For Social Security benefits received in 2017 you should have received a Form SSA-1099 from the Social Security Administration in January.
If you have not received this form then go to this SSA website to request the form - <a rel="nofollow" target="_blank" href="
https://faq.ssa.gov/link/portal/34011/34019/article/3706/how-can-i-get-a-form-ssa-1099-1042s-social-...>
