I am having difficulty getting the tax to print out on invoices. The tax is always charged correctly, and the total invoice amount is always correct, but the tax line on the invoice is occasionally zero instead of the correct tax amount.

Example:

Sub total: 25.00
Tax: 0.00
Total: 26.84

Now this doesn't always occur. What's frustrating is that I can run the same order for the same product to the same customer and get different results on the printout.

The specification code I am using is "V5, tax value" I have tried virtually all other codes with no luck. Any help is appreciated.