Hello @JKCEnt,

Your Sales Tax Liability report on a Cash basis will always show your sales transaction recorded on the same report period you've run. You can read this article to understand more about your report: Review sales tax reports.

You're right, creating an adjustment will fix the amount you owe indicated on the Pay Sales Tax window. Here's an article you can read to learn more about sales tax adjustment: Process sales tax adjustment.

You can also read this helpful article in case you need some related articles in managing your sales taxes: Sales Tax in QuickBooks Desktop.

Let me know in the comments below if you have any other questions. Always around ready to help.