Foreign trade cards issued in the current month can be written off in the current month. The verification of foreign trade vouchers needs to meet the following conditions: First, the project needs to be completed, that is, all transactions and businesses of foreign trade projects have been completed. Secondly, you need to go to the tax authorities where the project is located to pay personal income tax. After paying a tax, the corresponding personal income tax shall be calculated and paid according to the proportion of income earned in the current month. Finally, you can cancel the foreign trade card.