Cash sales and tax reconciling

[EcoPawz]

We sell our products mostly in even $10 amounts.  When we process credit cards, tax is not a big deal but when we do cash transactions, it slows up the transaction having to charge the $10 + tax.  Rifling around for change etc etc.  Is there a way that I can set up a discount that will equal the sales tax exactly?  I still want to record the sales tax and do everything legit, but also want to let someone throw me a $10 or $20 or, let's dream big, a $100 dollar bill and be on their way quickly.  Thoughts?

[Minion]

I use invoices mainly and give customers  a discount when they pay with cash/check of 3%. So you should be able to set up a discount the same way just in the amount for your sales tax and the "should" work.