How can I enter a handwritten paycheck for a prior year in quickbooks online so that the employees pay and tax information will be correct on their 2021 w2?

I'm here to help share how to enter paycheck from the prior year, @tconroy.

You can add the handwritten paycheck as prior payroll information when setting up your payroll account. Let me show you how.

1. Go to Payroll.
2. Select Overview.
3. Click Let's go.

A window will let you enter your employee's information for steps 1 - 7. In step 8, you can enter your previous payroll data. Be sure to include all payroll items and enter the correct amount.

But if you've already created a paycheck for an employee, you'll have to contact our Payroll Care Team so one of our specialists can help you enter your previous payroll data. To do so:

1. Go to Help.
2. Select Search.
3. Click Contact Us.
4. Enter Prior Payroll in the What can we help you with? field.
5. Select Continue.
6. Chose a channel where you want to connect with our dedicated support.

That being said, here's an article you can read to learn more about how you can enter your prior payroll: Set up a prior payroll for QuickBooks Online Payroll.

Additionally, I've also included this reference for a compilation of reports you can pull up to get a better view of your payroll transactions: How to run Payroll Reports in QuickBooks Online?.

If there's anything else that I can help you with aside from entering paycheck from the previous year, please let me know in the comment below. I'll be here to help. Stay safe!