QB Issue Resolution:

To change it in the Item List section:

  1. Click the Lists menu, then click Item List.
  2. Locate your Sales Tax item that you need to edit.
  3. Right click the Sales Tax item and click Edit Item.
  4. Change the Tax Rate.
  5. Click OK.

Resolution for Issue 'How do I change the sales tax percentage It went down to 6.625% in New Jersey' available: Yes (Solved).
Source: Intuit Community forum.

How do I change the sales tax percentage It went down to 6.625% in New Jersey: 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.

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