GST invoices with numbers that survive a dead network.

01 · Numbering

Numbers that stay consecutive, even with no signal

GST asks for invoice numbers that are unique, consecutive and no longer than sixteen characters. That is easy online and hard offline, which is why a lot of apps quietly renumber bills when they sync — and a renumbered bill is a gap in the series an assessing officer will find. BillCountr gives each user their own letter and counts within it, so the phone can assign A-1, A-2, A-3 with no network at all and the server accepts what the phone decided.

• A per-user series letter, assigned at sign-up
• The device numbers the bill, offline, at the moment you save
• The server never renumbers a bill a device already numbered
• Estimates, pre-orders and credit notes count separately

02 · Tax

The slabs that exist now, not the ones that used to

GST 2.0 withdrew the 12 and 28 percent slabs in September 2025. The rate picker shows what is current — nil, 5, 18 and 40 percent, with 3 percent for gold and jewellery and 0.25 percent for rough diamonds where the trade calls for it. Products you priced under an old slab keep showing the rate they were billed at, labelled as such, rather than being silently re-rated on a bill you already gave someone.

• Nil, 5, 18 and 40 percent
• 3 percent and 0.25 percent for jewellery trades
• CGST and SGST within the state, IGST across it
• Tax can be switched off for shops that do not charge it

03 · HSN

HSN and SAC on the line, not in a note

Each product carries its own HSN or SAC code, four to eight digits, and it prints on the invoice line where it belongs. The picker suggests codes that match your trade — a chemist is offered medicine codes, a hardware shop is not — and you can type one that is not in the list. A code that is not usable is refused when you enter it rather than on the bill you have already handed over.

• Four to eight digit codes, validated on entry
• Suggestions narrowed to your line of trade
• Type your own if the suggestion is wrong
• Prints on the invoice line, per item

04 · Corrections

A finalized bill is never edited

Once a bill is finalized it keeps the settings it was calculated with, even if you change your tax setup afterwards, and nothing can rewrite it. A wrong bill is cancelled and raised again, which marks the original cancelled, reverses its stock and its effect on the customer's balance, and prints with a CANCELLED watermark. A return is a credit note with its own number, which nets out of your sales and tax figures.

• Finalized bills keep their own settings snapshot
• Cancel-and-rebill, with the original left in the record
• Returns become credit notes in a separate series
• Cancelled bills print with a watermark

05 · Reports

Figures you can hand to whoever files for you

Sales, tax, stock valuation and outstanding dues each have a report you can filter by date and export. Reports read the figures stored on the bill at the time it was made rather than recalculating them now, so a report for last quarter does not change because you edited a price this morning.

• Sales with a payment-mode breakdown
• Tax summary over a date range
• Stock valuation on latest purchase cost
• CSV export, or print and save as PDF