Most billing problems in Coimbatore businesses are not about printing an invoice. They are about what happens after: the e-invoice that failed because the buyer's GSTIN was keyed wrongly, the e-way bill raised on a separate portal with a different quantity, the GSTR-1 that does not match the sales register because credit notes were passed in a second system. GST billing software should remove these reconciliation jobs, not add to them.
ERPNext with the India Compliance app is a complete GST accounting system, not a billing add-on. The invoice you print is the same record that generates the IRN, the e-way bill, the stock movement, the receivable and the GSTR-1 line. Thirvusoft implements and supports it for traders, retailers, manufacturers and service companies across Coimbatore and Tamil Nadu.
What the GST billing system does
The India Compliance app sits on top of ERPNext's Accounts module and handles the Indian tax layer end to end. Tax templates apply CGST and SGST or IGST automatically from the place of supply; HSN or SAC codes are held on the item master; and the invoice carries everything the e-invoice schema asks for. Everything below is produced from that one sales invoice, without re-entry on a portal.
- E-invoice: IRN and QR code generated from the invoice, with cancellation handled in the system
- E-way bill: generated for invoices, delivery notes and stock transfers, with vehicle and transporter details
- GSTR-1 and GSTR-3B: return-ready data with B2B, B2C, credit note and export sections
- HSN-wise summary of outward supplies for the return
- TDS: deduction and ledger on supplier payments
- Credit and debit notes linked to the original invoice, so returns and rate corrections flow into the return
Multi-branch billing under several GSTINs
A paints dealer with a godown in Peelamedu and a counter in Pollachi, or a manufacturer with a registered unit in Coimbatore and a depot in Chennai, needs invoices raised under the correct GSTIN with the right series and the right tax treatment for inter-branch movement. ERPNext holds each registration on the company record, assigns an invoice series per branch and treats stock transfers between registrations as taxable supplies with their own e-way bills.
Returns are then prepared per registration while the group keeps one set of books, one item master and one customer list. Thirvusoft's retail clients include Cycle World (franchise retail), SAM Home Appliances and Sun Metal, and Senbagam Paints in the paints trade.
Counter sales and POS billing
For retail counters, ERPNext's point-of-sale screen works on a touch screen or a tablet, prints a compact GST invoice, accepts cash, card and UPI in split payments and keeps working when the internet drops, syncing when it returns. Each POS session closes with a cash reconciliation, and the day's sales post to the ledger as consolidated or individual invoices, whichever you prefer.
Barcode scanning, customer-wise pricing, loyalty points and returns against the original bill are standard. B2C invoices feed the same HSN summaries and GSTR-1 sections, so a shop that also does B2B billing does not run two systems. Razorpay payment links can be sent for advance collection.
Send invoices on WhatsApp and get paid sooner
Thirvusoft's WhatsApp integration sends the PDF invoice, with the e-invoice QR code printed on it, to the customer's number the moment it is submitted, together with the e-way bill where one applies. Payment reminders for overdue invoices go out on a schedule you set, and a Razorpay link can be attached for the balance.
For a wholesaler raising a few hundred invoices a day, this removes the phone calls asking for a copy of the bill, and the accounts team sees receipts matched against invoices without re-keying anything.
Who it suits in Coimbatore and Tamil Nadu
The system fits any GST-registered business, but the businesses that gain most are those with several branches, high invoice volumes or stock that must reconcile with sales. Thirvusoft's clients include Global Safety Enterprises (safety equipment), Kavya Transports (logistics) and Sky Broking (trading), alongside manufacturers who invoice from ERPNext production.
- Traders and distributors billing dealers on credit terms with an e-way bill on every dispatch
- Retail chains that need POS billing and B2B billing in one book
- Manufacturers issuing e-invoices, job-work challans and delivery notes
- Service companies billing on SAC codes with TDS deducted by their clients
- Transport and logistics companies raising invoices with e-way bill details
Setting it up: from your current data to the first e-invoice
A GST billing implementation for a trading or service company is usually live in 4–8 weeks. The steps are the same whether you come from Tally, Excel or another billing package, and the print format is matched to your existing invoice so customers see no change.
- Discover: map your GSTINs, invoice series, item HSN codes and tax rates
- Configure: company, branches, tax templates and print formats
- Migrate: customers, suppliers, items, opening stock and receivables from Tally or Excel
- Connect: e-invoice and e-way bill credentials, WhatsApp and Razorpay
- Train: billing and accounts staff, role by role, in Tamil or English at your office
- Go live: run the first month with hyper-care, then move to an AMC