GSTR-3B From Extracted Invoice Data: Monthly Summary and Payment
Dynamite Docs Team — 2026-08-14
GSTR-3B is a summary, not a list
Unlike GSTR-1, which lists invoice-level outward details, GSTR-3B is the monthly summary return: the value of outward taxable supplies, the input tax credit you intend to claim, the net tax payable, and the payment. The same transactions that feed GSTR-1 and the GSTR-2B statement get summarized into a handful of figures.
Those figures have to reconcile to your books. If the summary says one value and your invoices add up to another, the mismatch is a problem to solve at filing time, under a deadline. The working data behind the summary, your sales invoices and credit notes on the outward side, your purchase invoices on the input-credit side, is where the reconciliation is won.
- GSTR-3B condenses outward supplies, input credit, net tax, and payment into a few figures
- The figures must tie to your invoice rows
- The working data is built before the return, not at filing time
Where the summary values come from
The outward side of the summary comes from your sales invoices, credit notes, and debit notes: the taxable value and the CGST/SGST or IGST split, net of adjustments. The input-credit side comes from your purchase invoices and receipts, with the same split. When both sides are extracted into confidence-scored rows, the summary is a sum over clean data instead of a transcription of the month’s PDFs.
The CGST/SGST versus IGST distinction matters at this level. Intra-state supplies split the tax two ways, inter-state supplies carry a single IGST line, and GSTR-3B separates the tax head totals. Extraction keeps the split in its own columns and flags rows where taxable value times rate does not tie to the tax amount, so a swapped or mistyped figure surfaces before it reaches the summary.
- Outward supplies net of credit and debit notes
- Input credit from purchase invoices, split by tax head
- The CGST/SGST/IGST split is kept in separate columns for the summary
Month-end becomes a check, not a scramble
Batch extraction turns a month of sales and purchase documents into one review session. Export the outward and inward rows to Excel, CSV, or JSON, or push them to Google Sheets, and build the summary from rows that already tie out. Because corrections are remembered per layout, the second month from the same billing software extracts cleanly and the review shrinks to the fields that genuinely need a human.
GSTR-3B itself is filed on the GST portal by your CA or your team. Dynamite Docs is a document-processing and data-preparation layer: it supplies the extracted rows the summary is built from. Classification, eligibility, payment, and filing decisions remain with the people responsible for the return, and the rules change, so consult the GST portal and your tax advisor for your period.
Keep invoice data off models you didn’t choose
GST invoice data is not content for a model you did not approve. Bring your own keys on every plan and pay your provider’s rate with zero markup; on Pro and Ultra that BYOK processing is unlimited and never counts against your monthly allowance. Documents are encrypted at rest, never used to train foundation models, and sensitive processing can be locked to no-training providers or run fully local with Ollama.
Related workflow: GSTR-1 invoice data preparation.
Try it yourself. Upload a PDF, scan, or image and let Dynamite Docs infer the schema.