QB Issue Resolution:

Set up an Other Charge Type item as Two Sided = something you buy and sell. Link the left Expense side to Postage Expense and the right side to Reimbursed Income. Use that item on the Check to pay for that postage, job track it as Billable to them. On their invoice, use the Add Time & Costs button, to select it.

I will attach a screenshot example.

Two_Sided_Noninventory_Item.JPG
Two_Sided_Noninventory_Item.JPG
Items_Accounts.JPG
Items_Accounts.JPG

Resolution for Issue 'How can I add postage charges to an invoice that I want to be reimbursed for but don’t want it to be counted as income?' available: Yes (Solved).
Source: Intuit Community forum.

How can I add postage charges to an invoice that I want to be reimbursed for but don’t want it to be counted as income?: 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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