Do You Actually Need to Register for GST?
The short answer: if your annual turnover crosses ₹40 lakh (for goods) or ₹20 lakh (for services), registration is mandatory. For traders doing interstate supply - even below that threshold - registration is compulsory regardless of turnover.
Where Patna businesses often get this wrong: they cross the threshold mid-year and don't register for another 6 months. The penalty for late registration is 10% of the tax due, minimum ₹10,000. It adds up quickly.
If you're a retailer, distributor, or manufacturer in Bihar and you're unsure whether you've crossed the limit - add up your last 12 months of sales. If it's anywhere near ₹35 lakh, get registered now.
What the Registration Process Actually Looks Like
GST registration in Bihar is entirely online through the GST portal. You'll need: PAN card, Aadhaar, proof of business address (rent agreement or utility bill), bank account details, and a photograph of the owner.
The application is reviewed within 7 working days. If your documents are clean and complete, approval comes through without a site visit. If anything is missing or mismatched - say your PAN address doesn't match your shop address - you'll get a notice asking for clarification, which delays everything by another 7–10 days.
The most common document issue we see with Patna traders: using a home address as the business address when the actual godown or shop is different. Get this right upfront.
Monthly Filing Without the Last-Minute Rush
GSTR-1 (outward sales) is due by the 11th of every month. GSTR-3B (summary return and payment) is due by the 20th. Miss either, and interest at 18% per annum starts accruing from the due date.
The businesses that never stress about filing have one thing in common: their billing software generates GST-ready invoices throughout the month. By the time the 11th arrives, their data is already organised. The ones who stress are those still working from physical bill books and typing totals manually the night before the deadline.
If you're doing more than 50 invoices a month, GST-compliant billing software pays for itself in the first month of late-fee savings alone.
Input Tax Credit: The Part Most Traders Miss
Every rupee of GST you've paid on purchases (raw materials, packaging, services) can be claimed back against your output tax - this is Input Tax Credit (ITC). But you can only claim it if your supplier has correctly filed their returns and their invoice appears in your GSTR-2B.
We've seen Patna distributors lose ₹15,000–₹40,000 per year in unclaimed ITC simply because they never checked GSTR-2B against their purchase register. Check it every month before filing your 3B.