Do I have to pay stamp duty if I don't pay the patent investment?

The patent investment has not been paid stamp duty, but it must be returned. According to the "Provisional Regulations on Stamp Duty in People's Republic of China (PRC)", those who fail to pay the stamp duty at the time of patent investment need to pay it in time, otherwise it may be considered as tax evasion, resulting in corresponding fines and penalties. To apply for a patent, you need to pay stamp duty.