Any GST-registered business
GST Invoice Format: What Every GST Bill Must Include
If you're registered for GST, every bill you issue has to carry a specific set of details — miss one and the invoice isn't valid for your customer's input tax credit. Here's what has to be on it, and what a correctly formatted one looks like.
What this bill must include
- Your business name, address, and GSTIN
- A unique, sequential invoice number, issued in order
- The invoice date
- Your customer's name and address, and their GSTIN if they're registered
- A clear description of each item or service
- The quantity and unit price of each item
- The GST rate applied to each item, shown separately
- The taxable value and the tax amount for each item
- The total invoice value, in figures
A worked example
Sharma Electricals
Bill to: Verma Traders
| Item | Qty | Rate | GST | Amount |
|---|---|---|---|---|
| AC gas top-up | 1 | ₹800 | 18% | ₹800 |
| Service call — 2 units | 2 | ₹600 | 18% | ₹1,200 |
Payment due within 7 days.
On tax
GST is calculated per line item, not on the invoice total — that's what lets a single bill mix items taxed at different rates (5%, 12%, 18%, 28%) without the maths going wrong. wbill calculates each line's tax automatically from the rate on the item and totals it for you.
Common mistakes
- Reusing an invoice number, or skipping one in the sequence
- Leaving the customer's GSTIN off a B2B sale, so they can't claim input tax credit
- Charging GST on the whole invoice instead of per item, which breaks once items have different rates
- A mistyped GSTIN — one wrong digit is enough to invalidate it
Or let wbill build this bill for you
Every field above, filled in automatically, totalled correctly, and sent on WhatsApp in seconds — from your phone.
Get early accessQuestions people ask
Do I need a GSTIN to use wbill?
No — wbill works for GST and non-GST businesses. Add a GSTIN to your business profile and it appears on every bill automatically.
What if my customer isn't GST-registered?
The bill is still valid — you just won't include their GSTIN, since they don't have one.
Can one invoice have items at different GST rates?
Yes — set the rate per item, and wbill totals each rate correctly on the same bill.
Does wbill file my GST returns?
No. wbill generates a correctly formatted bill; submitting returns is a separate step you’d handle with your accountant or GST software.
More formats in the bill format guides.