Yes, if TurboTax shows that you owe more after you enter an IRA contribution, that means the program is showing an excess contribution.
Since $600 is no where near an excess contribution by itself, I wonder if you have entered any other IRA contributions for the year.
You are allowed to contribute up to $6500 total per year to all forms of IRAs ($7500 if you are over 50 years old).
That means if you contribute $6500 to your Roth IRA and $600 to a traditional IRA, you have an excess contribution of $600.
If you are making contributions to retirement plans through work, you only enter that information on the W-2 screen.
To see if you have actually overcontributed, or just entered your information wrong, review the IRA contribution section:
If you have overcontributed to your IRA accounts, you can contact your IRA administrator and take a corrective action, such as removing the excess contribution plus earnings from your IRA.
As long as you make any needed corrections by April 15, there is no penalty.
No, I have only contributed $600 total this year. I have no Roth. It’s a 401k Traditional IRA. I did not come close to the $6500 on contributions. I have already entered my 1099-DIV under Interest and Dividends.
Please be aware that you do not enter the 401k contributions in the IRA contribution section. Retirement plans at work, like the 401k, is not an IRA and therefore won't be entered in the IRA contribution section under Deductions and Credit. You only enter traditional IRA and Roth IRA in this section.
To delete the entry: