South Carolina business filing due dates

The South Carolina deadlines Ordexly tracks for Oct 2026 to Oct 2027. Every date links to the agency page it was checked against (last checked Oct 14, 2026). Which ones apply to a business depends on its registrations and filing frequency, so confirm with the agency.

Sales & use tax

Due	Deadline	Source
Fri, Nov 20, 2026	South Carolina ST-3 sales and use tax return (monthly filers) October 2026	official source
Mon, Dec 21, 2026	South Carolina ST-3 sales and use tax return (monthly filers) November 2026 Moved from Sun, Dec 20 (weekend).	official source
Wed, Jan 20, 2027	South Carolina ST-3 sales and use tax return (monthly filers) December 2026	official source
Wed, Jan 20, 2027	South Carolina ST-3 sales tax return (annual) 2026	official source
Wed, Jan 20, 2027	South Carolina ST-3 sales tax return (quarterly) Q4 2026	official source
Mon, Feb 22, 2027	South Carolina ST-3 sales and use tax return (monthly filers) January 2027 Moved from Sat, Feb 20 (weekend).	official source
Mon, Mar 22, 2027	South Carolina ST-3 sales and use tax return (monthly filers) February 2027 Moved from Sat, Mar 20 (weekend).	official source
Tue, Apr 20, 2027	South Carolina ST-3 sales and use tax return (monthly filers) March 2027	official source
Tue, Apr 20, 2027	South Carolina ST-3 sales tax return (quarterly) Q1 2027	official source
Thu, May 20, 2027	South Carolina ST-3 sales and use tax return (monthly filers) April 2027	official source
Mon, Jun 21, 2027	South Carolina ST-3 sales and use tax return (monthly filers) May 2027 Moved from Sun, Jun 20 (weekend).	official source
Tue, Jul 20, 2027	South Carolina ST-3 sales and use tax return (monthly filers) June 2027	official source
Tue, Jul 20, 2027	South Carolina ST-3 sales tax return (quarterly) Q2 2027	official source
Fri, Aug 20, 2027	South Carolina ST-3 sales and use tax return (monthly filers) July 2027	official source
Mon, Sep 20, 2027	South Carolina ST-3 sales and use tax return (monthly filers) August 2027	official source
Wed, Oct 20, 2027	South Carolina ST-3 sales and use tax return (monthly filers) September 2027	official source
Wed, Oct 20, 2027	South Carolina ST-3 sales tax return (quarterly) Q3 2027	official source

Payroll & withholding

Due	Deadline	Source
Mon, Nov 2, 2026	South Carolina WH-1605 withholding return Q3 2026	official source
Mon, Feb 1, 2027	South Carolina WH-1606 withholding return 2026 annual reconciliation (Q4)	official source
Fri, Apr 30, 2027	South Carolina WH-1605 withholding return Q1 2027	official source
Mon, Aug 2, 2027	South Carolina WH-1605 withholding return Q2 2027	official source

Unemployment / reemployment

Due	Deadline	Source
Fri, Oct 30, 2026	South Carolina UI UCE-120 Q3 2026	official source
Fri, Jan 29, 2027	South Carolina UI UCE-120 Q4 2026	official source
Fri, Apr 30, 2027	South Carolina UI UCE-120 Q1 2027	official source
Fri, Jul 30, 2027	South Carolina UI UCE-120 Q2 2027	official source

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Nearby: Georgia due dates · North Carolina due dates

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Federal due dates · All states · South Carolina coverage details