HSN/SAC code extraction from invoices

By Dynamite Docs. Published 2026-08-14. Updated 2026-09-11.

Turn GST invoices into clean, reviewed data for Excel and Tally.

GST invoices may show an HSN or SAC beside each line, inside the description, or only in a summary table. Dynamite Docs extracts the code as printed and keeps it with the related description, quantity, taxable value and tax rate. This creates a reviewable line-item schedule for purchase registers and return preparation. It does not determine the correct classification or rate for a product or service. When the source is missing, inconsistent or ambiguous, the code should be routed to the person responsible for tax classification rather than inferred and treated as final.

Scope and tax review

Content owner: Dynamite Docs content team. Official-source review last updated: 2026-09-11.

Dynamite Docs extracts fields from source documents. It does not determine whether an invoice complies with GST law, prepare a return, or make a document ready to file. Review every extracted value against the original and use the current GST Portal guidance or a qualified tax professional before filing.

We publish the controls we actually operate rather than claiming certifications we do not yet hold.

Official GST sources

Notification 78/2020: HSN reporting requirements, Central Board of Indirect Taxes and Customs. Turnover-based 4-digit and 6-digit HSN/SAC reporting rules on B2B invoices.
CGST Rules: tax invoice particulars (Rule 46), Central Board of Indirect Taxes and Customs. Mandatory 16 invoice particulars and tax invoice format requirements.
Form GSTR-1 preparation and Returns Offline Tool FAQs, GST Portal. GSTR-1 invoice data, preparation modes, validation, and error correction.

Try a document or compare its storage, processing, and export limits.

The actual Dynamite Docs library import menu, with upload and Google Drive options.

The actual AI processing dialog showing the searchable model list and provider filters.

A purchase order beside its extracted text in the Text Editor.

A purchase order beside its structured details in the Table Editor.

A purchase order beside its extracted line items in the Table Editor.

A purchase order beside the Table Editor Totals tab, showing tax and the final total.

Purchase order text beside extracted document fields and confidence indicators.

The actual Export to Google Drive dialog with format, scope, file name and folder options.

HSN/SAC code extraction from invoices: sample source document and illustrative field names and values — **01 / Sample field guide** — Illustrated field guide. Example values may differ from the downloadable sample.

Dynamite Docs product screenshot with a vendor invoice beside extracted fields — **02 / Product review workspace** — Invoice example showing the shared review controls. Fields vary by document type.

Product classification codes are easy to misread when entered manually

Businesses with turnover above ₹5 Crore must report 6-digit HSN codes, while businesses up to ₹5 Crore report 4-digit codes. Missing digits can lead to return filing discrepancies.
Invoices often place the tariff code directly inside the description text (for example, "A4 Copier Paper 80GSM HSN:4820"), making manual copying slow.
Mixed invoices combining goods with freight or transport services require distinguishing goods tariff headings from Chapter 99 service codes.
Reviewing product codes line by line takes hours when processing dozens of multi-item invoices every month.

Document types this workflow handles

Goods tax invoices: 4, 6, and 8-digit HSN codes per line
Service invoices: 6-digit Chapter 99 SAC codes
Mixed supply invoices: combined goods and transport lines
Credit & debit notes: tariff adjustments against original invoices

What gets extracted per line

Every line item receives complete classification context, confidence-scored and normalized for accounting entries:

HSN / SAC code: 4820 20 00 / 9965 11
Classification type: Goods (HSN) / Service (SAC)
Code length: 4-digit / 6-digit / 8-digit
Clean item description: A4 Copier Paper (80 GSM)
Quantity & UQC: 40 reams (BOX/NOS/KGS)
Unit price & line discount: ₹600.00 (₹0.00 discount)
Line taxable value: ₹24,000.00
Applicable GST rate: 12% (6% CGST + 6% SGST)

Tax invoice, Mehta Steel Supplies, INV/2026-27/0188. Fictional sample document. — Downloadable sample: INV/2026-27/0188. Demonstration data for extraction practice.

A realistic example

Sample data. Not a real invoice or filing record.

A multi-line tax invoice with mixed goods and transport services extracts to clean, structured line items:

Line	Item Description	Classification	HSN/SAC	Qty & Unit	Rate	Taxable Value
1	A4 Copier Paper (80 GSM)	Goods	4820 20 00	40 reams	12%	₹24,000.00
2	Rotary Hammer Drill 800W	Goods	8467 21 00	6 units	18%	₹1,86,000.00
3	Freight & Handling (GTA)	Service	9965 11	1 trip	5%	₹12,000.00

What to validate before export

Validation issue

Verify every code against the source line and current classification guidance.

Limitation

The extractor does not choose or certify the correct HSN or SAC classification.

Reviewed by Dynamite Docs content team. Last verified 2026-09-11.

Understanding HSN and SAC codes in GST invoices

HSN codes are used for goods and SAC codes for services. Extraction solves a document problem: finding the printed code and associating it with the correct line or summary value. Classification is a separate tax decision. A clearly read code can still be wrong on the supplier document, outdated for the transaction, or inappropriate for the buyer’s treatment.

When a supplier embeds a value inside a description, such as “Industrial Valve [HSN-84818030] 25mm,” the output can keep the printed code in its own column while preserving the full source description. Avoid deleting the original text during cleanup. It gives the reviewer context when a number could be a model number, SKU, internal item code or tax classification.

Multi-page invoices need an additional tie-out. Confirm that every extracted code is linked to the correct line and that all line taxable values reconcile to the invoice subtotal or HSN summary. Repeated table headers should not become false items. Freight, discounts and other charges may appear outside the main table, so review whether the source assigns them a separate SAC, HSN or tax treatment.

For recurring suppliers, maintain an approved item-to-classification mapping outside the raw extraction. Compare the printed value with that mapping and report differences as exceptions. Do not silently overwrite the source field. A useful review table has separate columns for printed code, approved code, variance reason, reviewer and review date.

Dynamite Docs extracts classification codes as printed on invoices. It does not validate them against a tariff database, choose a tax rate, determine turnover-based disclosure requirements or prepare a return. Classification accuracy and filing remain under the guidance of your tax team or Chartered Accountant.

Accurate line-item extraction with full model choice

Every signed-in tier can connect a supported provider key, and local Ollama is available on the applicable paid plan. Choose the processing route that fits the document quality and your data policy.

Digital PDFs may expose embedded text, while paper scans and mobile photos need visual extraction. Dense tables and small classification codes still require source review.

Reviewed classification rows can be exported to Excel, CSV or JSON, or pushed to Google Sheets when connected. Free and Hobby own-key pages use monthly PE; Pro and Ultra own-key runs do not consume PE.

Questions, answered

When is 6-digit HSN reporting required?

Under GST guidelines, businesses with annual aggregate turnover exceeding ₹5 Crore in the preceding financial year report 6-digit HSN/SAC codes on B2B invoices. Businesses with turnover up to ₹5 Crore report at least 4 digits.

How does the extractor handle HSN codes printed inside product descriptions?

The extractor can separate a visible 4, 6 or 8-digit tariff number from the surrounding description. Review the source context so a SKU, model number or quantity is not mistaken for an HSN value.

How are service codes (SAC) distinguished from goods HSN codes?

The extractor records the printed code and nearby label. It should not classify a line solely from a number pattern. Confirm whether the source describes goods or services and refer uncertain cases to your tax reviewer.

Can extracted HSN data assist with GSTR-1 Table 12 preparation?

The export can provide HSN or SAC, description, quantity and taxable value fields for a review schedule. Your filing process must confirm the applicable schema, aggregate the data correctly and validate it before submission.