you can't invoice after spending one month.

invoices can be issued within one month after consumption. Invoice refers to the business vouchers issued and collected by all units and individuals in buying and selling goods, providing or receiving services and engaging in other business activities. It is the original basis of accounting and an important basis for law enforcement inspection by audit institutions and tax authorities. The receipt is the proof of receipt and payment, and the invoice can only prove that the business has happened, but can't prove whether the money has been received or paid.

invoice refers to the text issued by the seller to the buyer in economic activities, including the name, quality and agreed price of the products or services provided to the buyer. In addition to the advance payment, the invoice must include the payment from the buyer to the seller according to the agreed conditions, and must include the date and quantity, which is an important proof of accounting. China's accounting system stipulates that valid invoices for purchasing products or services are called tax invoices. The vouchers of government departments' fees and levies have different names in different periods and different fees and levies, but most of them are collectively referred to as administrative fees and receipts. For internal audit and verification, each invoice must have a unique journal number to prevent the invoice from repeating or skipping.

an invoice is the original proof of the cost, expense or income incurred. For the company, the invoice is mainly the basis for the company to make accounts, and it is also the expense certificate for paying taxes; For employees, invoices are mainly used for reimbursement.

Legal basis:

Article 22 of the Measures for the Administration of Invoices of the People's Republic of China shall be issued in accordance with the prescribed time limit, sequence and columns, all of which shall be issued in a lump sum and stamped with special invoices.

No unit or individual may commit the following acts of falsely issuing invoices:

(1) Issuing invoices for others and for themselves that are inconsistent with the actual business conditions;

(2) asking others to issue invoices for themselves that are inconsistent with the actual business conditions;

(3) introducing others to issue invoices that are inconsistent with the actual business situation.

article 2 units and individuals that print, purchase, issue, obtain, keep and cancel invoices within the people's Republic of China (hereinafter referred to as units and individuals that print and use invoices) must abide by these measures.