If your income is less than the Standard Deduction (12,550 for Single) you do not have to file a return. You only had $13 of interest? You do not have to file a return. Yes the Standard Deduction applies to all income. Only if you are a dependent then it is calculated differently.
IRS Do I need to file?
Do I Need to File a Tax Return? | Internal Revenue Service
See IRS pub 501 for filing requirements
https://www.irs.gov/pub/irs-pdf/p501.pdf
