South Carolina Sales Tax: What a Small Business Actually Has to Do

Income tax has a natural rhythm — you file once a year, you know when it is coming, and if the business made nothing you owe nothing. Sales tax has none of that. It attaches to the transaction, not the profit, it is money you collected on the state's behalf rather than money you earned, and the state takes a considerably dimmer view of it being late.

Everything below is current as of August 2026. Local rates in particular change by county referendum, so the rate you need is the rate for the delivery address, not a figure you remember for the county.

The rate is not one number

The statewide sales and use tax rate is 6%. On top of that, counties may impose an additional local sales tax where voters have approved it. The result is that two customers in the same metropolitan area can be owed different amounts of tax, and the deciding factor is where the sale is sourced rather than where your office is.

The SCDOR publishes a rate lookup for exactly this reason. Use it per address. A business shipping across the Lowcountry that applies one rate to everything is either overcollecting from some customers or underpaying on others, and only one of those gets noticed by the customer.

The Retail License

Anyone engaged in retail sales in South Carolina must obtain a Retail License, and you need a separate one for each retail outlet. Apply through the MyDORWAY Business Tax Application. There is a fee; check the current amount when you apply rather than relying on a figure quoted somewhere.

Two points that catch new businesses:

• Online-only counts. If you sell tangible personal property at retail into South Carolina, having no storefront changes nothing. You need the license and you remit tax on orders shipped to a South Carolina address.
• The license comes before the first sale, not after the first busy quarter. It is not a threshold-based registration for an in-state seller.

Filing and paying

Sales and use tax is reported on the State Sales & Use Tax Return, Form ST-3, with the Schedule for Local Taxes, Form ST-389, attached. Monthly filing is the default; quarterly and annual filing are available on request where volume supports it. If your South Carolina liability is $15,000 or more per filing period, you are required to file and pay electronically.

A return is due whether or not you made a sale. A month with no taxable sales is a zero return, not a month off, and the penalty for not filing runs whether or not tax was due.

If you operate from more than one location, MyDORWAY supports consolidated returns so you file once rather than per outlet.

Selling into South Carolina from outside it

The SCDOR can require an out-of-state retailer to obtain a Retail License and collect and remit South Carolina sales and use tax once the retailer exceeds $100,000 in gross revenue in South Carolina in a calendar year. That is economic nexus, and it does not require an office, an employee or a warehouse in the state.

The number to watch is gross revenue, not taxable revenue and not profit. A seller whose South Carolina orders are mostly exempt can still cross the threshold, and the obligation to register arrives with the threshold rather than with the tax.

The mirror image applies to South Carolina businesses selling elsewhere. Every state sets its own threshold, and a business that grew online without noticing is often registered in one state and unregistered in six.

Lodging is its own regime

South Carolina imposes a 7% sales tax on charges for rooms, lodgings or sleeping accommodations furnished for less than 90 days to the same person. Additional guest charges added to the room charge — room service, laundry and dry cleaning, in-room movies, telephone, meeting room rentals — are taxed at 6%.

Then there are local accommodations taxes, imposed by many counties and municipalities and not administered by the SCDOR. You report those to the jurisdiction, not to the state, and the jurisdiction is determined by where the property sits rather than by its mailing address. Around Summerville in particular, the mailing address does not tell you which county or municipality you are in.

Platforms collect some of these charges and not all of them. Assuming the platform has handled everything is the single most common short-term rental error we see, and the shortfall accumulates quietly.

The part that is not really about tax

Sales tax you collect is not revenue. It arrives in the same bank account as revenue, which is why it gets spent, and why a business with healthy sales can be unable to make a filing. The fix is bookkeeping rather than tax planning: reconcile the liability monthly so the figure on the return is a number you already knew, and keep the collected tax somewhere you are not going to reach for it.

None of this is advice about your situation. Whether a particular sale, service or transaction is taxable in South Carolina turns on specifics, and the exemptions and exclusions are extensive. If you are not sure whether what you sell is taxable, that is the conversation to have before the first return rather than after the third.