Why do I owe money this year ?

If you added a second W-2, see Why did my refund drop when I entered a second W-2?

Otherwise, if your refund is much lower than last year's refund or you owe, do a line by line comparison of this year's return versus last year's return to identify any differences.  If you are using TurboTax Online, you can see a preview of your 1040 form. 

 Also, double check the amounts you entered into TurboTax to make sure they were entered correctly.

Below are additional reasons why your refund may be lower this year compared to last year: 

• Your 2019 Federal and/or State Tax Withholding was lower than 2018. 
• You didn't defer or you deferred less income into your Employer-Sponsored Retirement Plan or Flexible Savings Plan.
• You didn't qualify for a tax credit you you received last year (or the credit amount decreased).
• You removed a dependent.
• You changed your filing status.
• If you didn't itemize your deductions in 2019 but you itemized your deductions in 2018. 

Related information: Why did my refund go down compared to last year's?