Are there any problems with the valves, pumps and fittings of self-employed households?

Operate valves, pumps and pipe fittings. These mainly depend on which customers you are targeting. Usually there are more big customers. Or just retail? A few days ago, I used my ID card to ask the tax bureau to open it on my behalf, and I only charged 3%. If I am a self-employed, it is 6-7%. If you need an invoice, you can provide it.