People who can be claimed as a dependent, by someone else, do not always get the full standard deduction. When asked if you could be claimed by someone else, in the personal info section, you probably answered yes.
If you plan to file as Married Filing Jointly (MFJ), with your spouse, answer that question NO. When filing MFJ, you are not considered a dependent. You are a co-filer, even if you have no income, of your own.
