Unit audit will not check invoices under 300 dollars. According to the query related information shows that generally 98% of the invoices will not be checked, unless it is to provide you with the invoice of the company in addition to the problem, and then it will be implicated in you, mainly depending on what invoices, the minimum standard is in the 2000 yuan or so, which is relative to the small and medium-sized enterprises in the third and fourth tier cities.