The goods have been declared for export, and the foreign exchange has been delayed for almost half a year. Can I apply for an extension? In addition, foreign exchange cannot be written off. What should I do? You can also apply for an extension of tax collection, but the tax has exceeded the 90-day tax refund period and can only be levied on domestic sales. Write-off, if the amount is not large, you can write off other memo with similar amount first. Really not, you can write a note to SAFE, explain the reasons for not receiving the payment and provide relevant supporting materials for SAFE to handle.