Welcome to the Community, @jasonnyc258. I've come to help you record the discount in QuickBooks Online (QBO).
In QBO, you can simply edit the invoice transaction to add the discount before receiving the payment. Before doing so, ensure that the discount settings is enabled. Once done, follow these steps:
If you want to show the discount on a different date, you can record it as a separate transaction. For more details on applying a discount in QBO, feel free to visit this article: Add a discount to an invoice or sales receipt in QuickBooks Online.
Getting a list of your customers’ outstanding balances will help you determine how much still due and how long they’re past due are. To have this data, simply run the accounts receivable aging report.
Leave a comment below if you have any other questions about recording discounts in QBO. I'm just around the corner to help. Keep safe always.
Is there still $10 due on the bill? If not, where did the $10 go?
Is your client on accrual or cash basis? If they are cash basis, you can adjust the original invoice to include the discount to bring the bill down to $90 because the expense was not booked in 2021, it was booked when paid in 2022. If they are on accrual and they haven't closed out 2021, you can do the same. If they have closed out 2021, then there should still be $10 due on the bill which can be cleared with a credit memo dated 2022 and assigned to the same expense account as the original invoice. Apply the credit memo to cover the $10 outstanding on the bill.
Its on accrual basis, and 2021 has been closed out. So i need to record this as income somehow since
i recorded the full $100 amount as an expense, but now only really 90$ when it was paid. there will be no credit going forward to customer. it shows at $10 outstanding to client
Create a bill credit (Enter Bills>Credit) for $10 and assign it to the same expense account as the original invoice. Then, pay the bill by applying the credit. This will create a journal entry that debits (reduces) A/P and credits (reduces) the expense. The vendor balance due will be $0 and you should be all set. Assigning it to income is not really accurate as the discount was an expense reduction, not income. Both are credit entries so the result is the same.