South Carolina Sales Tax Guide for E-commerce Sellers

Rate structure

South Carolina's state rate is 6%; the combined state + local rate ranges from 6–9%. Sourcing: Destination.

COMPONENTRATENOTES

State rate6%MyDORWAY general statewide rate

Local taxes6–9%State 6% + county local option, capital projects and school district taxes by delivery county.

ReturnST-3ST-3 (Sales & Use Tax Return) + ST-389 (local tax schedule by section)

Economic nexus threshold

You must register and collect once your South Carolina sales reach $100,000, measured over the previous or current calendar year. There is no transaction-count threshold. Sales made through a marketplace facilitator do not count toward the remote seller's threshold — only your direct sales do.

Where you stand: SalesTax50 tests your imported sales against this exact rule and flags South Carolina as Approaching or Exceeded on your Nexus page — check my nexus free →

Filing frequency

MyDORWAY assigns a filing frequency at registration based on expected tax liability and adjusts it over time. Frequencies used in South Carolina: Monthly · Quarterly · Annual.

Due dates

Returns are due on the 20th of the month following the period. When the due date falls on a weekend or holiday it moves to the next business day.

Late filing: 5% per month late filing (max 25%) plus 0.5% per month late payment (max 25%), plus interest.

Marketplace facilitator rules

Since April 2019, marketplace facilitators (Amazon, eBay, Walmart, Etsy, TikTok Shop) collect and remit South Carolina tax on your marketplace sales. How South Carolina treats them:

Who collects?Facilitatoron marketplace orders; you collect on direct Shopify store orders (not TikTok / Facebook & Instagram orders routed through Shopify), WooCommerce, or your own site.

Count toward nexus?Noonly your direct sales are tested against the remote-seller threshold.

Do you still file?YesYes — a registered seller still files, even for periods where all sales were through marketplaces (a zero or marketplace-only return).

How reported?DeductionDeduction if registered.

Direct salesYou collectdirect Shopify store orders, WooCommerce, your own site, invoices — you collect and remit on your return.

Marketplace treatment changes state by state and year by year — SalesTax50 separates marketplace and direct sales automatically, but confirm with South Carolina Dept. of Revenue when in doubt.

Filing portal & AutoFile

South Carolina returns are filed through mydorway.dor.sc.gov. Login verification: May require verification. SalesTax50 AutoFile prepares the ST-3 from your imported sales — you review and approve every return before it is submitted.

FAQ

Do I need a South Carolina permit if I only sell on Amazon?

If you exceed the $100,000 threshold with your direct (non-marketplace) sales or have physical presence (including inventory in South Carolina warehouses), yes — you must register even though Amazon collects for you.

What if I sell on Shopify and TikTok Shop?

TikTok Shop collects as a marketplace facilitator; Shopify does not. You collect on Shopify orders and report both streams on your MyDORWAY return — SalesTax50 separates them automatically.

What about WooCommerce and Etsy?

Same split: Etsy collects as a marketplace facilitator; WooCommerce is your own store, so you collect on WooCommerce orders. Connect both and SalesTax50 keeps the marketplace and direct streams separate on your MyDORWAY return.

Does SalesTax50 file South Carolina returns automatically?

Yes — AutoFile prepares your ST-3 from imported sales; you approve every return before it is submitted, and setting up your existing South Carolina permit is included at no extra charge.

This guide is general information for e-commerce sellers, not tax advice. Rates, thresholds and due dates change — confirm with South Carolina Dept. of Revenue before relying on them.

Let AutoFile handle your South Carolina returns

Prepared and checked for you — you approve before anything is filed.

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