Do you have to file a return all you get is your social security retirement check?

Generally, if Social Security benefits were your only income, the benefits are not taxable and you probably do not need to file a federal income tax return.

If you have any other sources of worldwide income and (tax exempt interest and exempt dividends) then it is possible that some of your SSB to become taxable income on your income tax return and then you would be required to file an income tax return.