Why is turbo tax putting in 11,913 for my filing single standard deduction instead of 12,400

[Opus 17]

Are you under the age of 24 with a large amount of unearned income (like investments or unemployment compensation)?  That changes your standard deduction.  

[MinhT1]

This happens when you are a dependent of someone else.

Your standard deduction is equal to your earned income plus $350.

Please read this IRS document for more information.

[m-o-1111]

This is it. Thanks for your quick reply.