Get your GSTR-2B from the GST Portal through an API

What you can build on the GST Portal

• Get the GSTR-2B summary

  Build this

  Opens the Form GSTR-2B tile on the Returns Dashboard for one period and reads the SUMMARY tab: ITC Available, ITC not available, ITC Reversal and ITC Rejected.

  Takes

  Financial Year, Quarter, Period

  Returns

  Period, ITC Available, ITC not available, ITC Reversal, ITC Rejected

• Get the B2B invoices in GSTR-2B

  Build this

  Reads the B2B Invoices table under ALL TABLES in Form GSTR-2B for one period, with each invoice's tax details and remark.

  Takes

  Financial Year, Quarter, Period, ITC availability (optional)

  Returns

  Invoice number, supplier, tax details, ITC availability, remarks

• Get amended invoices in GSTR-2B

  Build this

  Reads the B2B Invoices (Amendment) table in Form GSTR-2B for one period: invoices your suppliers amended after filing them.

  Takes

  Financial Year, Quarter, Period

  Returns

  Invoice number, supplier, tax details, ITC availability, remarks

Automate the GST Portal with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• Monthly GSTR-2B summary by email

  Build this

  Starts

  Every month on the 14th at 20:00, India Standard Time

  Step 1

  Get the GSTR-2B summary for the month that just ended.

  Step 2

  Stop if the GSTR-2B for that period has not been generated yet.

  Step 3

  Email you ITC Available, ITC not available, ITC Reversal and ITC Rejected.

• GSTR-2B B2B invoices to your purchase register

  Build this

  Starts

  Every month on the 15th at 7:00, India Standard Time

  Step 1

  Get the B2B invoices in GSTR-2B for the month that just ended.

  Step 2

  Keep the invoices where ITC availability is yes.

  Step 3

  Post invoice number, supplier, tax details, ITC availability and remark to your ERP webhook for matching.

• Supplier amendments in each GSTR-2B, by supplier

  Build this

  Starts

  Every month on the 15th at 8:00, India Standard Time

  Step 1

  Get the amended invoices in GSTR-2B for the month that just ended.

  Step 2

  Stop if the B2B Invoices (Amendment) table has no rows.

  Step 3

  Group the amendments by supplier and email you invoice number, tax details and remark.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Get the GSTR-2B summary” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "gst.gov.in/get_gstr2b_summary",
    "input": {
      "financial_year": "2026-27",
      "quarter": "Quarter 2 (Jul - Sep)",
      "period": "September"
    }
  }'

{
  "status": "completed",
  "data": {
    "period": "September 2026",
    "itc_available": {
      "integrated_tax": 184250,
      "central_tax": 62410.5,
      "state_ut_tax": 62410.5,
      "cess": 0
    },
    "itc_not_available": {
      "integrated_tax": 3600,
      "central_tax": 0,
      "state_ut_tax": 0,
      "cess": 0
    },
    "itc_reversal": {
      "integrated_tax": 0,
      "central_tax": 1250,
      "state_ut_tax": 1250,
      "cess": 0
    },
    "itc_rejected": {
      "integrated_tax": 9000,
      "central_tax": 0,
      "state_ut_tax": 0,
      "cess": 0
    }
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

The GST Portal’s own options

GSTN's GST System APIs connect third-party applications built by GST Suvidha Providers (GSPs), which GSTN empanels and lists. A business reaches them through one of those applications. On the portal, GSTR-2B can be downloaded as Excel or as JSON for the Offline Matching Tool.

Read on November 12, 2026: GSTN: GST Suvidha Provider (GSP), GST Portal user manual: Viewing Form GSTR-2B, GST Portal FAQs: Form GSTR-2B.

Signing in to the GST Portal

The GST Portal at gst.gov.in asks for your username and password, then a one-time password sent to your registered mobile number by text message and to your registered email. A trusted browser is not asked for it every time. With Fous you sign in once through the portal's own sign-in with your own account: the login is sealed with AES-256, the emailed OTP is handled, and an expired session is signed back in.

Worth knowing

GSTR-2B arrives on the 14th

A monthly GSTR-2B is generated on the 14th of the following month, a quarterly one on the 14th of the month after the quarter. It holds supplier documents filed between the cut-off dates.

Over 1,000 documents, no table online

When GSTR-2B holds more than 1,000 documents across its tables, the document details are not shown on screen and the summary Excel button is disabled. You use advance search or the download page instead.

Sign-in from India only

The GST Portal does not allow sign-in from a country other than India, and blocks sign-in from an untrusted IP. A new device, or more than 5 attempts in a minute, asks for the OTP again.

IMS rejections stay out of GSTR-3B

The ITC Rejected section lists supplies rejected on the IMS dashboard. That credit is not populated in Form GSTR-3B.

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