1 according to your above situation, the first thing to look at is what project you are engaged in. If your project needs to pay business tax, then you can't ignore it. Business tax is calculated as a percentage of income, but I don't think you need to pay it. You can see the tax law about what business tax needs to be paid.

If you don't need to pay business tax as above, then you need to pay value-added tax, and I think your situation is also a problem of value-added tax. Then it is divided into two situations. If you are an ordinary taxpayer, you basically don't have to pay it, because your cost input can be deducted from your sales, and the tax rate is 17%. But in many cases, you are a small-scale taxpayer, so your tax rate is 4% or 6%, so you can't.

According to the above situation, you still lose money. If you don't invoice, you don't need to pay it. It's a little cheating.