Where do I enter my GSTIN?

Quick answerIn 3 steps

Open Settings → Business & GST → Identity & GST.
Type the GSTIN exactly as on your certificate — it is checked against the state and its check digit — and Save.
Only the owner can change it. The State under Address should match the GSTIN's first two digits.

WhereSettings → Business & GST in the back office

Learn it properlyFill in Business & GST (legal name, trade name, GSTIN, State)Exactly as your GST certificate reads — it prints on every bill.Open the lesson →

Also asked as

“add GST number”
“change GSTIN”