How do I void a AP check from last year that was never cashed

Hello there, @moore_23279.

I'd like to provide information about voiding a check from last year in QuickBooks Desktop.

When voiding a check from last year will change the amount of a check to $0.00. VOID is added to the Memo field. Although it's not recommended to void a check from the previous year it's because it may affect your financial record.

However, you can make a deposit with the current date for the total amount and post it to the Other Current Liability account. Once done, create a replacement check to pay out the liability. The deposit should clear against the uncashed transaction to zero out reconciliation. 

Here’s how:

1. Go to the Banking menu and select Make Deposits.
2. Hit OK on the Payments to Deposit window.
3. Choose the account where you want the money deposited to.
4. Enter Date.
5. On the Received From column, select the vendor.
6. Select Other Current Liability under the From Account column.
7. Fill in the Chk No and Amount fields.
8. Hit Save & Close.

Then, reissue the check by following the steps below:

1. Go to the Banking menu and select Write Checks.
2. Enter other necessary information.
3. Under the Expenses tab, select Other Current Liability on the Account column, then the Amount.
4. Hit Save, then Print.

 Also, I'd suggest seeking professional help from your accountant on what's the best way to handle this situation. 

I'm adding these resources that will help you with your task in QuickBooks:

• Record Deposits/make Deposits.
• Create, modify, and print checks.

Please let me know if you have any other questions in mind. I'm always here to lend a hand. Take good care always.

Alternative solution: https://www.youtube.com/watch?v=2_vWmw38ylg