The Entrusted Tax Collection is a service authorized by the tax authority to enterprises to collect taxes on behalf of the tax bureau. Traditionally，the authenticity and compliance of the transaction cannot be guaranteed，which result in missing and fake invoices and even the tax bureau is difficult to ensure the authenticity of transaction and invoice data using tax auditing methods. With the traceability and anti-tampering of blockchain，data from multiple systems can be shared，from data collecting to expense claiming and payment，and all critical procedures and data are all uplink to blockchain. Subsidiaries and the tax bureau are able to trace every single piece of expense，payment and accounting data，which enables the end-to-end and transparently supervised entrusted tax collection. Meanwhile，by establishing data connection to the tax bureau，e-invoice can be issued online and on-chain，and with the fully online management of business，transaction and billing，a closed loop entrusted tax collection system is established，which realizes paperless invoicing and fully transparent supervision.