Free Retail Store Billing SOP for Indian Shops & Supermarkets (2025-26)

Every step of a GST-compliant bill in one PDF: tax invoice fields, B2B versus B2C rules, e-invoicing, MRP and discounts, payment reconciliation, returns, and day-end closing. Updated for FY 2025-26.

55+ billing procedures across 10 areas, from counter opening to day-end reconciliation
Every mandatory tax-invoice field under Rule 46, with HSN, CGST/SGST split, and rounding
The 7 billing mistakes that trigger GST notices, MRP penalties, and lost input credit, with fixes

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Petpooja presents

Retail Store Billing SOP

For Indian Shops & Supermarkets

55+

SOP items · 13-page PDF

FY 2025-26

What's Inside

Ten procedure areas covering every step at the counter

GST-Compliant Tax Invoice

Every mandatory field under Rule 46: GSTIN, sequential numbering, HSN codes, description, CGST/SGST shown separately, place of supply, and rounding to the nearest rupee.

B2B vs B2C Billing Rules

When to capture the buyer's GSTIN, the consolidated bill rule for small sales under ₹200, and the name and address needed on B2C sales of ₹50,000 or more.

E-Invoicing & E-Way Bills

Whether the ₹5 crore e-invoicing threshold applies to you, generating the IRN and signed QR code, and raising an e-way bill for goods movement above the value limit.

MRP, Pricing & Discounts

The Legal Metrology rule on never selling above MRP, why GST is not added on top of MRP, and the compliant way to handle on-bill and post-sale discounts under Section 15(3).

Payments & Reconciliation

Tagging cash, UPI, card, and wallet against each bill, the nil-MDR rule on UPI and RuPay, split payments, and tallying the drawer against system sales at day-end.

Returns, Credit Notes & Closing

Issuing a GST credit note for returns under Section 34, the 30 November deadline to declare it, the day-end Z-report, composition-dealer Bill of Supply, and record retention.

Why This Matters

A Bill Is Not Just a Receipt, It Is a Legal Document

A customer buys a mixer-grinder for ₹4,500 and pays by UPI. The cashier hands over a slip that clubs CGST and SGST into one line, skips the HSN code, and carries the same invoice number as the sale before it. Nothing looks wrong at the counter. On a GST audit, every one of those is a problem.

Retail billing in India is governed by more rules than most shop owners realise. The tax invoice format is set by Rule 46 of the CGST Rules. What you can charge is capped by the printed MRP under the Legal Metrology rules. How you reverse a sale is defined by Section 34. Break any of these quietly, at scale, across thousands of bills a month, and the exposure adds up fast.

The stakes changed again on 22 September 2025, when GST moved to two main slabs of 5% and 18%, plus a 40% rate on sin and luxury goods, and the old 12% and 28% slabs were removed. A store still billing an item at 28% or 12% is now overcharging customers and filing mismatched returns. It is one of the first things to check when comparing retail billing systems.

Most of these errors are not fraud. They are habit: a billing machine set up years ago, a cashier trained by the last cashier, no written procedure. When the person who "knows the billing" leaves, the knowledge leaves with them. That is exactly the gap a written procedure closes, whether you bill on a simple machine or dedicated retail billing software.

This SOP lays out every step, from counting the opening cash float to generating the day-end Z-report, in plain language a new cashier can follow. Each procedure cites the rule behind it (Rule 46, Section 34, Section 170, the Legal Metrology rules) so your team is not just following orders, but understands why the bill has to look the way it does.

Sample Preview

A few of the 55+ billing procedures inside

Here's a preview of what you'll get inside:

Invoice numbering: assign a unique, consecutive serial number up to 16 characters, with no gaps for the financial year, per Rule 46(b). A broken sequence is the first thing a GST officer checks.

Tax split: show CGST and SGST separately with the rate for a local sale, or IGST for an inter-state sale. Never club them into one "GST" line, per Rule 46(m).

B2B sales: capture the buyer's GSTIN and registered name before billing. Without it, a business customer cannot claim input tax credit and the bill has to be redone.

MRP rule: never charge above the printed MRP and never add GST on top of it. MRP already includes tax, per the Legal Metrology (Packaged Commodities) Rules, Rule 18(2).

Returns: reverse a returned sale with a GST credit note linked to the original invoice, declared by 30 November following the financial year, per Section 34. Not an informal cash return.

... plus counter opening, e-invoicing and e-way bills, payment reconciliation, composition-dealer Bill of Supply, and day-end closing across 10 procedure areas.

Key Stats

The numbers behind compliant retail billing

5 & 18%

GST now runs on two main slabs, 5% and 18%, plus a special 40% rate on select sin and luxury goods, after the 22 September 2025 reform. The old 12% and 28% slabs were removed, so any store still billing on them is overcharging and filing mismatched returns.

Source: GST reform effective 22-Sep-2025, Ministry of Finance (PIB)

₹5 crore

The aggregate turnover threshold above which e-invoicing is mandatory for B2B sales, effective since 1 August 2023. It does not apply to B2C counter sales, a distinction many retailers get wrong.

Source: Notification 10/2023-Central Tax, CBIC

83.4%

UPI's share of India's retail transaction volume in FY25, up from 79.4% the year before. Getting UPI confirmation and reconciliation right is now core to retail billing, not an afterthought.

Source: RBI Annual Report FY25

Common Mistakes

7 Retail Billing Mistakes Indian Shops Make

Charging an old GST rate after the September 2025 reform

Items that moved from 12% to 5% or from 28% to 18% must reflect the new slab. Billing at the old rate overcharges the customer and creates a mismatch between your bills and your GST return.

Clubbing CGST and SGST into one tax line

The two must appear separately, each with its rate and amount, under Rule 46(m). A single combined "GST" line does not meet the invoice rule and can be flagged on audit.

Skipping the GSTIN on a B2B sale

Without the buyer's GSTIN on the invoice, a business customer loses input tax credit. This is the most common reason a B2B bill has to be cancelled and reissued.

Selling above MRP or adding GST on top of MRP

MRP is the ceiling and already includes tax. Charging even ₹1 over MRP, or adding GST above it, is a Legal Metrology offence and the fastest route to a counter dispute and a penalty.

Handling returns as cash with no credit note

An informal cash return leaves the original tax unreversed in your books. Every return needs a GST credit note tied to the original invoice under Section 34, declared within the deadline.

Breaking the invoice serial number sequence

Gaps, duplicates, or a mid-year restart with no documented new series are all red flags. A clean, continuous numbering is the single strongest signal of an honest billing system.

Adding a surcharge for UPI or RuPay payments

The merchant discount rate on UPI and RuPay debit cards is currently nil by law, so there is no cost to pass on. Charging the customer extra to pay by UPI is not allowed and simply drives them away.

Comparison

Retail Billing: Without an SOP vs With This SOP

Aspect	Billing Without an SOP	With This SOP
Invoice fields	Cashier decides what to print	Every Rule 46 field on a fixed checklist
GST rate	Whatever was set up years ago	Updated to the post-Sep 2025 GST rates
B2B credit	GSTIN often missed, bill redone	GSTIN captured before billing, every time
E-invoicing	Unsure if it even applies	Clear ₹5 crore rule and IRN/QR steps
Returns	Cash handed back, tax left unreversed	Credit note under Section 34, linked to invoice
Day-end	Rough cash count, no tally	Z-report, tender-wise reconciliation, sign-off
New staff	Trained by the last cashier's habits	Follow a written, rule-cited procedure

Get every bill right the first time

Download the free Retail Store Billing SOP and give your counter a procedure it can follow every day.

FAQ

Frequently asked questions

What must a GST-compliant retail invoice include?

Under Rule 46 of the CGST Rules, a tax invoice must carry your name, address, and GSTIN; a unique consecutive invoice number and date; the HSN or SAC code; a description, quantity, and taxable value for each item; the CGST and SGST (or IGST) shown separately with their rates; the place of supply; a reverse-charge flag; and a signature. The SOP breaks each field down with an example.

Does my retail store need e-invoicing?

E-invoicing is mandatory only for businesses with aggregate turnover above ₹5 crore, effective since 1 August 2023 under Notification 10/2023-Central Tax. It applies to B2B, export, and SEZ supplies, not to B2C counter sales. If your turnover is below ₹5 crore, e-invoicing does not apply, though you still issue normal GST tax invoices.

What is the difference between a tax invoice and a bill of supply?

A regular GST-registered retailer issues a tax invoice showing CGST and SGST. A dealer under the composition scheme (turnover up to ₹1.5 crore, paying a flat 1% for traders) cannot collect GST, so they issue a Bill of Supply with no tax, carrying the declaration "composition taxable person, not eligible to collect tax on supplies" under Rule 49. The SOP covers both.

Can I charge more than MRP or add GST on top of MRP?

No. Under the Legal Metrology (Packaged Commodities) Rules 2011, MRP is the maximum price and you cannot sell above it. MRP is also inclusive of all taxes, so you do not add GST on top of it; the tax is worked back out of the MRP. Charging above MRP or adding GST over it is a Legal Metrology offence.

How do I handle a customer return correctly?

Issue a GST credit note linked to the original invoice number under Section 34 of the CGST Act. This reverses both the sale and the GST charged on it. To reduce your output tax, the credit note must be declared in your returns by 30 November following the end of that financial year, or the annual return date, whichever is earlier. An informal cash return leaves the tax unreversed.

About Petpooja

Petpooja is India's leading SME business software suite, trusted by 1,50,000+ businesses across restaurants, retail, healthcare, manufacturing, and more. From billing and payroll to task management and procurement Petpooja helps Indian businesses run better, every day.

Automate GST-compliant billing for your store

Petpooja Invoice prints every Rule 46 field automatically, generates e-invoice IRN and QR codes, creates e-way bills in one click, and reconciles the day by tender. 8,000+ businesses bill on it.

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