Why QuickBooks encountered an error while calculating tax. Try reselecting the tax rate or reentering the product/service item and saving the form again.

Hey there, libby.

Can you share with me what exact error message did you get when recording your sales form? In addition, can you tell us what sales transaction are you trying to create in the program? This way, I can provide you with the right troubleshooting steps to help accomplish your task in QuickBooks. 

Any additional info would be much appreciated. Just add them to the thread so I can help you out. Have a good one.