I'm trying to work through some tax issues, but I'm unsure of which table holds the actual tax percent for a particular customer, service, item, etc etc.

Thanks,
Joanna

The QuickBooks Sales Tax Code List:

is found in the SaleTaxCode table:

The QuickBooks Tax Item List:

is found in the ItemSalesTax table (including the TaxRate percentage):

Thank you Tom, this was very helpful!!

Now I am curious if Quickbooks can differentiate between a parts tax and a service tax?  It seems to me that tax is determined by customer, and only one tax rate can be applied to any particular invoice.  Is this true?  Or is it possible to differentiate between those items on an invoice that are parts (with one tax rate) and those that are services (with a different tax rate).

Thank you again,
Joanna

All customer records contain both a sales tax code and a sales tax item. When you create a new customer, assuming you opted to make customers taxable, the sale tax code Tax is automatically applied, and the sales tax item you specified in the Most Common Sales Tax Item in the Sales Tax Preferences dialog is also automatically applied.

With over 7,600 sales tax rates in the United States, please consult your nearest QuickBooks Professional on how you should setup Sales Tax.