These are questions about the software. For what the rules themselves mean, the GST guide explains invoices, the CGST/SGST/IGST split, HSN codes, GSTIN and reverse charge in plain language.
That’s correct, not a bug. After GST 2.0 (22 September 2025) the valid slabs are 0%, 0.25%, 3%, 5%, 18% and 40% — 12% was removed. The item and bill screens only offer these six.
It’s automatic, based on the customer’s state. Same state as your company → CGST + SGST split evenly. Different state → IGST on the whole amount. It reads the state on the party’s own record (or the one you type for a walk-in), so make sure that is correct — an unselected walk-in falls back to your own company’s state.
The screen checks the GSTIN’s own structure and its final check digit — the same test the GST portal uses — so a red "Invalid" almost always means a digit was mistyped. There is no online lookup to confirm a name against a GSTIN; the offline check catches essentially every typo on its own.
That’s what a Composition-scheme registration prints — the law does not allow a composition dealer to charge or show GST on the invoice, so it prints "BILL OF SUPPLY" with no tax column. Turn this on for your company in Settings → Company profile, only if you are actually registered under Composition.
Reports has tabs for the GST liability summary, GSTR-1 (B2B/B2C), GSTR-2 reconciliation against your suppliers’ GSTR-2B, GSTR-3B and the HSN summary. These are built from your saved invoices for you to review, download and file on the GST portal — this software does not file the return for you.
Press Alt + A in Aned Book and ask in your own words. It runs on your own computer with no internet and no account — these pages are that same help, published so it can be found before you install anything.