .. image:: india/gst-gstr-3-post.png
+      :alt: GSTR-3 Post Entry
+
+#. Once posted, the **GSTR-3** report status changes to :guilabel:`Filed`.
+
+   .. image:: india/gst-gstr-3-filed.png
+      :alt: GSTR-3 Filed
+
+.. _india/gstr_reports:
+
+Tax reports
+===========
+
+.. _india/gstr-1_report:
+
+GSTR-1 report
+-------------
+
+The :guilabel:`GSTR-1` report is divided into sections. It displays the :guilabel:`Base` amount,
+:abbr:`CGST (Central Goods and Services Tax)`, :abbr:`SGST (State Goods and Service Tax)`,
+:abbr:`IGST (Integrated Goods and Services Tax)`, and :guilabel:`CESS` for each section.
+
+   .. image:: india/gst-gstr-1-sale-report.png
+      :alt: GSTR-1 Report
+
+.. _india/gstr-3_report:
+
+GSTR-3 report
+-------------
+
+The :guilabel:`GSTR-3` report contains different sections:
+
+- Details of inward and outward supply subject to a **reverse charge**;
+- Eligible :abbr:`ITC (Income Tax Credit)`;
+- Values of **exempt**, **Nil-rated**, and **non-GST** inward supply;
+- Details of inter-state supplies made to **unregistered** persons.
+
+   .. image:: india/gst-gstr-3-report.png
+      :alt: GSTR-3 Report