Dear, I'm glad to answer your question: The latest tax return date of ukey is the last day of last month. The answer is normal. Before the tax return period, that is, this month, before the 30th, Ukey is the golden tax plate, which is a system evolved by the tax department for the convenience of tax return. It belongs to the installation disk of the golden tax system and is used to install the golden tax control system on the computer. The two kinds of tax control equipment, the golden tax plate and the tax control plate, are provided by two different technical service units respectively. The functions of the two systems are the same, that is, the new VAT invoice management system realizes that general VAT taxpayers use tax control equipment (golden tax plate or tax control plate) to encrypt and issue special VAT invoices, ordinary VAT invoices and unified motor vehicle sales invoices. Small-scale taxpayers use tax control equipment (golden tax plate or tax control plate) to encrypt and issue ordinary VAT invoices and unified motor vehicle sales invoices. Both the golden tax plate and the tax control plate are filled with the taxpayer's tax digital certificate, which realizes the security functions of taxpayer identity authentication, invoice digital signature and encryption uploading. The invoice data issued has been authenticated by the tax digital certificate system and uploaded to the tax authorities in real time through the Internet. The Golden Tax Project is a high-tech management system designed by absorbing international advanced experience and combining high-tech means with the actual value-added tax management in China. The system consists of a network and four subsystems. A network refers to the four-level computer network between State Taxation Administration of The People's Republic of China and provincial, prefectural and county state taxation bureaus; The four subsystems refer to the VAT anti-counterfeiting fiscal invoicing subsystem, the anti-counterfeiting fiscal authentication subsystem, the VAT audit subsystem and the invoice investigation subsystem.