How GST is split into CGST and SGST or IGST, and the settings that drive it.
GST is applied on your invoices only when your firm has a GSTIN. Set it under Settings → Firm letterhead (GSTIN, PAN and a 2-digit State code). If the state code is empty, the first two digits of the GSTIN are used. A workspace with no GSTIN gets a flat tax amount with no CGST/SGST/IGST split. You can rename the tax label (GST, VAT or your own) under Settings → Finance.
On the invoice form, 'Place of supply' is a state list. Leave it on 'Not set (derive from billing address)' and Oris Work uses the state in the client's billing address, or pick the state yourself. A badge under it shows the result: 'CGST + SGST: intra-state (State)', 'IGST: inter-state (State)', or a warning 'Place of supply not set: GST split unknown'. Misspelled or missing states in the client's address are the usual cause of the wrong split, so fix the address on the client. If your firm has GST branches (Finance → GST Branches), choosing a 'GST branch' on a new invoice uses that branch's GSTIN and state as the supplier.
A document-level discount reduces the taxable value of every line proportionally, so tax stays correct line by line. The invoice total is rounded to the nearest rupee and the difference is stored as a round-off line, so the books tie to the paisa.
If you leave 'Recipient GSTIN' blank on the invoice, Oris Work uses the Tax number from the client record. Keep it correct there so it prints on the invoice.
Invoicing
Create, send, and track GST-compliant invoices.
Vendor Bills
Record what vendors bill you, track input tax credit and mark bills paid.
E-way Bills
Generate a GST e-way bill from an invoice, add the vehicle number later and cancel if needed.
Adding a Client
Create a client record by hand, and what happens when Oris Work thinks it already exists.