QB Issue Resolution:

I figured out how to correct it since the transactions spanned two different months. I pay sales tax monthly.

 

I went to the original invoice and made the customer taxable (as they were originally). This made the customer have a $50.40 negative balance. I then made a credit for the sales tax. I dated the credit memo today. That gave me a $50.40 reduction of my sales tax payable for December 2018. This should balance out when I pay December’s sales tax.

Resolution for Issue 'Sales Tax Over Payment' available: Yes (Solved).
Source: Intuit Community forum.

Sales Tax Over Payment: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Over payment
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