What's the difference between taxes enabled for transactions and taxes enabled for simulation?

You can specify whether a tax is enabled for transactions, simulation, or both. When you're testing, you can enable a tax for simulation to ensure that the setup is correct.

Once you're done testing, you can then enable the tax for actual transaction tax processing.

When you create a simulator transaction, you can select which types of taxes to evaluate for applicability: taxes enabled for simulation only, taxes enabled for transactions only, or both.