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…
Did South Carolina extend tax filing and payment deadlines because of Hurricane Idalia, and which taxes qualified?
Yes — South Carolina matched the IRS's Hurricane Idalia relief and postponed certain filing and payment deadlines to February 15, 2024. After FEMA designated all of South Carolina a disaster area and …
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 …
Because of the Emancipation Day holiday, what was South Carolina's 2021 income-tax filing and payment deadline, and by when did a 2018 refund claim have to be filed?
April 18, 2022. Because Emancipation Day (April 16) was observed Friday, April 15, 2022 in Washington, D.C., the federal deadline moved to Monday, April 18, 2022, and South Carolina — whose due date s…
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 filing and payment relief applied to people and businesses affected by the April 2020 tornadoes, storms, and flooding?
South Carolina matched the IRS and postponed covered state-equivalent filing and payment deadlines to October 15, 2020 for affected taxpayers in Aiken, Barnwell, Berkeley, Colleton, Hampton, Marlboro,…
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…
Which South Carolina COVID-19 tax deadlines were moved to July 15, 2020, and which other state taxes remained due June 1?
South Carolina moved covered income-tax, franchise-tax, and corporate-license-fee filings and payments originally due from April 1 through July 15, 2020 to July 15. The same date applied to estimated …
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 …
Did South Carolina waive the estimated-tax underpayment penalty for farmers and fishermen for tax year 2018 (per SC IL #19-8)?
Yes. Following IRS Notice 2019-17, South Carolina will waive the estimated-tax underpayment penalty for qualifying farmers and fishermen for tax year 2018 if they file their income tax return and pay …
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 South Carolina tax filing and payment relief is available to taxpayers affected by Hurricane Matthew (per SC IL #16-12)?
SC Information Letter #16-12 grants South Carolina tax filing and payment relief to individuals and businesses affected by Hurricane Matthew. Deadlines for returns and payments due on or after October…
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 South Carolina tax filing and payment relief is available to taxpayers affected by the October 2015 South Carolina floods (per SC IL #15-14)?
SC Information Letter #15-14 grants South Carolina tax filing and payment relief to individuals and businesses affected by the October 2015 South Carolina floods, matching the IRS relief (IR-2015-112)…
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…
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.