Deductions & credits

It may actually not be more advantageous to take the standard deduction.  If you are single your standard deduction is $12,550, if married filing joint it is $25,550.  When you are comparing these numbers to the itemized deduction do not just look at what you entered or what is on the summary screen. 

For example, if your summary screen is showing $15,000 in State and Local taxes, only $10,000 counts towards your itemized deductions because of the SALT limitations.

If your AGI is $100,000 and your medical expenses you entered totaled $12,000, only $4,500 would count towards your itemized deductions because you can only claim medical expenses in excess of 7.5% of your AGI.

Also, if you entered employee job expenses for your W-2 income, these are not deductible for your federal return, but they are for some states. 

So when TurboTax is telling you to take the Standard Deduction, it is accounting for the amount you can actually claim, not the amount that you have entered. 

If you want to see your actual Itemized Deductions that you could claim, you can walk through to the end of the deductions and credits section then you will see a comparison.  It will allow you to select Itemized Deductions instead of standard deduction.  Select Itemized Deductions then on the left side of your screen click Tax Tools>>Tools>> View Tax Summary.  You can then see the total of your Itemized Deductions.  

Also, if there is no difference in your refund, TurboTax is defaulting to the Standard Deduction unless you change it.