Make sure you have entered the W-2 as it was issued to you. Because tips are income, they need to be reported on your tax return. Normally, you would report your tips to your employer, who then includes them on your W-2. Whether included on your W-2 or not, enter your tips in TurboTax with the employer's W-2. If you have allocated tips in Box 8, you may have unreported tips.
[Edited 03/15/20]
