How do you know how much you owe in taxes?

HOW MUCH IS MY REFUND?  DO I OWE?

No one else can see your screen, your tax return or your account. But YOU can see it.

What does it say on the "refund monitor" on the screen?

Look at your Form 1040.  What do you see on line 20?  Line 23?

 Line 20 is a refund

Line 23 is tax due that you have to pay to the IRS

PREVIEW 1040

https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing

What does the TurboTax summary show you?  What does it say in Tax Home?

What are your fees?  Are you having them deducted from your federal refund?  If so, then do some math.

How can I see my TurboTax  fees?  

https://ttlc.intuit.com/questions/2565973-how-do-i-review-my-fees-in-turbotax-online

If you have federal tax due you can pay by mailing your payment with the 1040V voucher, having the payment taken out of a designated bank account, or you can pay directly on the IRS website.

https://www.irs.gov/payments/direct-pay

You must pay your state tax due using the state’s preferred method of receiving payment.  For most states that will be by making a payment to the state’s own tax website, or by mailing a check or money order.

https://ttlc.intuit.com/questions/1900884-what-are-my-options-for-getting-my-state-refund-or-for-paying-any-state-taxes-i-owe