If it is deemed as turnover, tax will need to be paid.

Use the POS machine to pay off your credit card by yourself. Is this illegal? If found, one will be held responsible for human or criminal matters. Article 7 of the "Interpretation on Several Issues Concerning the Specific Application of Laws in Criminal Cases Obstructing the Management of Credit Cards" violates national regulations by using point-of-sale terminals (POS machines) and other methods to charge credit card holders with fictitious transactions, false prices, cash returns, etc. If a person directly pays cash, and the circumstances are serious, he shall be convicted and punished for the crime of illegal business in accordance with the provisions of Article 225 of the Criminal Law.

Any person who commits the acts in the preceding paragraph and the amount is more than 1 million yuan, or causes the financial institution's funds of more than 200,000 yuan to be overdue, or causes the financial institution to suffer economic losses of more than 100,000 yuan, shall be deemed to be a criminal offender. "Severe circumstances" as stipulated in Article 225; if the amount is more than 5 million yuan, or if the financial institution's funds are overdue for more than 1 million yuan, or if the financial institution's economic losses are more than 500,000 yuan, it shall be determined. It is “especially serious circumstances” as stipulated in Article 225 of the Criminal Law. If a cardholder maliciously overdrafts in the above manner for the purpose of illegal possession and should be held criminally responsible, he will be convicted and punished for the crime of credit card fraud in accordance with the provisions of Article 196 of the Criminal Law.