GST on invoices

How the software applies GST โ€” and where to ask a professional instead.

Why is my invoice showing IGST instead of CGST and SGST?

Because the customer's state differs from the state on your billing profile. When the two differ the full rate is applied as IGST; when they match the rate is split into equal CGST and SGST halves. If the split looks wrong, check the state on the customer record first.

Which GST rates can I choose?

0, 0.25, 3, 5, 18 and 40 percent. The 12 and 28 percent slabs were abolished in September 2025 and are deliberately not selectable, so an old rate cannot be applied to a new invoice by mistake.

Which rate applies to what I sell?

That depends on your goods or services and is a question for your accountant or tax advisor โ€” the software applies the rate you select rather than choosing one for you. The HSN and SAC lookup helps you find the right code, which is usually the starting point for that conversation.

Can I apply TCS or deduct TDS?

Yes, on the plans that include them. TCS is applied on the invoice and TDS is deducted when recording a payment. Both have configurable maximum rates so an out-of-range figure is rejected rather than saved.

Does it produce my GST returns?

It produces the data. GSTR-1 can be exported and GSTR-3B figures summarised from the invoices you raised, so filing works from your billing records rather than a re-keyed copy. The filing itself still happens on the GST portal.

GST and returns

What happens if my customer has no GSTIN?

You can still invoice them. GST is determined by the place of supply regardless of whether the buyer is registered โ€” the GSTIN field is simply left blank on the document.

GST on invoices โ€” Help | WeSaveTax