The tax is on revenue, so the thinner your margins, the more extreme the tax. Another reply here says that a 7% revenue tax is a 50% tax on a 14% margin transac

The tax is on revenue, so the thinner your margins, the more extreme the tax. Another reply here says that a 7% revenue tax is a 50% tax on a 14% margin transaction, but it's even worse than that, since the tax is on the whole revenue, including your margins.