QB Issue Resolution:
You would date the Payment the date you get the check.
If you consider the customer qualifies for the timely payment discount, I recommend using a Credit Memo. That way, you have control over the data flow, using an Item, and set the date of the credit memo.
The Discount function from the Payments screen doesn’t show on Sales Reports and creates an Out Of Balance condition for reporting purposes. I have attached a screenshot showing this conflict.
Resolution for Issue 'Customer is set up for & Invoice show 3.5% 15 Net 120. I entered pymt (past 15 days), but check was mailed by 15 days, changed received date, still open balance' available: Yes (Solved).
Source: Intuit Community forum.
Customer is set up for & Invoice show 3.5% 15 Net 120. I entered pymt (past 15 days), but check was mailed by 15 days, changed received date, still open balance: 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 apply
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