Your tax liability is not on your W-2. A W-2 is the document the employer issues to you that shows how much you earned and how much was withheld for tax, etc. Your tax liability is based on how much you earned, your filing status, whether you have dependents, whether you are eligible for deductions or credits, etc.etc.etc.---and all of those things are figured out when you prepare your Form 1040---your tax return.
https://turbotax.intuit.com/tax-tips/irs-tax-forms/what-is-a-w-2-form/L6VJbqWl5
A 1040 is the tax return form you prepare here to send to the IRS. If you start entering data in this software you are preparing a Form 1040. Please look at it so you will know what you are sending to the IRS:
PREVIEW 1040
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
Click on Tax Tools on the left side of the screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.
Your tax liability will only be on the Form 1040 after you have entered all of your income, deductions and credits.
The total tax liability will be on the Form 1040 Line 24. Your total tax payments will be on Line 33.
If your total tax liability is greater than your total tax payments you will have taxes owed shown on the Form 1040 Line 37
If your total tax liability is less than your total tax payments you will have a tax refund for the overpayment shown on the Form 1040 Line 35a
You can view your Form 1040 plus Schedules 1, 2 and 3 at any time using the online editions. Click on Tax Tools on the left side of the online program screen. Click on Tools. Click on View Tax Summary. Click on Preview my 1040 on the left side of the screen.