Yes, you can enter $9,000 on the dependent line in QuickBooks, @PDController.

I'd still suggest either using the Tax Withholding Estimator or consulting your accountant to ensure you have the correct calculations. Also, as per IRS guidelines, there are information you'll need when determining whom you claim as a dependent: 

• Marital status, relationship to the dependent, and the amount of support provided.
• Basic income information such as your adjusted gross income.

Once verified, perform the steps outlined in the QuickBooks Desktop Payroll section under Enter a W-4 through this article: What's Changing With The Federal W-4?. 

You can always visit this website: IRS Guide. This link provides you answers to the general, employee, employer FAQs on the 2020 Form W-4. 

I'm always here to help if you need anything else. Take care always, @PDController.