“USPS employees are paid by the United States Postal Service itself, primarily funded through the revenue from stamps, products, and services, not direct taxpayer dollars for day-to-day operations. The USPS is an independent agency, a quasi-governmental entity, that operates like a business, using its own sales to cover salaries, benefits (like health & retirement), and operating costs, while still fulfilling its universal service obligation. ”
I think there’s some tax money that goes to the USPS but it mostly operates as a business, albeit a losing business.