Billing, Cash Handling and Point of Sale Operations
This domain tests the full billing cycle, GST invoice contents, cash discipline and safe acceptance of digital payments.
Documents
A tax invoice for a taxable sale must show supplier name, address and GSTIN; a unique invoice number and date; recipient details where applicable; description of goods with HSN code; quantity; taxable value; rate and amount of CGST and SGST (or IGST for inter-state supply); total value; place of supply; and signature. A bill of supply is used for exempt or composition supplies. A cash memo is the customer's proof of purchase and must match the amount actually collected.
Till discipline
Open the till with a counted opening float. Scan or key in the item, verify the MRP, apply only authorised discounts, confirm the payment mode, print the bill and hand it over with the change. State the amount received aloud before placing it in the drawer. Voids, refunds and price overrides need supervisor authorisation. At day end, expected cash = opening float + cash sales − refunds − cash drops; any variance is recorded and reported, not adjusted silently.
Worked example
Bill total ₹1,247 including 18% GST; customer pays ₹2,000. Change = 2,000 − 1,247 = ₹753, counted back as 500 + 200 + 50 + 2 + 1. Tax check: taxable value = 1,247 ÷ 1.18 = ₹1,056.78; total tax = ₹190.22; CGST at 9% = ₹95.11 and SGST at 9% = ₹95.11. Reasoning: because MRP is tax-inclusive, tax is extracted from the bill, not added on top.
Traps that cost marks
Handing over goods on a customer's payment screenshot instead of confirming on the POS or merchant app; not counting change back; putting cash in the drawer before announcing the amount; and mis-splitting CGST and SGST for an intra-state sale.