State tax filing

As far as I can see...Yes..SC would tax it.
BUT perhaps not all of it.  There is a 10k deduction for retirement income, or up-to 25k IF you are 65 or older.
And...SC doesn't tax SS income.

 Check all of the Retirees & Seniors FAQs at:
<a rel="nofollow" target="_blank" href="https://dor.sc.gov/tax/individual-income/faq">https://dor.sc.gov/tax/individual-income/faq</a>
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*