QB Issue Resolution:

It is income to your business and you recognize the expense as well.  It is called reimburseable expenses.  You can use one account so it nets out to zero or a separate income & expense account.  Talk with your accountant or tax professional to see if they have a preference or recommendation for you.

Resolution for Issue 'I am an event planner and my clients rent items that I do not own but they rent them from me. how do I categorize this income although it is not income for my business.' available: Yes (Solved).
Source: Intuit Community forum.

I am an event planner and my clients rent items that I do not own but they rent them from me. how do I categorize this income although it is not income for my business.: 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 clients rent items
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Error Recovery for clients rent items [Canada]
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