A South Carolina sales tax audit is handled by the South Carolina Department of Revenue (SCDOR). If you receive an audit notice, respond promptly, read the notice for the periods and records requested, preserve relevant documents, and contact the auditor using the details in the notice. Do not ignore the request or assume that an informal conversation changes a formal deadline.
South Carolina combines state sales tax with local taxes that can vary by county and, in some cases, municipality. It is not a home-rule state in which local jurisdictions administer their own sales tax systems; SCDOR administers the state and local sales taxes. The state also caps tax on certain large purchases, including vehicles, so the correct treatment can depend on the item and transaction. Sales Tax Compliance USA is a people-staffed, done-for-you service that can help ecommerce and cross-border sellers organize records, assess audit findings, and prepare a response.
What to do after receiving a South Carolina audit notice
Start by identifying the notice type, the auditor’s contact information, the tax types and periods under review, and the response date or document-production instructions. SCDOR says an audit begins with an Audit Request (I-366). Keep the notice and envelope or electronic delivery details, and make a calendar of every stated deadline. If the notice is unclear, ask the auditor to clarify the scope and how records should be submitted.
Preserve relevant accounting, order, payment, shipping, exemption, and tax-return records in their original form. Avoid deleting or altering records, and do not send a rushed, unreviewed data dump. Reconcile the records you plan to provide to filed returns and explain any gaps or unusual accounting entries. If you need more time, request it from the auditor in writing before the due date; do not assume an extension has been granted until confirmed.
Understand the audit scope and gather requested records
Read the request line by line and build a checklist organized by tax period and record type. SCDOR may examine books and records to determine whether taxes were reported correctly. Relevant materials can include sales and purchase invoices, general-ledger detail, sales journals, filed returns, bank and payment-processor statements, marketplace and ecommerce order data, shipping and delivery records, exemption or resale documentation, and records supporting refunds, credits, and tax collected.
South Carolina requires taxpayers subject to sales and use tax to keep records, receipts, invoices, and other pertinent papers in the form required by the Department, including electronic records. Purchase invoices must identify vendors by name and address, and wholesale and retail sales should be separately recorded; if they are not, the Department’s policy manual describes a presumption that sales are retail. Provide records that answer the request, retain a copy of everything submitted, and keep a log of what was sent and when.
Key deadlines and how far back SCDOR can review
Use the dates in your specific notice as the controlling operational deadlines for producing records, meeting with the auditor, and responding to proposed findings. If SCDOR issues a Proposed Assessment and you disagree, its appeals guidance says a written protest must be filed within 90 days of the date listed on the notice. The Department says that if the 90th day falls on a weekend or state holiday, the deadline moves to the next business day. Confirm the current instructions on your notice and SCDOR’s appeals page, and do not wait until the last day to prepare a protest.
As a general assessment rule, SCDOR’s administrative materials describe a three-year period measured from the later of the return’s filing date or due date. The exact position here depends on your own facts, so it is worth confirming with the state directly or talking to us about your situation. The exact period can depend on the return, filing history, and applicable exception. Ask SCDOR or a qualified tax professional to confirm the lookback for the periods in your notice before agreeing to an extension.
Common issues in South Carolina sales tax audits
Auditors may test whether reported sales reconcile to order, accounting, bank, and payment-processor records; whether taxable sales were omitted; and whether the correct state and local tax treatment was applied to delivery destinations. For online sellers, differences between marketplace reports, direct-store orders, refunds, shipping records, and filed returns can prompt questions. A mismatch is not automatically proof of tax due, but it should be explained with transaction-level support.
Other recurring areas of review include unsupported exempt or resale sales, purchases on which use tax may be due, incorrect treatment of returns and discounts, incomplete invoices, and failure to separate wholesale from retail activity. South Carolina’s local taxes have distinct county or municipal rules, and certain large purchases such as vehicles are subject to a tax cap. Check the transaction-specific rule rather than applying one general rate or assumption to every sale.
South Carolina local taxes and transaction treatment
SCDOR states that South Carolina has a statewide sales tax and that counties and municipalities may impose additional local taxes. Retailers report and pay local taxes with the state sales tax return. The applicable local treatment can depend on where a sale is delivered and on the particular local tax’s restrictions, so an ecommerce seller should retain destination and delivery evidence for each order.
Local tax schedules and rules can change. Use the current SCDOR materials and the tax treatment applicable to the transaction rather than relying on an old rate table or a customer’s billing address alone. South Carolina also caps tax on certain large purchases, including vehicles; the cap is not a general exemption from sales tax. For a disputed transaction, assemble the invoice, item description, delivery or registration details, and calculation used, then ask SCDOR or your representative to verify the current rule.
Dispute an assessment or appeal an audit result
You can dispute a proposed assessment by filing a written protest within the 90-day period stated by SCDOR. Explain which findings you contest, the facts and records supporting your position, and the correction you believe is appropriate. Identify the tax periods and issues clearly, attach relevant evidence, and follow the submission instructions on the notice. You may agree with some items and dispute others; make the distinction explicit and confirm how any undisputed amount should be handled.
SCDOR’s appeals guidance says a timely protest prevents collection action while the protest is being resolved. If you agree with the audit result but cannot pay in full, the Department’s audit process describes returning a signed SC-870 to the auditor or supervisor; signing it means agreeing to the tax, interest, and penalties and waiving further appeal rights. Do not sign an agreement or payment document without understanding its effect. The notice and current SCDOR appeals instructions control the steps for your case.
Potential penalties and consequences of uncollected or unpaid tax
A business that did not collect tax may still face an assessment for tax due, along with applicable interest and penalties. Whether tax was legally due depends on the transaction, location, exemption evidence, and other facts; a seller should not assume that a customer’s failure to pay or a marketplace report resolves the seller’s obligations. If tax was collected but not remitted, reconcile the collected amounts to returns and payments and address the discrepancy promptly.
SCDOR’s administrative materials describe penalties for late filing and late payment, as well as interest on unpaid sales and use tax. The amount depends on the circumstances and the current rules, so this page does not estimate a balance or promise that a penalty will be removed. An assessment notice should state the tax, penalty, interest, and payment or appeal instructions. Review each component and raise documented errors through the stated process.
Prepare for the audit closing conference
Before the closing conference, request or review the auditor’s proposed adjustments and organize your response by issue. For each adjustment, note the transactions or periods involved, the auditor’s calculation, your supporting records, and any factual or legal disagreement. Bring a concise reconciliation that connects source records to filed returns, and identify any items you accept separately from those you dispute.
Use the meeting to clarify assumptions, sampling methods, local tax assignments, and how the auditor treated exemptions, refunds, and marketplace transactions. Ask what documents remain outstanding and when SCDOR expects to issue its findings. Afterward, send a short written summary of agreed points, unresolved questions, and any promised follow-up documents so the record is clear.
Resolve the audit and plan your next steps
When the audit concludes, compare the final packet with your records and decide whether to pay, seek an available payment arrangement, or protest the proposed assessment. Check the notice for the exact deadline and submission method. If you accept the result, confirm the balance and payment instructions; if you disagree, preserve your appeal rights by filing a complete written protest on time.
After resolution, correct the underlying process that caused the issue. Review destination data and local tax mapping, exemption-document collection, reconciliation between sales channels and returns, and controls for tax collected but not remitted. South Carolina business tax registration and account tasks are handled through MyDORWAY. Keep audit workpapers and supporting records with your tax files, and verify current retention and filing requirements with SCDOR.
Get hands-on help defending your South Carolina audit
A sales tax professional can help interpret the notice, organize records, reconcile ecommerce data, test local tax treatment, prepare explanations, and develop a documented response to proposed adjustments. Representation can be especially useful when the audit spans multiple periods, involves several sales channels or states, includes a sampling method you do not understand, or may lead to a significant assessment. Confirm that the person assisting you is qualified for the work and authorized to communicate with SCDOR where required.
Sales Tax Compliance USA is a done-for-you service staffed by people, not a software product. We can help sellers prepare records, review audit issues, and coordinate a response based on the facts and current SCDOR requirements. No outcome can be guaranteed, and the right approach depends on your notice, records, and transactions. Contact us with the notice and audit period details, or confirm procedural questions directly with the South Carolina Department of Revenue.
Not sure how this applies to your business? We handle US sales tax registration, filing and remittance for ecommerce sellers as a fully managed service, for one fee. Book a free consultation and we will review your own position with you.
South Carolina transaction and record checks that can affect audit treatment
| Audit area | South Carolina-specific check | Useful supporting records |
|---|---|---|
| State and local tax | State tax may be supplemented by county or municipal taxes; local rules and rates vary. | Delivery address, order detail, tax calculation, current SCDOR local-tax schedule |
| Municipal destination | For deliveries within a city or town, SCDOR’s local-tax schedule instructs retailers to use the city or town code rather than the general county code. | Ship-to address, carrier tracking, destination code used on the return |
| Vehicle purchase | Certain large purchases, including vehicles, are subject to a tax cap; verify the transaction-specific cap and calculation. | Invoice, vehicle description, registration or delivery details, tax calculation |
| Exempt or resale sale | An exemption or resale position should be supported by records appropriate to the transaction. | Customer documentation, invoice, exemption or resale support, order records |
| Wholesale and retail records | SCDOR’s policy materials call for separate records; absent separate records, sales may be presumed retail. | Sales journals, customer classifications, invoices, general-ledger detail |
Frequently asked questions
What should I do if I receive a South Carolina sales tax audit notice?
Read the notice for the audit periods, requested records, auditor contact, and response instructions. Preserve relevant records, make a deadline calendar, and ask the auditor promptly about anything unclear or any extension you need. Keep copies and a submission log, and get professional help before responding if the issues are complex.
How far back can South Carolina audit sales tax returns?
SCDOR’s administrative materials describe a general three-year assessment period measured from the later of the return’s filing date or due date. This one varies by seller and by state, and it is the kind of detail we check for clients as part of the service — get in touch and we will confirm where you stand. Confirm how the rule applies to your specific returns and audit notice with SCDOR or a qualified tax professional.
How long do I have to appeal a South Carolina sales tax assessment?
SCDOR says a written protest of a Proposed Assessment must be filed within 90 days of the date listed on the notice. If the 90th day is a weekend or state holiday, the deadline moves to the next business day. Follow the notice’s current filing instructions and submit early enough to confirm receipt.
What records can South Carolina request during a sales tax audit?
SCDOR may examine books and records relevant to whether taxes were reported correctly. This can include returns, sales and purchase invoices, accounting records, electronic order and payment data, shipping and delivery records, exemption support, and records of refunds or credits. The specific request in your Audit Request notice defines what you should produce.
Can I dispute or protest a South Carolina sales tax audit assessment?
Yes. You can file a written protest of a Proposed Assessment within the 90-day period stated by SCDOR, explaining the disputed findings and supporting your position with facts and records. A timely protest pauses collection action while the protest is resolved, as described by SCDOR. Do not sign an agreement that waives appeal rights unless you intend to accept the result.
What happens if a business didn’t collect or remit South Carolina sales tax?
If tax was due, SCDOR may assess the unpaid tax, applicable interest, and penalties, even when the business did not collect it from the customer. If tax was collected but not remitted, reconcile the amounts and address the shortfall promptly. The result depends on the transactions and circumstances, so review the notice and current SCDOR rules rather than assuming a fixed outcome.
What are common issues found in sales tax audits?
Common review areas include sales that do not reconcile to returns, incorrect destination-based local tax treatment, unsupported exemptions or resale sales, possible use tax on purchases, and incomplete records for refunds or credits. Ecommerce audits may also compare marketplace, direct-store, payment, and shipping data. These are areas auditors may examine, not a conclusion that a particular transaction is taxable.
Should I hire a sales tax professional to represent me in an audit?
Consider professional help if the audit covers multiple periods or channels, involves local tax or exemption questions, uses a sampling method you cannot evaluate, or could result in a material assessment. A professional can organize records, test calculations, prepare a written response, and help protect deadlines. Confirm the representative’s qualifications and authority to act for you; no representative can guarantee an audit outcome.
How we handle this for you
The mechanics in South Carolina are manageable on their own; the cost is the time it takes every single filing period, in every state you are registered in. We are a managed service: our team registers you with the South Carolina Department of Revenue, prepares and files your returns, and keeps you compliant period after period. You get one point of contact and one invoice — you do not get another dashboard to learn.
See our sales tax compliance services, check where you have obligations with the nexus calculator, or talk to us about South Carolina.
Official sources
- https://dor.sc.gov/notices-compliance/audit-process
- https://dor.sc.gov/notices-compliance/appeals-process
- https://dor.sc.gov/sites/dor/files/Documents/Policy%20Manuals/Chapter%2022%20-%20Administrative%20Requirements.pdf
- https://dor.sc.gov/sales-use-tax-index/local-sales-taxes
- https://dor.sc.gov/sites/dor/files/forms/ST389.pdf
Reviewed by Paul le Roux, CA(SA). Sales Tax Compliance USA handles US sales tax registration, filing and remittance for cross-border and domestic ecommerce sellers as a fully managed service.
This page is general information for educational purposes and does not constitute legal or tax advice. Sales tax rules change and depend on your specific facts. Consult a qualified tax professional about your own position.
Related guides
Other South Carolina guides: Amazon FBA · Back sales tax · Economic nexus · Filing · Foreign sellers · Permit
Audit defence in nearby states: North Carolina · Georgia
Selling into several states? Check where you have crossed a threshold with the free nexus diagnostic, see the full 51-state threshold table, or browse every state guide.