I did not work in 2017 I have income from Social Security and a retirement fund. Do I have to file federal income tax?

[flsammet]

Is there an amount that determines eligibility?

[TomK]

Maybe.  Did you have any federal withholding from your retirement fund?  If so, you may want to file in order to get that back.  

Please read this TurboTax FAQ for more information about whether you need to file a tax return: https://ttlc.intuit.com/replies/3302274

Please read this TurboTax FAQ for more information about whether your Social Security is taxable: https://ttlc.intuit.com/replies/3299920