How to prepare and file your GSTR-3B in Aczen Bilz

Step-by-step guide to preparing and filing your GSTR-3B return using auto-populated data from invoices and purchase bills in Aczen Bilz.

GSTR-3B is the monthly self-declaration return where you report your outward supplies, claim input tax credit (ITC), and pay net GST. Aczen Bilz auto-populates every section of the return from the invoices and purchase bills you have already recorded, so filing becomes a matter of reviewing, reconciling, and downloading — not data entry.

Always review the auto-populated figures before filing. Once you submit GSTR-3B on the GST portal, amendments are limited. Errors in ITC claims or outward supply values can attract notices or demand of tax with interest.

Filing workflow

1. Navigate to GSTR-3B

   Go to Compliance → GST Compliance in the sidebar, then select the GSTR-3B tab. You will see the summary view with date-range filters at the top.

2. Select the filing period

   Use the date-range picker to set the start and end dates for the period you are filing. For a monthly return, select the first and last day of that month (for example, 1 April – 30 April). The summary figures update instantly.

3. Review auto-populated data

   Aczen Bilz populates four sections from your records:

   Section	Source
   Outward supplies	Sales invoices raised in the period, net of credit notes
   Inward supplies (ITC)	Purchase bills recorded in the period, net of debit notes
   Reverse charge (RCM)	Expenses marked as RCM in your expense tracker
   Exempted / Nil-rated / Non-GST	Invoice line items classified as exempt, nil-rated, or non-GST

   Check that the taxable value and GST amounts in each section match what you expect. If a figure looks wrong, navigate to the relevant invoices or bills and correct them before proceeding.

4. Check the ITC mismatch centre

   Before claiming ITC, compare your purchase records against what your suppliers have filed. Go to the ITC Match tab in GST Compliance. Aczen Bilz shows:

   • GSTR-2A — supplier-wise purchase details pulled from your bills
   • GSTR-2B — auto-drafted ITC summary (IGST, CGST, SGST, CESS)

   Any discrepancy between the two is flagged. For each mismatch, you can either:

   • Correct your bill — if you entered an amount or GSTIN incorrectly
   • Contact the supplier — if they have not filed their GSTR-1 yet or filed with an error
   • Exclude the ITC — if the credit is genuinely not claimable this period

   You can only claim ITC on purchases where your supplier has filed their GSTR-1 and the invoice appears in your GSTR-2B. Unmatched credits should not be claimed until the mismatch is resolved.

5. Review the liability summary

   The Summary panel at the bottom of the GSTR-3B tab shows:

   • Tax liability — output GST on outward supplies plus any RCM payable
   • ITC available — input GST from purchases plus RCM (claimable next period)
   • Net GST payable — Tax Liability minus ITC Available

   If you have a net payable amount, ensure your GST electronic cash ledger on the GST portal has sufficient balance before filing.

6. Download the return file

   Once you are satisfied with the figures, click Excel to download a CSV or JSON to download a JSON file. Both formats are structured for direct upload to the GST portal.

   JSON

   The JSON file follows the GST portal’s GSTR-3B schema. Use this if your portal supports direct JSON upload. The file includes your period dates and all section values.

   Excel / CSV

   The CSV is formatted with one row per GSTR-3B section and is suitable for manual entry verification or upload via the offline tool provided by the GST portal.

7. Upload and file on the GST portal

   Log in to www.gst.gov.in, navigate to Returns → GSTR-3B, select the filing period, and upload the JSON or enter the values from the CSV. Submit and make payment if a net liability is due.

   After filing, note your Acknowledgement Reference Number (ARN) — you can record this in Aczen Bilz against the period for your own records.

What is auto-populated and what is not

Auto-populated by Aczen Bilz

• Outward taxable supplies (net of credit notes)
• ITC from purchase bills (net of debit notes)
• Reverse charge amounts from RCM expenses
• Exempt, nil-rated, and non-GST supply values
• Net GST payable calculation

You need to verify or add

• Import of goods or services (IGST paid at customs)
• ITC from Input Service Distributors (ISD)
• Supplies through e-commerce operators (Section 9(5))
• Inter-state supplies to unregistered or composition dealers

Handling common mismatches

Supplier has not filed their GSTR-1 yet

The invoice will not appear in your GSTR-2B. You cannot claim the ITC this period. Either defer the credit to next month or contact the supplier and ask them to file before the GSTR-2B cut-off date (typically the 14th of the following month).

Supplier filed with a different invoice amount

The taxable value or GST amount in GSTR-2B will differ from your bill. Check the original invoice from the supplier. If your bill is wrong, edit it in Aczen Bilz. If the supplier’s filing is wrong, ask them to file an amendment in their next GSTR-1.

GSTIN on bill is incorrect

If you recorded the wrong supplier GSTIN, the system cannot match the credit. Edit the purchase bill in Aczen Bilz with the correct GSTIN and re-run the ITC match.

Credit note reduces ITC below zero

If you return goods and the supplier issues a credit note, Aczen Bilz deducts the associated ITC. If this brings your net ITC negative for the period, review whether the credit note was correctly recorded and whether the original bill’s ITC had already been claimed in a prior period.

GSTR-3B filing deadlines

Taxpayer type	Due date
Monthly filers (turnover above ₹5 crore)	20th of the following month
Quarterly filers — Category 1 states	22nd of the month following the quarter
Quarterly filers — Category 2 states	24th of the month following the quarter

The compliance calendar in Aczen Bilz shows your next GSTR-3B due date and sends reminders 7 days before the deadline. See the compliance calendar page for details.