Hello @Sparkle Clean,
At this time, there's isn't an option to automatically deduct your sales tax every time you create your sales transaction.
In the meantime, you can continue transferring the amount to a separate account manually as a way around.
But don't worry, I'll pass along your request to our developers so they'll know of your need for an automatic sales tax deduction.
I've also included this helpful article for future updates of your product: Firm of the Future.
Let me know in the comment section down below if you have any other concerns. I'm always around happy to help.
