How many HSN digits do I need on an invoice?

With aggregate turnover up to ₹5 crore in the preceding year, 4 digits. Above ₹5 crore, 6 digits. Up to ₹5 crore, HSN may be left off invoices to unregistered customers.

When do I charge IGST instead of CGST and SGST?

When your location and the place of supply are in different states or union territories. In the same state, the rate splits half and half into CGST and SGST, or UTGST in a union territory without a legislature.

What details do I need for an unregistered customer?

When the taxable value is ₹50,000 or more: their name and address, the delivery address, and the state’s name and code. Below ₹50,000, only if the customer asks for them.

How many copies of an invoice do I need?

For goods, three: original for recipient, duplicate for transporter and triplicate for supplier. For services, two: original for recipient and duplicate for supplier. Choose “All copies” before you print, and each copy prints on its own page with its marking.

Does a GST invoice need a signature?

Yes, the signature or digital signature of the supplier or an authorised representative. The rules don’t ask for one on an electronic invoice issued under the IT Act. A printed copy from here has a space for you to sign.

Can I use this if e-invoicing applies to my business?

Not for invoices to registered customers. Where e-invoicing applies, an invoice issued any other way is not treated as an invoice. The generator warns you when you choose a turnover over ₹5 crore.

Is what I type saved or sent anywhere?

No. The invoice is made in your browser and nothing is sent. Your own details are kept on this device only if you tick “Remember my details”, and you can untick it to forget them.

Can PrimoERP make my invoices for me?

Yes. In PrimoERP each invoice carries its GST, with the place of supply set from both GSTINs, and each e-invoice is reported to the IRP from your books, with its IRN and QR code printed on it.

GST Invoice Generator and Format (Excel, PDF)

Make your GST invoice

See the document

Document

Invoice number

Up to 16 letters, numbers, - or /, unique for the financial year.

Invoice date

Payment due (optional)

Supply of

Tax on reverse charge

Yes when the customer, not you, pays the GST on this supply.

Your turnover last year

Aggregate turnover in the preceding financial year. It sets the HSN digits: 4, or 6 over ₹5 crore.

Your business (supplier)

Logo (optional)

Logo

Shown on the document only. It stays in this browser tab.

Name

Address

GSTIN

15 characters. The format and check digit are checked here.

State

Phone (optional)

Email (optional)

Your name, address, GSTIN, contact and bank details are kept in this browser only. Untick to forget them.

Customer (recipient)

Is the customer registered under GST?

For an unregistered customer, the GSTIN is left off.

Name

Address

GSTIN

15 characters. The format and check digit are checked here.

State

Ship to

Place of supply

Where it differs from your state, IGST applies instead of CGST and SGST.

Items

Item 1
Description
HSN/SAC
Qty
Unit
Rate (₹)
Disc. %
GST %
Cess %
Line total₹43,660.00
Item 2
Description
HSN/SAC
Qty
Unit
Rate (₹)
Disc. %
GST %
Cess %
Line total₹6,637.50
Item 3
Description
HSN/SAC
Qty
Unit
Rate (₹)
Disc. %
GST %
Cess %
Line total₹2,360.00

Totals and notes

Bank details for payment (optional)

Terms and conditions (optional)

Notes (optional)

Before you send it

Done: Your name, address and GSTINRule 46(a)
Done: Invoice number: up to 16 letters, numbers, - or /Rule 46(b)
Done: Date of issueRule 46(c)
Done: Customer’s name, address and GSTINRule 46(d)
Done: HSN or SAC on every item, with the digits your turnover needsRule 46(g), Notification 78/2020
Done: A description on every itemRule 46(h)
Done: Quantity and unit on every item of goodsRule 46(i)
Done: Total value, and taxable value after discountRule 46(j), (k)
Done: Rate and amount of each taxRule 46(l), (m)
Done: Place of supply, with the stateRule 46(n)
Done: Delivery address where it differs, with its stateRule 46(o)
Done: Whether tax is payable on reverse chargeRule 46(p)
Done: Your signature: sign the printed copyRule 46(q)
Done: Each GSTIN starts with its state’s codeGSTIN format

Every field the rule asks for is filled in.

Total

₹52,658.00

Taxable value: ₹44,625.00
GSTCGST + SGST: ₹8,032.50
Round off: ₹0.50

Rupees Fifty-Two Thousand Six Hundred Fifty-Eight Only

Worked out in your browser. Nothing you type is sent or saved, unless you tick “Remember”.

Opens your browser’s print window. Choose “Save as PDF”.

An .xlsx file with live formulas and spare rows, to use as a template.

Copies

Navkar Office Systems

204, Sakar Complex, Ashram RoadAhmedabad 380009

GSTIN: 24AACCS1234F1ZW

State: 24 · Gujarat

[email protected]

Tax invoice

Original for recipient

Invoice number: INV/26-27/0148
Invoice date: 17 Oct 2026
Place of supply: 24 · Gujarat
Tax payable on reverse charge: No

Bill to

Kavya Design Studio LLP

12, Shivalik Plaza, IIM RoadAhmedabad 380015

GSTIN: 24AAJFS1357Q1ZO

State: 24 · Gujarat

#	Description	HSN/SAC	Qty	Rate	Disc.	Taxable value	CGST	SGST	Total
1	Laser printer, mono, A4	8443	2 NOS	18,500.00		37,000.00	9%3,330.00	9%3,330.00	43,660.00
2	Toner cartridge	8443	5 NOS	1,250.00	10%	5,625.00	9%506.25	9%506.25	6,637.50
3	Installation and set-up	9987	1 JOB	2,000.00		2,000.00	9%180.00	9%180.00	2,360.00

Amount in words

Rupees Fifty-Two Thousand Six Hundred Fifty-Eight Only

Bank details

Navkar Office SystemsA/c 000123456789 · IFSC ABCD0001234

Terms and conditions

Payment within 15 days of the invoice date.

Amount: 45,250.00
Less discount: −625.00
Taxable value: 44,625.00
CGST: 4,016.25
SGST: 4,016.25
Round off: 0.50
Total: ₹52,658.00

What a tax invoice must show.

The rules the generator follows, from the CGST Rules and Acts as amended, on CBIC’s own copy.

A tax invoice shows the supplier’s name, address and GSTIN, a serial number, the date of issue, and the recipient’s name, address and GSTIN or UIN if the recipient is registered.
Source: CGST Rules 2017, rule 46(a)–(d) (CBIC), checked 17 Oct 2026
The serial number is consecutive and up to 16 characters, in one or more series. It may use letters, numbers, a hyphen or a slash, and must be unique for the financial year.
Source: CGST Rules 2017, rule 46(b) (CBIC), checked 17 Oct 2026
For an unregistered recipient, the name and address, the delivery address and the state’s name and code are needed when the taxable value is ₹50,000 or more. Below that, only if the recipient asks.
Source: CGST Rules 2017, rule 46(e), (f) (CBIC), checked 17 Oct 2026
Each item shows its HSN code, a description, and for goods the quantity and unit. The invoice shows the total value and the taxable value after any discount.
Source: CGST Rules 2017, rule 46(g)–(k) (CBIC), checked 17 Oct 2026
HSN needs 4 digits with aggregate turnover up to ₹5 crore in the preceding year, and 6 digits above that, from 1 April 2021. Up to ₹5 crore, it may be left off invoices to unregistered persons.
Source: Notification 78/2020-Central Tax (GST Council), checked 17 Oct 2026
The rate and amount of each tax are shown: central tax, state tax, integrated tax, union territory tax and cess.
Source: CGST Rules 2017, rule 46(l), (m) (CBIC), checked 17 Oct 2026
A supply is inter-state when the supplier’s location and the place of supply are in different states or union territories, and intra-state when they are in the same one.
Source: IGST Act 2017, sections 7 and 8 (CBIC), checked 17 Oct 2026
An inter-state invoice shows the place of supply with the state’s name. Every invoice shows the delivery address where it differs from the place of supply, whether tax is on reverse charge, and the supplier’s signature or digital signature.
Source: CGST Rules 2017, rule 46(n)–(q) (CBIC), checked 17 Oct 2026
A discount given before or at the time of supply is left out of the value, if it is recorded on the invoice.
Source: CGST Act 2017, section 15(3)(a) (CBIC), checked 17 Oct 2026
For goods, the invoice is made in triplicate: original for recipient, duplicate for transporter, triplicate for supplier. For services, in duplicate.
Source: CGST Rules 2017, rule 48(1), (2) (CBIC), checked 17 Oct 2026
E-invoicing applies to businesses with aggregate turnover of more than ₹5 crore, from 1 August 2023.
Source: Notification 10/2023-Central Tax (GST Council), checked 17 Oct 2026

Where the rule is silent

How many fields there are. Rule 46 lists 17 particulars, (a) to (q). Two more, (r) and (s), apply only around e-invoicing. Lists that say 16 count (e) and (f), the two cases of an unregistered customer, as one.
“Total value” and “taxable value”. The rule asks for both but doesn’t define total value. The invoice shows the amount before discount, the discount, the taxable value and the total with tax, so either reading is covered.
How tax is rounded. The rule doesn’t say. The generator works out the tax on each line and rounds it to the paisa. Rounding the total to the rupee is your choice, and shows as its own line.
Your serial numbers. Nothing is saved, so the generator can’t see your earlier invoices. Keep each series unique within the financial year yourself.

One invoice, line by line.

Two printers, five toner cartridges at 10% off and an installation, from a supplier in Ahmedabad to a registered customer in Ahmedabad.

Laser printers, 2 × ₹18,500: 37,000
Toner cartridges, 5 × ₹1,250less 10%: 5,625
Installation: 2,000
Taxable value: 44,625
CGST at 9%half of 18%: 4,016.25
SGST at 9%: 4,016.25
Round off: 0.50
Invoice total, ₹: 52,658

Both are in Gujarat, so the 18% splits into CGST and SGST. In words: Rupees Fifty-Two Thousand Six Hundred Fifty-Eight Only.

An illustration: the names, addresses and GSTINs are made up, and the 18% rate is for the example only. Check the rate for your own item.

What it does not do.

Check these before you rely on an invoice made here.

E-invoices, IRN and QR code
The generator doesn’t report invoices to the IRP, so there is no IRN or QR code. Over the e-invoicing limit, use your e-invoicing software for invoices to registered customers.
Where e-invoicing applies, an invoice issued any other way is not treated as an invoice.
Source: CGST Rules 2017, rule 48(5) (CBIC), checked 17 Oct 2026
Exports and SEZ supplies
The export or SEZ endorsement and the country of destination aren’t added, and the tax split here goes by states only.
A supply to or by an SEZ developer or unit is inter-state, wherever the SEZ is.
Source: IGST Act 2017, section 7(5)(b) (CBIC), checked 17 Oct 2026
Bills of supply
The generator makes a tax invoice only. Exempt supplies and composition dealers need a bill of supply instead.
A supplier of exempt goods or services, or one paying tax under the composition scheme, issues a bill of supply instead of a tax invoice.
Source: CGST Act 2017, section 31(3)(c) (CBIC), checked 17 Oct 2026
Credit and debit notes
To change an invoice once it’s issued, you issue a credit or debit note. The generator doesn’t make them.
A discount given after the supply is left out of the value only if a credit note is issued and the recipient reverses the input tax credit on it.
Source: CGST Act 2017, section 15(3)(b) (CBIC), checked 17 Oct 2026
Cess by quantity
Cess is worked out as a percentage of the taxable value. A cess charged per unit, or partly per unit, isn’t.
A record of your invoices
Nothing is saved, so there is no invoice register and no automatic next number. Keep a copy of every invoice you issue.

Invoices that file your GST for you.

In PrimoERP each invoice carries its GST into your books, so your return figures are already there.

Sales and invoicingA quote becomes an order, the order becomes an invoice, and the payment closes it.Read more GST accounting softwareEvery invoice and bill carries its GST, split into CGST and SGST or IGST.Read more GST e-invoicingEach invoice reported to the IRP, with its IRN and QR code printed for you.Read more ERP for service businessesTimesheets, retainers and invoices that match the work.Read more

GST invoice questions people ask.

1.

What is the format of a GST invoice?

There is no set layout. Rule 46 of the CGST Rules lists what a tax invoice must show: your name, address and GSTIN, a serial number, the date, the customer’s details, HSN, description, quantity, value, taxable value, the rate and amount of each tax, the place of supply, the delivery address, reverse charge and a signature. This generator puts all of them on one A4 page.

— the PrimoERP team

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GST invoice generator with every field the rule asks for.

Make your GST invoice

Total

What a tax invoice must show.

One invoice, line by line.

What it does not do.

E-invoices, IRN and QR code

Exports and SEZ supplies

Bills of supply

Credit and debit notes

Cess by quantity

A record of your invoices

More invoices and documents tools.