I'm a retired U.S. citizen living in Thailand. I am living on my social security pension. Do I still have to file/pay taxes?

[hbl3973]

I suggest go into TurboTax Free, enter the Social Security income and see if the tax comes out zero.  If so, no need to file.  For the many details of filing requirements and handling of tax returns for U.S. Citizens living abroad, see IRS publication 54

https://www.irs.gov/pub/irs-pdf/p54.pdf