Understanding GST in E-BillR

E-BillR applies Indian GST rules automatically so your invoices are tax-correct. Here's what happens behind the scenes.

CGST + SGST vs IGST

GST routing is based on the explicitly selected states of your company and the client — not guessed from a GSTIN prefix or address text.

Both your Business Profile (in Settings) and each customer have a dedicated State (place of supply) dropdown. E-BillR compares those two values on every invoice and applies one of three outcomes:

• Same state (intra-state) — the tax is split into CGST and SGST, each half the GST rate. An 18% slab becomes 9% CGST + 9% SGST.
• Different state (inter-state) — the full rate is charged as a single IGST line. An 18% slab becomes 18% IGST.
• Outside India (Export) — the invoice is zero-rated: no CGST, SGST, or IGST is added.

You never choose CGST/SGST/IGST manually — the engine routes it from the two selected states.

How states are set

• Your company state — select it in the State (place of supply) dropdown in Settings. Entering your GSTIN auto-fills the matching state (the first two digits of a GSTIN are its GST state code), but the dropdown is always editable.
• Client state — set in the customer record, or in the Bill to section when creating an invoice. It pre-fills from a saved customer or from the client's GSTIN, and can always be overridden.

Exports are zero-rated

Selecting Outside India (Export) as the client's state zero-rates the invoice (a zero-rated supply, as permitted for exports of services). No CGST, SGST, or IGST is added.

Why totals are always exact

E-BillR stores every money amount in paise (1/100 of a rupee) as whole integers — never as decimals. This avoids the rounding errors that creep in when money is held as floating-point numbers, so your subtotal, tax, and total always add up to the paisa.