How often do I file sales tax returns in South Carolina?

South Carolina assigns filing frequency based on your expected tax liability: monthly for high-volume sellers, quarterly for mid-volume, annually for low-volume. The DOR may reassign as your activity changes.

What if I had zero sales in South Carolina for a period?

You still file a zero return. Missing filings trigger penalties regardless of tax owed. Most tax services file zero returns automatically.

When are South Carolina sales tax returns due?

Typically the 20th of the month following the filing period (with variations). Late filing and late payment each carry their own penalty structure — file early to avoid either.

South Carolina Sales Tax Filing Guide — 2026

Updated 2026-06-08

If your Filing business sells $100,000 into South Carolina in a calendar year, you have economic nexus and must register, collect, and remit South Carolina sales tax.

Filing frequency in South Carolina

Most states assign a filing cadence when you register, based on your expected tax liability: monthly for high-volume sellers ($50K+ tax liability/year), quarterly for mid-volume, and annually for low-volume. South Carolina may reassign your frequency if your liability changes materially.

Zero returns still matter

Even if you had zero taxable sales in South Carolina during a period, you must file a zero return. Missing filings trigger penalties regardless of tax owed. Most automated tax services will file zero returns for you by default.

Due dates

South Carolina's filing due dates are typically the 20th of the month following the period end (with variations). Late filing penalties are usually 5%/month up to 25%; late payment adds interest. Register for the state's auto-pay or use a service that remits on your behalf to avoid late fees.

Filing mistakes that cost South Carolina sellers

Skipping a zero return in a slow month — most penalty exposure comes from missed filings, not unpaid tax.
Waiting until due date to file; South Carolina's portal can time out on volume days. File at least 48 hours early.
Not keeping exemption certificates on file — if you're audited and can't produce a valid certificate for a tax-exempt sale, that sale becomes taxable and you owe the uncollected tax.

South Carolina nexus note

South Carolina sales tax nexus and economic nexus threshold: a remote seller has economic nexus when gross revenue exceeds $100,000 in the previous or current calendar year from sales of tangible personal property, products transferred electronically, or services delivered into South Carolina. South Carolina uses a sales-only threshold -- no transaction-count test. Remote sellers with economic nexus must obtain a Retail License and remit South Carolina Sales and Use Tax beginning the first day of the second calendar month after economic nexus is established; licensed remote sellers collect applicable state and local taxes on taxable South Carolina sales. SCDOR marketplace guidance treats marketplace facilitators as retailers responsible for state and local sales/use tax on products sold via the marketplace, and remote marketplace facilitators use the same $100,000 economic nexus standard, counting tangible personal property, products transferred electronically, and services delivered into South Carolina. South Carolina DOR source data last retrieved 2026-06-08.

What to do next

Read the full South Carolina overview for thresholds, filing frequency, marketplace facilitator rules, and registration links. Use the nexus calculator to check whether you have crossed the threshold. For background on the post-Wayfair economic nexus framework, see the pillar guide.

Frequently asked questions

How often do I file sales tax returns in South Carolina?: South Carolina assigns filing frequency based on your expected tax liability: monthly for high-volume sellers, quarterly for mid-volume, annually for low-volume. The DOR may reassign as your activity changes.
What if I had zero sales in South Carolina for a period?: You still file a zero return. Missing filings trigger penalties regardless of tax owed. Most tax services file zero returns automatically.
When are South Carolina sales tax returns due?: Typically the 20th of the month following the filing period (with variations). Late filing and late payment each carry their own penalty structure — file early to avoid either.

Sources

date_retrieved: 2026-06-08