How do I invoice sales tax after the fact?

I would set up an other charge item and called it "Sales Tax Correction" and assign it to an expense account called sales tax adjustment. Make the item Non Taxable. For the amount put in the sales tax amount owed from the customer. Then you need to go into Vendor-Sales Tax- Adjust sales tax and increase the sales tax by the amount of the invoice. Make the adjustment account the same Sales Tax Adjustment. When you adjust the sales tax liability account after issuing the invoice it will zero out the amount in that account. Then you just receive the payment as normal.

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