Excuse me, is the deposit slip issued by the hotel an invoice?

No, the deposit slip is only proof of your stay in the hotel. You should return the deposit to the hotel when you leave. Generally speaking, when you check in, you can issue a deposit slip, and then when you check out, you can recover the deposit slip and invoice you according to your actual consumption amount. The deposit will be refunded more and replenished less.

Invoice refers to the business vouchers issued and collected by all units and individuals in buying and selling goods, providing or receiving services and engaging in other business activities. It is the original basis of accounting, and it is also an important basis for law enforcement inspection by audit institutions and tax authorities.