Legal analysis: the invoice reimbursement period is half a year. The reimbursement of invoices shall be made in the month when invoices are issued or as soon as possible. However, we can't spend the New Year. Tax adjustment is needed for Chinese New Year reimbursement. So in theory, as long as it is the invoice of the year, it can be reimbursed. But under the strict financial system, it is generally required that the earlier the better. Units and individuals that issue invoices shall store and keep invoices in accordance with the provisions of the tax authorities, and shall not damage them without authorization. Invoice stubs and invoice registers that have been issued shall be kept for 5 years. After the expiration of the preservation period, it shall be destroyed after inspection by the tax authorities.

Legal basis: Article 29 of the Measures for the Administration of Invoices in People's Republic of China (PRC). Units and individuals that issue invoices shall keep invoices in accordance with the provisions of the tax authorities and shall not damage them without authorization. Invoice stubs and invoice registers that have been issued shall be kept for 5 years. After the expiration of the preservation period, it shall be destroyed after inspection by the tax authorities.