Registered operators will provide a GST invoice if you ask for it but here's the thing, you need to ask before the trip, not after. Many smaller operators skip this unless the customer specifically requests it. If you need it for reimbursement from your company or for tax records, mention it at the time of booking so they prepare it properly with the correct GST number and billing details. Always confirm their GSTIN on the GST portal to make sure it's valid and active. If a company refuses to give a GST bill or makes excuses, that tells you something about how they operate. When finalising any tempo traveller on rent in Delhi, ask for a written quote, advance receipt, and confirmation that a GST invoice will follow after trip completion.