Can the software give my customer a proper invoice for their booking that I can also use for my own accounts?

Yes, the software can produce an invoice for every booking, and the same document works for your own accounts. It is built from the booking record itself, so your agency name, your logo, your address, the booking reference, the traveller names, the service details and the amount paid all carry over without your staff typing anything twice. Your staff can download it as a PDF or email it to the customer from the booking screen, and send it again later if the customer loses it.

It helps to know that your invoice is a separate document from whatever the supplier issues. The airline ticket and the hotel voucher are the supplier's papers and carry the supplier's own wording. Your invoice is the one that shows what your customer owes you or has already paid you, including anything you added on top, so it is the document your accountant will actually work from.

Tax is the part that depends on where you operate. We can show your tax registration number, add tax lines and set the wording and layout you ask for, but the rates and the treatment are for you or your accountant to confirm, because the rules differ from one country to another and we cannot decide that for you. If you sell to company clients who want one statement covering many bookings in a period instead of an invoice per booking, that is often possible, though it can depend on your plan, so please ask rather than assume it is included.

The simplest next step is to take the invoice you issue today, mark the fields your accountant insists on, and share it early so the layout can be matched and checked before you start selling.