I'm 70 years old, louisiana native & receive survivors pension benefits(husband died 2019). Do I need 2 file taxes & if so, what form do I use 2 report it?

[Critter-3]

If you only receive SS benefits reported on a 1099-SSA  then you have no reason to file a tax return.    If you receive any other income like a pension reported on a 1099-R form then you may need to file depending on the amount.  

DO I NEED TO FILE A TAX RETURN?

https://www.irs.gov/help/ita/do-i-need-to-file-a-tax-return

Who has to file?

http://www.irs.gov/uac/Do-I-Need-to-File-a-Tax-Return%3F

[NCperson]

to answer your question, you would only file one tax return, listing all your income, including the survivorship benefits.

It is a separate question whether you even need to file - that depends on how much the non-social security income is.