I highly appreciate you for joining us here in the thread, Stacey. I'm here to clear some things up and assist you smoothly in handling your checks.

In QuickBooks Online (QBO), voiding a check from a previous year ensures that your records are accurate. To offer you the most precise guidance, I'd like to ask about the original purpose of that check. Was it intended for a vendor bill or a customer refund? Any additional details you can provide would be greatly appreciated.

In situations where you need to void a transaction from a previous period, you have the option to create a journal entry. Here's a quick guide on how:

1. On the upper left corner, select the + New icon.
2. Choose Journal Entry.
3. In the Journal date field, enter the date you want to show the transaction as reversed.
4. Enter the accounts in reverse based on the printed transaction journal.
5. Example: If the transaction you void is a bill payment, debit the bank account, then credit accounts payable.
6. Select Save, then close the window. The transaction is now voided.

For more details about the process, here's an article you can rely on: Void a transaction from another period in QuickBooks Online.

Additionally, I'd highly recommend collaborating with your accountant to ensure the accuracy of your financial records.

Furthermore, I've also included a resource that'll serve as a guide in reconciling your account, which comes in handy moving forward: Reconcile an account in QuickBooks Online.

You can always have me if you have other queries about checks & deposits. It would be my pleasure to lend you a hand again. Let me know if you have any other tasks that you'd like me to help you with.