The trade method has been determined, and no foreign exchange needs to be written off and tax refunded. Regardless of whether you collect money or not, you can write it off, but you will definitely not be able to get a tax refund. So you only need to write off, which is no different from normal writing off. You can directly use the money to write off; of course, you can also write off the difference directly without collecting foreign exchange (this is the verification of real sample advertising) pin).