Ledger theme · Accountants · demo storeUse this theme All 150 themes

ITR deadline for audit cases is 31 October · Book a consultation this week

27 August 2026 · 2 min read · Nanavati Trivedi & Co.

GST for a new small business: the first ninety days

Registration, invoices and the first returns: what to set up before your first sale.

Most businesses selling goods need GST registration once turnover crosses ₹40 lakh a year, and service businesses at ₹20 lakh, with lower limits in some states. Selling online through a marketplace, or selling across state lines, usually requires registration from the first rupee.

Once registered, set up your invoices correctly. Each invoice needs your GSTIN, a serial number, the HSN or SAC code, the tax rate and the customer’s GSTIN for business sales. Billing software saves time, but a well-made spreadsheet works for the first months.

Your first returns will be GSTR-1, listing sales, and GSTR-3B, the summary with tax payment. Input tax credit on your purchases can only be claimed if your supplier has filed and the invoice appears in GSTR-2B, so check it every month.

Keep every purchase invoice, open a separate bank account for the business and pay tax on time. A small, regular routine in the first ninety days avoids most of the problems we see later.

Keep reading

More from the journal