But, but, business doesn't pay taxes, their customers pay taxes.
You are correct. The customer pays all these taxes and compliance costs. Corporate taxes, employee withholding, employer FICA, employee FICA -- they're all in the price of the product.
Incident on the worker? Well, the employee gross wages are in the price of the product. gross = net + withholding. If the withholding isn't enough or too much, the employee adjusts it on April 15th.
But the customer still pays because the employee GROSS wage is in the price of the product, not just his taxes.