GSTINs, state codes, place of supply, HSN and SAC codes, and CGST + SGST or IGST on every line, checked as you bill. Then GSTR-1 and GSTR-3B are prepared from the same invoices, so your returns match what you charged.
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GST billing software creates tax invoices that meet India's GST rules, works out CGST and SGST or IGST, and keeps the records your GST returns are built from.
The test of good GST billing software is what happens at month end. If your invoices already carry the right GSTINs, places of supply and tax types, GSTR-1 is a download, not a week of fixing. That is what PikZiy Books is built for. For billing more generally, see billing software.
CGST + SGST charged to a customer in another state, or IGST within your own. Both are wrong, and both need a credit note to fix.
A Pune studio bills a Coimbatore client ₹1,20,000 + CGST 9% + SGST 9%. It should have been IGST 18%.
One character off, and your customer's input tax credit does not show in their GSTR-2B. They will ask you to amend the invoice.
27AACCK4821M1Z2 for 27AACCK4821M1ZC: the check character at the end gives it away.
Sales are copied into a spreadsheet, sorted into B2B, B2CL and B2CS by hand, and the HSN summary is guessed.
Two days of every month spent on GSTR-1, and the HSN table still doesn't add up.
Enter who is selling to whom. The checker validates GSTINs, works out the place of supply and the tax, tells you which GSTR-1 table the invoice belongs in, and whether you need an e-invoice.
Nothing you type here is saved or sent. General guidance from the GST rules as of October 2026, not tax advice.
Read the rules behind it: GST invoice format in India and CGST, SGST and IGST explained.
Screenshots of the real app with a sample business, Ember & Oak Studio in Pune, Maharashtra.
Pick saved items with their HSN or SAC code and tax, or type a line. If the taxes you chose do not fit the customer's state, PikZiy Books says so before you save.
Both GSTINs, state names with their codes, HSN or SAC on each line, the tax by type and the place of supply. The same layout is the PDF, the print and the page your customer opens.
Your invoices and credit notes for the month, sorted into the GSTR-1 tables. Checks list anything to fix first: GSTINs, places of supply, tax types, HSN codes and rupee values.
The figures for each GSTR-3B table, worked out from your invoices, credit notes and bills. Upload GSTR-2B from the portal and PikZiy Books matches it with your bills before you claim credit.
Rule 46 lists what a GST tax invoice must contain. Here is each item, and how PikZiy Books handles it today. We would rather you know the gaps than find them later.
| What the rule asks for | In PikZiy Books |
|---|---|
| Your name, address and GSTIN | Shown on every invoice, labelled GSTIN |
| A consecutive serial number, unique for the financial year, up to 16 characters | Your own prefix and number series; change the prefix each year, e.g. INV/26-27/ |
| Date of issue | Shown; the number is given on the day you issue |
| Customer's name, address and GSTIN | Shown, with the state name and code |
| For unregistered customers from ₹50,000: name, address, state and code | Shown from the customer record |
| HSN code for goods, SAC for services | On each line, from the item or typed |
| Description, quantity and unit | On each line |
| Total and taxable value after discount | Shown, with the discount |
| Rate and amount of CGST, SGST/UTGST, IGST and cess | On each line and in the totals |
| Place of supply, with the state's name, for inter-state supplies | Shown on every invoice, e.g. 33-Tamil Nadu |
| Delivery address, if different | Ship-to address from the customer record |
| Whether tax is payable under reverse charge | Not yet: sales cannot be marked as reverse charge |
| Signature or digital signature of the supplier | Not yet: sign the PDF if your customer needs it |
CGST, SGST or UTGST, IGST and cess on each line, with HSN or SAC codes.
A warning when the tax type does not fit your customer's state.
From the GSTIN or state, the same value GSTR-1 uses.
Both parties' GSTINs, and each state with its two-digit code.
Invoices in other currencies; EXP in GSTR-1 with shipping bill details.
Kept apart and reported in their own GSTR-1 table.
Checks first, then a CSV for each table for the GST offline tool.
Growth plan and aboveEach table's figures from your invoices, credit notes and bills.
Growth plan and aboveUpload the JSON from the portal; see matched, different and missing bills.
Growth plan and aboveSupplier bills with their GSTIN and tax, for input credit.
Business plan and aboveOutput and input CGST, SGST and IGST posted to your books.
Business plan and aboveInvite your accountant to work on the returns with their own login.
Growth plan and aboveGST invoices are on every plan. The returns are on Growth and above; purchase bills and full books on Business.
| Feature | Starter | Growth | Business | Enterprise |
|---|---|---|---|---|
| People who can sign in | 1 | 3 | 10 | 25 |
| GST invoices, quotes and credit notes | Included | Included | Included | Included |
| GSTINs, state codes and place of supply | Included | Included | Included | Included |
| HSN and SAC codes, cess and exports | Included | Included | Included | Included |
| GSTR-1, GSTR-3B and GSTR-2B matching | Not included | Included | Included | Included |
| Reports for any period | Not included | Included | Included | Included |
| Purchase bills with input GST | Not included | Not included | Included | Included |
| Double-entry accounting | Not included | Not included | Included | Included |
Every plan has unlimited invoices, customers and items, and starts with a 14-day free trial. Prices are published when sign-ups open in November 2026. Businesses that sign up from 1 November 2026 to 30 April 2027 and pay for a year get 18 months for the price of 12. Compare every feature
GST billing software creates tax invoices that meet India's GST rules: your GSTIN and your customer's, HSN or SAC codes, the place of supply, and CGST and SGST or IGST worked out on each line. Good GST billing software also uses those invoices to prepare your GST returns, so the figures in GSTR-1 and GSTR-3B match what you billed.
You choose the taxes on each line, and PikZiy Books checks them. If your customer is in another state and you chose CGST + SGST, or in your state and you chose IGST, it warns you before you save. The GSTR-1 checks then flag any invoice where the tax type and place of supply disagree. For the rules, read CGST, SGST and IGST explained.
From your customer's GSTIN, whose first two digits are the state code, or from their state if they are not registered. The invoice shows it as, for example, 33-Tamil Nadu, and the GSTR-1 file uses exactly the same value. Customers outside India are exports, with place of supply 96.
No. It prepares them: GSTR-1 as CSV files for each table, ready for the GST offline tool, and GSTR-3B as a worksheet with the figures for each table. It also matches your purchase bills with the GSTR-2B file you download from the portal. You or your CA then file on the GST portal. See GSTR-1 explained and GSTR-3B explained.
Not yet. Both are coming soon. If your aggregate turnover has crossed ₹5 crore in any year since 2017-18, your B2B invoices must be reported to the Invoice Registration Portal for an IRN and QR code, and PikZiy Books cannot do that for you yet.
Yes. Save the HSN or SAC code with each item and it comes onto every invoice line, where you can change it. A line can carry up to three taxes, so cess can sit beside GST. GSTR-1 builds the HSN summary from the same codes. Unsure of a code? Read HSN vs SAC codes.
Choose their state on the customer. Within your state they pay CGST + SGST; in another state, IGST. GSTR-1 puts inter-state invoices above ₹1 lakh in B2CL and the rest in B2CS, by state and rate, as the rules ask.
Yes. Invoice customers abroad in their currency. In GSTR-1 they go to the EXP table, with or without IGST, and you add the shipping bill number and date where there is one, and the rupee rate.
Issue a credit note against it. Issued invoices are locked so your copy always matches your customer's, and credit notes go into GSTR-1 as CDNR or CDNUR. See common GST mistakes.
Invoices carry the details Rule 46 of the CGST Rules asks for, with two gaps listed on this page: there is no signature line yet, and sales under reverse charge are not marked. The returns are prepared from your invoices and checked, but filing and the final review stay with you or your CA.
PikZiy Books opens for sign-ups in November 2026. Join the waitlist and we will tell you the day you can start.
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