Excuse me, how long is the validity period of the purchased office supplies, and how long will it be invalid?

Tax: if invoices are obtained within the settlement period (i.e. before May 3 1 of the following year), pre-tax deduction is allowed, but it is not allowed after the deadline.

Accountant: It won't be a month, let alone a year. But in actual work, the amount is not large, and no one delves into it across the month; On New Year's Eve, it is required to adjust the profit and loss of last year.