GST invoices with numbers that survive a dead network.
Consecutive invoice numbers, an HSN code on every item, the slabs that are current, and mistakes put right by cancelling and re-billing — never by editing a bill you already gave someone.
Invoice numbers
Consecutive, offline or online
Slabs
0, 5, 18 and 40 percent
Line detail
HSN or SAC per item
Returns
Credit note, on Pro
What you need to know
What GST asks for, and how this answers it.
5 topics
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, because a number handed out by a server cannot be handed out with no connection, and a bill renumbered when it syncs leaves 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 and pre-orders count in their own series
02 · Tax
The slabs that exist now, not the ones that used to
The 12 and 28 percent slabs are gone: most goods moved off them when GST 2.0 took effect on 22 September 2025, and tobacco and pan masala followed on 1 February 2026. 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, or IGST — one setting for the shop
Tax can be switched off for shops that do not charge it
03 · HSN
HSN and SAC on every item, not in a note
Each product carries its own HSN or SAC code, four to eight digits. 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. On bills from the Android app, switch on the HSN field in your bill settings and the code prints on every line; bills made on a computer do not print it yet.
Four to eight digit codes, validated on entry
Suggestions narrowed to your line of trade
Type your own if the suggestion is wrong
Printed on each line of the phone's bills, once switched on
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 mark. On Pro, 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 seriesPro
Cancelled bills print with a watermark
05 · Reports
Figures you can hand to whoever files for you
Every plan has the sales summary and the dues report. Pro adds the full set, from the tax summary and stock valuation to purchases and item sales, with export to Excel or a branded PDF. 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.
Yes, including the invoice number. The device holds its own counter and assigns the next number in your series the moment you save, so a shop with no signal all day still produces consecutive invoices. The server stores the number the device chose and does not change it.
What happens if two devices bill at the same time offline?
Each user has their own series letter, so two people billing at once (from Pro) produce A-14 and B-9, not two A-14s. In the rare case a genuine collision is detected on sync, it is flagged for the owner to review rather than being silently overwritten or dropped.
Which GST rates can I charge?
Nil, 5, 18 and 40 percent, plus 3 percent and 0.25 percent for jewellery and rough diamonds. The 12 and 28 percent slabs are no longer offered (most goods left them on 22 September 2025, and tobacco and pan masala on 1 February 2026), though older products still display the rate they were originally billed at.
Does it file my GST returns?
No. BillCountr produces the invoices, and on Pro the tax summary, which exports to Excel or PDF for whoever files on your behalf. Filing itself is not part of the product.
Can I bill a GST-registered business?
You can make the bill, but the buyer's GSTIN and address do not print on the invoice yet, and a registered buyer needs both on it to claim input tax credit. Until that is built, BillCountr's GST invoices suit sales to consumers; a shop that mostly bills registered businesses should know this before it starts.
Yes. Tax is off by default for trades that usually do not charge it, and bills print as plain invoices or estimates with no tax lines at all. You can turn it on later without touching bills you have already made.
