It is free if you only have SSA1099----but if Social Security was your only income, you are not required to file a tax return unless you have a 1095A for marketplace health insurance. If you have a 1095A, you cannot use the Free Edition---you have to upgrade to a paid version.
Or—-Use this IRS site for other ways to file for free. There are 8 free software versions available from the IRS Free File site
https://apps.irs.gov/app/freeFile/
Or—if you live in certain states you may be eligible to use the new IRS Direct File
In Filing Season 2025, Direct File will be available in Alaska, Arizona, California, Connecticut, Florida, Idaho, Kansas, Maine, Maryland, Massachusetts, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Oregon, Pennsylvania, South Dakota, Tennessee, Texas, Washington, Wisconsin, and Wyoming.
https://home.treasury.gov/news/press-releases/jy2629
That form (SSA-1099) is included in the Free edition of TurboTax. Use the instructions linked here to downgrade back to the Free edition. If that is your only income, you probably do not need to file a return. Do I need to file a return?