A Spouse can Never be a dependent. You should have selected that you are filing as Married and that you will be filing the tax return with your spouse when you were entering your personal information in the My Info section of the TurboTax online edition.
To enter Social Security benefits reported on form SSA-1099
Click on Federal Taxes (Personal using Home and Business)
Click on Wages and Income (Personal Income using Home and Business)
Click on I'll choose what I work on (if shown)
Scroll down to Retirement Plans and Social Security
On Social Security (SSA-1099, RRB-1099), click the start or update button
