QB Issue Resolution:

they are not income, though they normally post to a sales income discount account, the posting is a debit which lowers overall income.  It is called a contra account.

ie

sales income 3,000.00  (credit entry in accounting)
>>sales income discount 250.00 (debit entry in accounting)

gross income 2,750.00

Resolution for Issue 'why are discounts you give customers considered income??' available: Yes (Solved).
Source: Intuit Community forum.

why are discounts you give customers considered 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.

Support for considered income
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Error Recovery for considered income [Canada]
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