> ## Documentation Index
> Fetch the complete documentation index at: https://www.aiaccountant.com/help/llms.txt
> Use this file to discover all available pages before exploring further.

# GST reconciliation overview

> What GSTR-2B reconciliation does, what you need before you start, and the shape of the whole flow.

Under GST, the Input Tax Credit you can claim is tied to what your suppliers have actually filed and what appears in your GSTR-2B. Reconciliation is how you confirm your books and the portal agree before you file.

AI Accountant matches your purchase register against GSTR-2B, shows you where they disagree, lets you classify each credit, and exports a workbook that includes Table 4 of GSTR-3B.

## What you need

| Item              | Detail                                                                                           |
| ----------------- | ------------------------------------------------------------------------------------------------ |
| GSTIN             | The registration you are reconciling for. Multiple GSTINs under the same PAN can be added, once. |
| Return period     | A single month, or a range such as April to March for the full financial year.                   |
| GSTR-2B data      | Fetched from the portal through the API, or uploaded as a file.                                  |
| Purchase register | Your books, as Excel or CSV. Several files can be uploaded together.                             |

Reconciling the whole year in one run is the easiest way to catch credits missed in earlier months.

## The flow

<CardGroup cols={2}>
  <Card title="Start a reconciliation" icon="play" href="/help/gst/start-a-reconciliation">
    Choose the GSTIN and return period.
  </Card>

  <Card title="Bring in GSTR-2B" icon="cloud-arrow-down" href="/help/gst/fetch-or-upload-gstr-2b">
    Fetch from the portal, or upload the file.
  </Card>

  <Card title="Purchase register" icon="file-import" href="/help/gst/upload-and-map-purchase-register">
    Upload your books and map the columns.
  </Card>

  <Card title="Read the results" icon="chart-column" href="/help/gst/read-reconciliation-results">
    Understand what each match status means.
  </Card>
</CardGroup>

For the next period, click **New Reconciliation** and run it again.

<Warning>
  The report is a strong assist, and you remain responsible for verifying the figures before filing. Do a final review with your tax professional.
</Warning>