How do I use a federal tax payment transaction from checking to satisfy a federal tax due for payroll?

Hello there, gary-holmeswy-gm.

Once you record the tax payment on the Payroll Tax page, you can match the downloaded transaction to the payroll payment. To help you with the process, see the below steps:

1. In the left menu, click Banking/Transactions.
2. Locate and select the correct bank account.
3. In the For Review tab, find the tax payment and click it to highlight.
4. Select Find match.
5. Change the From and To dates if necessary.
6. Check the correct tax payment.
7. Click Save.

For more information on this, I recommend the following article: Categorize and match online bank transactions in QuickBooks Online.

After that, you have the option to do your regular bank reconciliation. 

If you have additional assistance while managing your transactions, let me know. I'll be around to provide further assistance. Have a nice day.