I appreciate you for joining the thread. I'll gladly share a possible reason as to why you can't get around this and enter Sales Tax Prepayments inside your QuickBooks Online (QBO).

You can't enter the prepayment in QBO because the program uses the schedule you entered in your sales tax setting. A workaround for this is to add an adjustment. I can input the steps below to get you started. Here's how:

1. Access your QuickBooks Online company.
2. On the left navigational bar, go to the Taxes tab.
3. Locate your accumulated taxes.
4. In the Action column, click View Tax Return.
5. Below Total tax section, click the +Add an adjustment hyperlink.
6. In the Reason, you'll want to select Prior prepayments.
7. Enter the Adjustment date, and then choose the appropriate account.
8. Enter the prior prepayments amount in the Amount section.
9. Once done, click Add button below.

I'd also recommend reaching out to your accountant if you're unsure of the steps that I've mentioned. This way, they can provide you other ways to enter your prepayments.

Feel free to visit this article for more information about the process: Create or delete a sales tax adjustment in QuickBooks Online.

Additionally, see this page to learn more about adding details to your reports in QBO: Customize reports in QuickBooks Online.

Thanks for dropping by today. In case you have any additional QuickBooks-related concerns, feel free to post here again. Take care, and have a nice day!