Guides: moving from Tally, filing GSTR-1 & GSTR-3B, e-invoicing & more

• Migration

  Migrate from Tally to 399Apps

  To move from Tally to 399Apps, export your masters (ledgers, parties and stock items), opening balances and outstanding invoices from TallyPrime to Excel/CSV, clean the sheets, then import them into Nidhi Books and reconcile against your Tally trial balance. Pick a clean cut-over date — usually a month or quarter start — and run both systems in parallel for one cycle before going fully live. Guided onboarding support is available for larger datasets.

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• Migration

  Migrate from Marg ERP to 399Apps

  To move from Marg ERP to 399Apps, export your masters (parties, items and stock), opening balances and outstanding invoices from Marg to Excel/CSV, clean the sheets, then import them into Nidhi Books and reconcile against your Marg trial balance and stock report. Pick a clean cut-over date — usually a month or quarter start — and run both systems in parallel for one cycle before going fully live. Guided onboarding support is available for larger datasets.

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• GST returns

  How to file GSTR-1

  GSTR-1 is the monthly or quarterly GST return where you report all outward supplies (sales). To file it, log in to the GST portal, open the Returns Dashboard, select the period, add your B2B, B2C, export and credit/debit-note details (or upload them in bulk), generate the summary, then submit with a DSC or EVC.

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• GST returns

  How to file GSTR-3B

  GSTR-3B is the monthly self-assessed summary return where you declare total outward supplies, the input tax credit (ITC) you claim and the net GST payable. To file it, log in to the GST portal, open the GSTR-3B tile for the period, verify the auto-filled values, offset your liability with ITC and cash, then submit with a DSC or EVC.

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• GST compliance

  What is e-invoicing under GST

  E-invoicing under GST is the system where B2B invoices are uploaded to a government Invoice Registration Portal (IRP), which validates them and returns a unique Invoice Reference Number (IRN) and a digitally signed QR code. It is mandatory for businesses whose annual aggregate turnover exceeds ₹5 crore in any year since 2017-18.

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• GST compliance

  GST late fees & interest

  If you file a GST return after the due date, you pay a late fee of ₹50 per day (₹20 per day for nil returns), split equally between CGST and SGST, plus 18% annual interest on any tax paid late. Late fees are capped based on your turnover and the type of return, so they do not grow without limit.

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• GST billing

  GST invoice format

  A GST tax invoice must show the supplier’s and recipient’s name, address and GSTIN, a unique consecutive invoice number (up to 16 characters) and date, the HSN/SAC code, item description, quantity, taxable value, the GST rate and amount split into CGST/SGST or IGST, the place of supply, and the supplier’s signature or digital signature.

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Looking for quick answers instead? See our GST & software answers or GST glossary.