I found some back-dated entries affecting sales tax, which were not included in any tax filings. How do I get these amounts included in the next filing?

Back-dated bills are linked to a closed filing period, so QuickBooks Online (QBO) won't automatically transfer the $4,000 ITC debit to the next return. You can manually add the adjustment to the current open return using the sales tax adjustment feature in the Tax Centre.

Here's how to do it:

1. Go to Taxes.
2. Select Sales Tax.
3. Click on Prepare return for the current open period.
4. Add an adjustment and enter the ITC amount.
5. Select the appropriate tax line (ITC's or Input Tax Credits), then Save.

After completing these steps, the adjustment will then be included when you file the current period's return.

For more information about this process, please check out this article: Create or delete a sales tax adjustment in QuickBooks Online.

Please feel free to leave a comment below if you have any other questions about back-dated sales tax entries.