1). Let you find the invoice for the company expenses. When you pay less corporate income tax (offset income), you also pay less personal income tax (you earn less from your salary). According to you, it is likely that your company evaded your personal income tax.
2). Because it is mainly based on reimbursement, there are many requirements for accounting. "This is not good, this is not allowed. Dozens of tickets will be re-posted, and all typos will be invalid. Although it is a bit strict, it is also to avoid the risk of tax inspection and standardize accounting.
3). Many companies distribute commissions in this way. Is your salary high? Can talk to the company, is there any other way to solve this problem, for employees, it is really troublesome, and there is no explanation, so that employees do not know what the company wants to do.