South Carolina State Tax Rulings
Free plain-English summaries of state tax letter rulings and advisory opinions issued in South Carolina, with full citations and the original source on every page.
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What South Carolina tax interest rate applies from July 1 through September 30, 2026, and what rate is paid on eligible refunds?
The listed rate for South Carolina tax underpayments and overpayments from July 1 through September 30, 2026 is 7%. Interest is compounded daily, except that simple interest applies to underpayments o…
What South Carolina tax interest rate applies from April 1 through June 30, 2026, and is the same rate paid on eligible refunds?
The listed rate for South Carolina tax underpayments and overpayments from April 1 through June 30, 2026 is 6%. Interest is compounded daily, except that simple interest applies to underpayments of de…
What South Carolina tax interest rate applies from January 1, 2025 through March 31, 2026, and what rate is paid on eligible refunds?
The listed rate for South Carolina tax underpayments and overpayments from January 1, 2025 through March 31, 2026 is 7%. Interest is compounded daily, except that simple interest applies to underpayme…
What South Carolina tax interest rate applies from January 1 through September 30, 2025, and what rate is paid on eligible refunds?
The listed rate for South Carolina tax underpayments and overpayments from January 1 through September 30, 2025 is 7%. Interest is compounded daily, except that simple interest applies to underpayment…
What South Carolina tax interest rate applies for January 1 through March 31, 2025, and what rate is paid on eligible refunds?
The listed South Carolina interest rate for tax underpayments and overpayments drops to 7% for the period January 1 through March 31, 2025 (down from 8% for the prior period ending December 31, 2024).…
What South Carolina tax interest rate applies through December 31, 2024, and what rate is paid on eligible refunds?
The listed South Carolina interest rate for tax underpayments and overpayments is 8% for the period October 1, 2023 through December 31, 2024. Interest is compounded daily, except that simple interest…
What South Carolina tax interest rate applies through September 30, 2024, and what rate is paid on eligible refunds?
The listed South Carolina interest rate for tax underpayments and overpayments is 8% for the period October 1, 2023 through September 30, 2024. Interest is compounded daily, except that simple interes…
What South Carolina tax interest rate applies through June 30, 2024, and what rate is paid on eligible refunds?
The listed South Carolina interest rate for tax underpayments and overpayments is 8% for the period October 1, 2023 through June 30, 2024. Interest is compounded daily, except that simple interest app…
What is South Carolina's tax interest rate for underpayments and overpayments for the period beginning October 1, 2023 (per SC IL #23-17)?
8%. SC Information Letter #23-17 sets South Carolina's interest rate on tax underpayments and overpayments at 8% for the period October 1, 2023 through March 31, 2024. Interest is compounded daily, ex…
What South Carolina tax interest rate applied from October 1 through December 31, 2023, including eligible refund interest?
South Carolina's listed tax interest rate increased from 7% to 8% for October 1 through December 31, 2023. Interest generally compounded daily, except estimated-tax underpayments used simple interest.…
What South Carolina tax interest rate applied through September 30, 2023, including eligible refund interest for fiscal year 2023-2024?
The listed South Carolina tax interest rate remained 7% from January 1 through September 30, 2023. Interest generally compounded daily, except estimated-tax underpayments used simple interest. For fis…
What South Carolina tax interest rate applied from January 1 through June 30, 2023, including eligible refund interest?
The listed rate for South Carolina tax underpayments and overpayments from January 1 through June 30, 2023 was 7%. Interest generally compounded daily, while estimated-tax underpayments used simple in…
What is South Carolina's tax interest rate for underpayments and overpayments for the period beginning January 1, 2023 (per SC IL #22-22)?
7%. SC Information Letter #22-22 sets South Carolina's interest rate on tax underpayments and overpayments at 7% for the period January 1, 2023 through March 31, 2023, up from 6% for the prior period …
What is South Carolina's tax interest rate for underpayments and overpayments for the period beginning October 1, 2022 (per SC IL #22-13)?
6%. SC Information Letter #22-13 sets South Carolina's interest rate on tax underpayments and overpayments at 6% for the period October 1, 2022 through December 31, 2022, up from 5% for the prior peri…
What is South Carolina's tax interest rate for underpayments and overpayments for the period beginning July 1, 2022 (per SC IL #22-9)?
5%. SC Information Letter #22-9 sets South Carolina's interest rate on tax underpayments and overpayments at 5% for the period July 1, 2022 through September 30, 2022, up from 4% for the prior period …
What is South Carolina's tax interest rate for underpayments and overpayments for the period beginning April 1, 2022 (per SC IL #22-3)?
4%. SC Information Letter #22-3 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2022 through June 30, 2022, up from 3% for the prior period (Jul…
What South Carolina tax interest rate applied from January 1 through March 31, 2022?
The listed South Carolina tax interest rate was 3% for January 1 through March 31, 2022. It applied to tax underpayments and overpayments and was compounded daily, except simple interest applied to un…
What South Carolina tax interest rate applied from October 1 through December 31, 2021?
The listed South Carolina tax interest rate was 3% for October 1 through December 31, 2021. It applied to tax underpayments and overpayments and was compounded daily, except simple interest applied to…
What South Carolina tax interest rate applied from July 1 through September 30, 2021?
The listed South Carolina tax interest rate was 3% for July 1 through September 30, 2021. It applied to tax underpayments and overpayments and was compounded daily, except simple interest applied to u…
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending June 30, 2021 (per SC IL #21-5)?
3%. SC Information Letter #21-5 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period July 1, 2020 through June 30, 2021. Interest is compounded daily, except …
What South Carolina tax interest rate applied from July 1 through September 30, 2020, and what did eligible refunds earn?
The listed rate for South Carolina tax underpayments and overpayments from July 1 through September 30, 2020 was 3%. Interest was compounded daily, except simple interest applied to underpayments of d…
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending June 30, 2020 (per SC IL #20-1)?
5%. SC Information Letter #20-1 sets South Carolina's interest rate on tax underpayments and overpayments at 5% for the period July 1, 2019 through June 30, 2020. Interest is compounded daily, except …
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending June 30, 2019 (per SC IL #19-6)?
6%. SC Information Letter #19-6 sets South Carolina's interest rate on tax underpayments and overpayments at 6% for the period January 1, 2019 through June 30, 2019. Interest is compounded daily, exce…
What is South Carolina's tax interest rate for underpayments and overpayments for the period beginning April 1, 2018 (per SC IL #18-11)?
5%. SC Information Letter #18-11 sets South Carolina's interest rate on tax underpayments and overpayments at 5% for the period April 1, 2018 through December 31, 2018. Interest is compounded daily, e…
What is South Carolina's tax interest rate for underpayments and overpayments for the period beginning April 1, 2018 (per SC IL #18-7)?
5%. SC Information Letter #18-7 sets South Carolina's interest rate on tax underpayments and overpayments at 5% for the period April 1, 2018 through September 30, 2018. Interest is compounded daily, e…
What is South Carolina's tax interest rate for underpayments and overpayments for the period beginning April 1, 2018 (per SC IL #18-2)?
5%. SC Information Letter #18-2 sets South Carolina's interest rate on tax underpayments and overpayments at 5% for the period April 1, 2018 through June 30, 2018. Interest is compounded daily, except…
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending September 30, 2017 (per SC IL #17-9)?
4%. SC Information Letter #17-9 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2016 through September 30, 2017. Interest is compounded daily, e…
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending June 30, 2017 (per SC IL #17-5)?
4%. SC Information Letter #17-5 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2016 through June 30, 2017. Interest is compounded daily, except…
What is South Carolina's tax interest rate for underpayments and overpayments for the period April 1, 2016 through December 31, 2016 (per SC IL #16-9)?
4%. SC Information Letter #16-9 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2016 through December 31, 2016. Interest is compounded daily, ex…
What is South Carolina's tax interest rate for underpayments and overpayments for the period April 1, 2016 through September 30, 2016 (per SC IL #16-7)?
4%. SC Information Letter #16-7 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2016 through September 30, 2016. Interest is compounded daily, e…
What is South Carolina's tax interest rate for underpayments and overpayments for the period April 1, 2016 through June 30, 2016 (per SC IL #16-4)?
4%. SC Information Letter #16-4 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2016 through June 30, 2016. Interest is compounded daily, except…
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending March 31, 2016 (per SC IL #16-1)?
3%. SC Information Letter #16-1 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through March 31, 2016. Interest is compounded daily, exc…
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending December 31, 2015 (per SC IL #15-13)?
3%. SC Information Letter #15-13 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through December 31, 2015. Interest is compounded daily,…
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending September 30, 2015 (per SC IL #15-8)?
3%. SC Information Letter #15-8 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through September 30, 2015. Interest is compounded daily,…
What is South Carolina's tax interest rate for underpayments and overpayments for the period ending June 30, 2015 (per SC IL #15-2)?
3%. SC Information Letter #15-2 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through June 30, 2015. Interest is compounded daily, exce…
What is South Carolina's tax interest rate for the period ending March 31, 2015 (per SC IL #14-16)?
3%. SC Information Letter #14-16 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through March 31, 2015. Interest is compounded daily, ex…
What is South Carolina's tax interest rate for the period ending December 31, 2014 (per SC IL #14-13)?
3%. SC Information Letter #14-13 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through December 31, 2014. Interest is compounded daily,…
What is South Carolina's tax interest rate for the period ending September 30, 2014 (per SC IL #14-8)?
3%. SC Information Letter #14-8 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through September 30, 2014. Interest is compounded daily,…
What is South Carolina's tax interest rate for the period ending June 30, 2014 (per SC IL #14-3)?
3%. SC Information Letter #14-3 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through June 30, 2014. Interest is compounded daily, exce…
What is South Carolina's tax interest rate for the period ending March 31, 2014 (per SC IL #13-18)?
3%. SC Information Letter #13-18 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through March 31, 2014. Interest is compounded daily, ex…
What is South Carolina's tax interest rate for the period ending December 31, 2013 (per SC IL #13-14)?
3%. SC Information Letter #13-14 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through December 31, 2013. Interest is compounded daily,…
What is South Carolina's tax interest rate for the period ending September 30, 2013 (per SC IL #13-11)?
3%. SC Information Letter #13-11 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through September 30, 2013. Interest is compounded daily…
What is South Carolina's tax interest rate for the period ending June 30, 2013 (per SC IL #13-5)?
3%. SC Information Letter #13-5 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through June 30, 2013. Interest is compounded daily, exce…
What is South Carolina's tax interest rate for the period ending March 31, 2013 (per SC IL #12-20)?
3%. SC Information Letter #12-20 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through March 31, 2013. Interest is compounded daily, ex…
What is South Carolina's tax interest rate for the period ending December 31, 2012 (per SC IL #12-12)?
3%. SC Information Letter #12-12 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through December 31, 2012. Interest is compounded daily,…
What is South Carolina's tax interest rate for the period ending September 30, 2012 (per SC IL #12-8)?
3%. SC Information Letter #12-8 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through September 30, 2012. Interest is compounded daily,…
What is South Carolina's tax interest rate for the period ending June 30, 2012 (per SC IL #12-3)?
3%. SC Information Letter #12-3 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through June 30, 2012. Interest is compounded daily, exce…
What is South Carolina's tax interest rate for the period ending March 31, 2012 (per SC IL #11-20)?
3%. SC Information Letter #11-20 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through March 31, 2012. Interest is compounded daily, ex…
What is South Carolina's tax interest rate for the period ending December 31, 2011 (per SC IL #11-14)?
3%. SC Information Letter #11-14 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period October 1, 2011 through December 31, 2011 — down from 4% in the prior qu…
What is South Carolina's tax interest rate for the period ending September 30, 2011 (per SC IL #11-10)?
4%. SC Information Letter #11-10 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2011 through September 30, 2011. Interest is compounded daily, …
What is South Carolina's tax interest rate for the period ending June 30, 2011 (per SC IL #11-3)?
4%. SC Information Letter #11-3 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2011 through June 30, 2011. Interest is compounded daily, except…
What is South Carolina's tax interest rate for the period ending March 31, 2011 (per SC IL #10-14)?
3%. SC Information Letter #10-14 sets South Carolina's interest rate on tax underpayments and overpayments at 3% for the period January 1, 2011 through March 31, 2011. Interest is compounded daily, ex…
What is South Carolina's tax interest rate for the period ending December 31, 2010 (per SC IL #10-8)?
4%. SC Information Letter #10-8 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2009 through December 31, 2010. Interest is compounded daily, ex…
What is South Carolina's tax interest rate for the period ending September 30, 2010 (per SC IL #10-5)?
4%. SC Information Letter #10-5 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2009 through September 30, 2010. Interest is compounded daily, e…
What is South Carolina's tax interest rate for the period ending June 30, 2010 (per SC IL #10-2)?
4%. SC Information Letter #10-2 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2009 through June 30, 2010. Interest is compounded daily, except…
What is South Carolina's tax interest rate for the period ending March 31, 2010 (per SC IL #09-22)?
4%. SC Information Letter #09-22 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2009 through March 31, 2010 — extending the same 4% rate the De…
What is South Carolina's tax interest rate for the period ending December 31, 2009 (per SC IL #09-15)?
4%. SC Information Letter #09-15 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2009 through December 31, 2009. Interest is compounded daily, e…
What is South Carolina's tax interest rate for the period ending September 30, 2009 (per SC IL #09-7)?
4%. SC Information Letter #09-7 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2009 through September 30, 2009. Interest is compounded daily, e…
What is South Carolina's tax interest rate for the period ending June 30, 2009 (per SC IL #09-3)?
4%. SC Information Letter #09-3 sets South Carolina's interest rate on tax underpayments and overpayments at 4% for the period April 1, 2009 through June 30, 2009. Interest is compounded daily, except…
What is South Carolina's tax interest rate for the period January 1, 2009 through March 31, 2009 (per SC IL #08-25)?
5%. SC Information Letter #08-25 sets South Carolina's interest rate on tax underpayments and overpayments at 5% for the period January 1, 2009 through March 31, 2009. Interest is compounded daily, ex…
Browse South Carolina rulings by topic
These are official tax letter rulings and advisory opinions issued by South Carolina's revenue authority in response to questions from specific taxpayers about how the tax law applies to their facts. A ruling is binding on the department only for the taxpayer who requested it and cannot be relied on by anyone else, but it is strong evidence of how the state reads the law. Every ruling above has a plain-English question and short answer, plus a link to the full original source.