GST billing & GSTR-1

“Is my bill GST-correct, and how do I get GSTR-1 to my CA without retyping every invoice?” In BizOS, GST follows your business’s registration, so a registered business prints a proper tax invoice every time with nobody choosing anything per bill. At the end of the month BizOS prepares GSTR-1 from the invoices and credit notes you issued, as the JSON file the GST portal takes and as CSVs for your CA. BizOS does not file the return. You or your CA upload it.

How do I make a GST invoice in BizOS?

Tax invoice, bill of supply or invoice?

You will only see BILL OF SUPPLY on an invoice issued before GST followed the registration, or one issued while the business was unregistered and kept after it registered. You can replace any title with your own in the template settings (see Invoice design).

Issued invoices keep what they were billed with. If you register for GST later, a draft picks up GST the next time it is saved, at the tax rates already on its lines. An invoice that was already issued without GST stays that way, because that is what the customer was billed.

CGST and SGST, or IGST?

BizOS compares the state code in your GSTIN (or the GSTIN of the branch issuing the bill) with the state code in the customer’s GSTIN:

• Same state: CGST + SGST, each half the tax. They are always equal, to the paisa.
• Different states: IGST.
• Customer has no GSTIN: BizOS treats the sale as within your state and charges CGST + SGST.

HSN and SAC codes

• The code is optional on every item. BizOS never refuses a save without one. Once stored it is 2 to 8 digits (HSN is 4, 6 or 8; SAC is 6).
• It is copied onto each line when the document is saved, so an issued invoice keeps the code that was true at the time. Add a code to an item later and the next edit of a document picks it up.
• The GST invoice templates print an HSN column and an HSN-wise tax summary. The simple templates do not.
• GSTR-1 warns about lines with no HSN or an HSN under 4 digits, and lists each one with a link to fix it.

Rates entered including GST

Many shops agree prices including GST (“the TV is ₹17,000”). With Type rates including GST on (Settings → Business → Profile & GST, shown once you are registered), the invoice and quotation editors on web and mobile take and show the rate, the ₹ discount and the amount including GST:

• On by default. Turn it off to type rates before GST.
• Entry only. BizOS always stores the rate before GST, so the PDF, GSTR-1, Tally and reports are unchanged. Turning it off or on never changes a saved document.
• Exact totals. ₹17,000 typed at 18% bills exactly ₹17,000.00 at any quantity: the pre-GST rate is stored without rounding.
• Changing the tax rate keeps the agreed price. Correct a line from 12% to 18% and the price including GST stays where the customer was promised it.

Pricing items as MRP is separate and lives on the item. See Pricing & price lists.

GST breakup or prices including GST on the PDF

A GST invoice or quotation can print two ways:

Set the default for customers under Settings → Selling → Document design → PDF for customers (Invoice and Quotation). Any single download can use the other style from the invoice’s PDF menu. WhatsApp sends and share links follow the template’s default.

Several GSTINs under one PAN

A business with a branch in another state needs a GST registration there. In BizOS these are branches inside one business, each trading under the business’s own GSTIN or another registration with the same PAN:

• Each branch prints its registration’s GSTIN, and the CGST/SGST or IGST split follows that registration.
• Advances taken under one GSTIN are not applied to bills under another.
• Stock sent to a branch on another GSTIN goes on a tax invoice from its own series (STI-), and appears in the sender’s GSTR-1 as a B2B sale.
• GSTR-1 and the accounting exports are prepared per GSTIN.

Registrations are added in Settings → Business → Branches & GST. The Branches add-on is set up by BizOS support. See Branches.

How do I export GSTR-1 from BizOS?

The mobile app shows the same preview under Reports → GST summary and can share both files.

What goes where

Amounts are worked out the way the customer’s PDF printed them, so the return adds up to the bills. A credit note reduces tax in its own month; the invoice is still reported in its month.

Must fix, Check and Note

• Must fix (blocks the download): your GSTIN is missing, or a bill made in Tally after BizOS took over that series is waiting for review (see Document numbering).
• Check: a line with no HSN or an HSN under 4 digits, a customer or business GSTIN whose check digit fails, a rate that is not a GST slab, a tax amount that does not match its lines, a credit note dated before its invoice, gaps in the number series.
• Note: for example the HSN was taken from the item, a draft is holding a number, or Tally is connected (your CA may be filing from Tally, so compare the two before uploading).

What BizOS does not do for GST (yet)

Be clear with your CA about this list:

• No filing. BizOS prepares GSTR-1. You or your CA upload and file it. BizOS does not prepare GSTR-3B.
• No e-invoice. BizOS does not generate an IRN or the e-invoice QR code.
• No e-way bill. Challans record the transporter and vehicle, and a stock transfer can carry an e-way bill number you made on the portal, but BizOS generates and files nothing.
• Sections not produced: exports and SEZ, deemed exports, reverse charge, advances (11A/11B), e-commerce, amendments and debit notes. B2CL and CDNUR stay empty because BizOS does not know an unregistered buyer’s state.
• No composition-scheme mode and no quarterly (QRMP) mode.
• The GST portal changes its JSON format from time to time. Before relying on an upload, compare one month’s file with the current offline tool.

Books, purchases and filing beyond this stay with your CA or Tally. BizOS works with Tally from day one, alongside first and then instead: see Tally and Accounting exports.

Who can change GST settings?

See Roles & permissions.