Is a printed bill book still legal?
Yes. GST law sets what an invoice must contain, not whether it is handwritten or printed by software. A pre-numbered bill book with your GSTIN printed on it meets the rules if you fill every required field correctly.
The catch is the word 'correctly'. Each handwritten GST bill needs the HSN, the taxable value, the rate and the CGST and SGST amounts worked out on a calculator. Most mistakes on paper bills are maths and missing HSN, not the format. If you are not GST registered, a numbered cash memo without any tax line is what you give.
How do a bill book and a billing app compare day to day?
The difference shows at a busy counter and at month end.
| Paper bill book | Billing app | |
|---|---|---|
| Making a 5-item bill | Write each line, total on a calculator | Search or scan; totals and tax automatic |
| GST maths | By hand, per line | Automatic from the item's rate |
| Copies | Carbon copies that fade and tear | Stored in the account; print or WhatsApp anytime |
| Stock | Separate register, if any | Updated by every bill and purchase |
| Udhaar | Bill marked 'baki', khata updated later | Due goes to the customer's ledger |
| Month-end GST | Add up every bill by rate | Report by HSN and rate in one click |
| Cost | Printing of numbered books | Free plans, or a few hundred rupees a year |
| Without power or internet | Works | Depends on the app; RichBills needs internet |
When does a paper bill book still make sense?
Keep one as a backup even after you switch. If the internet or power fails, write numbered manual bills and enter them in the software later.
A paper book is also reasonable for a very small shop with a handful of bills a day and no GST registration, or for a weekly market stall. In those cases a simple numbered cash memo does the job, and our free invoice generator can print a neat one when needed.
How do I switch from a bill book to an app without stopping sales?
Switch on a quiet day, start with your top items and keep the bill book as a fallback for the first week.
- Pick a start date The first of a month keeps the accounts clean.
- Add your top items 100-200 fast sellers with price, GST rate and HSN, from Excel or by scanning.
- Set up the printer A 58 mm or 80 mm thermal printer, or share bills on WhatsApp only.
- Enter udhaar balances Each credit customer's balance from the khata as on the start date.
- Bill in the app Use the paper book only if the internet fails; enter those bills later.
What must a handwritten GST bill show?
Everything Rule 46 lists, written clearly on each bill. If you stay on paper, have the fixed parts printed on the book so you only fill in the sale.
- Printed: shop name, address, GSTIN and 'Tax Invoice' heading
- Printed: a consecutive bill number unique for the financial year
- Date of the bill
- Buyer's name, address and GSTIN for B2B bills (and place of supply for other states)
- Item description, HSN code, quantity and unit
- Taxable value, GST rate, and CGST + SGST (or IGST) amounts
- Total value and the signature of the seller
Unregistered shops use a plain numbered cash memo with no GSTIN and no tax lines instead.
What do customers notice when a shop moves to an app?
Speed, clear bills and a copy on WhatsApp. A printed thermal bill with every item, the discount and the total is easier to trust than a handwritten slip, and customers who lose the slip can ask for it again.
Customers on credit also see the difference. With a ledger in the app, you can send them their balance on WhatsApp with the bills behind it, instead of reading out a figure from the khata. Disputes over 'I already paid' are settled by the dated payment entry.
For the shop, the change shows at closing: the day's total, cash and UPI split come from the bills themselves, so counting the drawer takes minutes instead of adding up a carbon book.
Do I need a computer to stop using a bill book?
No. Many billing apps, RichBills included, run on an Android phone or tablet as well as a computer, and print to a Bluetooth thermal printer or share the bill on WhatsApp.
A practical starting setup for a small counter is a phone or tablet you already own plus a 58 mm Bluetooth printer. A busy counter with many items per bill is better served by a computer or laptop, a barcode scanner and an 80 mm printer. Start small; you can add devices later without changing software, because the same account works on all of them.