GSTR-1A, GSTR-1 and IFF Liability Declaration Details
GET
https://apisandbox.whitebooks.in/gstr1a/getdeclarationThis API is used to view the GSTR1 , GSTR1A and IFF Liability details along with Available ITC ,Cash Ledger details and ITC Available as per GSTR2B Details.
Parameters
query parameters
gstinstringrequiredGSTIN of the taxpayer
retperiodstringrequiredReturn Period
emailstringrequiredEmail
header parameters
gst_usernamestringrequiredGST UserName
state_cdstringrequiredState Code
ip_addressstringrequiredIP Address
txnstringrequiredTransaction
client_idstringrequiredClient ID
client_secretstringrequiredClient Secret
Response
Not Found. If requested entity is not found or if requested API is not found.
Frequently Asked Questions
The endpoint returns GSTR-1, GSTR-1A, and IFF liability details including section-wise tax summaries, available ITC (from GSTR-2B), cash ledger balances, and the differential amounts between GSTR-1 and GSTR-1A data — used to review pre-confirmation liability state.
Mandatory query parameters:
gstin, retperiod (MMYYYY format), email. Mandatory headers: gst_username, state_cd, ip_address, txn, client_id, client_secret. An active GST portal session (txn) is required.Call this endpoint after any amendments have been entered into GSTR-1A but before confirming the declaration. It gives you the full liability picture so you can verify that liabilities, ITC, and ledger balances are correct before committing via POST /gstr1a/confirmdeclaration.
The
retperiod query parameter must follow MMYYYY format, for example 102026 for October 2026. Supplying an incorrect format returns a validation error.No example available.