To start a sole proprietorship in South Carolina, you simply begin doing business. The state requires no formation filing, no articles, and no charter. You are the business the moment you take your first client or make your first sale. The catch is that the law draws no line between you and the business, so your personal bank accounts, car, and home equity sit behind every business debt and legal claim. Everything below is about the housekeeping that turns “I’m working for myself” into a business the IRS, the South Carolina Department of Revenue, and your local city hall will recognize.
Pick a Name (or Skip This Step)
If you work under your own legal name, there is nothing to do here. A graphic designer named Maria Torres who invoices clients as “Maria Torres” has no naming paperwork at all.
If you want to trade under something else, like “Lowcountry Design Co.,” South Carolina will not register that fictitious name for you. The state has no DBA registry, and there is no county clerk or Register of Deeds filing for assumed names either.1South Carolina Business One Stop. Registering with the Secretary of State The practical workaround is to list your trade name on your federal EIN application; most banks accept that documentation when you open a business account.
Search before you commit. The Secretary of State keeps a free business entity search where you can check whether a corporation or LLC already holds the name.2South Carolina Secretary of State. Business Name Search Picking something that mirrors a registered business invites a trademark fight, DBA registry or not.
EIN or Social Security Number?
A sole proprietor with no employees and no obligation to file excise or certain other federal returns can use a personal Social Security Number for every tax purpose. The moment you hire anyone, you must get an Employer Identification Number from the IRS.3Internal Revenue Service. Employer Identification Number Plenty of sole proprietors get an EIN anyway. Banks sometimes ask for one on a business account, and using an EIN on invoices and W-9s keeps your SSN out of circulation. The application is free and takes about five minutes online.
State and Local Licensing
South Carolina regulates dozens of professions through boards housed under the Department of Labor, Licensing and Regulation, from accountants and architects to contractors, cosmetologists, real estate agents, veterinarians, and much of healthcare.4South Carolina Department of Labor, Licensing and Regulation. Professions and Occupations If your trade shows up on that list, you need the professional license in hand before you serve the public. Fees and continuing-education rules vary by board.
Separate from any professional license, nearly every business in South Carolina needs a local business license from the city or county where it physically operates. Fees and forms differ by jurisdiction, though many participating governments accept the Standardized Business License Application published by the Municipal Association of South Carolina.5South Carolina Business One Stop. Local Business License You still apply directly to your local government.
Planning to work from home? Call the city or county planning office before you print business cards. Most municipalities allow home offices and limited home-based businesses in residential zones, but they typically restrict signage, customer foot traffic, and on-site employees. A zoning violation can bring fines and an order to stop operating.
Register for Sales Tax If You Sell Taxable Goods or Services
If you sell tangible goods or certain taxable services, you need a Retail License from the South Carolina Department of Revenue before your first sale.6South Carolina Department of Revenue. Licensing – Retail License The license is $50 per location, does not expire, and must be updated if you move.7South Carolina Department of Revenue. Chapter 23 Frequently Asked Questions You apply through SCDOR’s MyDORWAY portal, which also issues your state tax ID.8South Carolina Business One Stop. Retail License
The statewide sales tax rate is 6%, and many counties and cities add local-option taxes on top of that for schools, transportation, and capital projects.9South Carolina Department of Revenue. Sales and Use Tax Index You collect both portions from customers and remit them to SCDOR. Most new businesses start on a monthly filing cycle until SCDOR reviews their history. A return is still due in months with zero sales.
Taxes You’ll Owe as a Sole Proprietor
A sole proprietorship is a disregarded entity for federal tax purposes, which means the IRS does not treat it as separate from you. You report all business revenue and expenses on Schedule C, which attaches to your personal Form 1040.10Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss from Business (Sole Proprietorship) The net profit from Schedule C adds to your other income for federal income tax and also drives your self-employment tax calculation on Schedule SE.11Office of the Law Revision Counsel. 26 USC 1401 Rate of Tax That same net profit flows to the state on Form SC1040, where South Carolina’s individual income tax rate is currently 6%.
Self-Employment Tax
This is the one that surprises first-timers. As an employee, your employer pays half of your Social Security and Medicare taxes. As a sole proprietor, you pay both halves. The combined self-employment tax rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.12Internal Revenue Service. Self-Employment Tax – Social Security and Medicare Taxes The Social Security portion only applies to the first $184,500 of net self-employment income in 2026; Medicare has no cap.13Social Security Administration. Contribution and Benefit Base On $100,000 of net profit, expect roughly $14,100 in self-employment tax alone, before any income tax.
Quarterly Estimated Payments
Because nobody is withholding anything from your income, both the IRS and South Carolina expect you to pay in quarterly installments due April 15, June 15, September 15, and January 15. Federally, you must make estimated payments if you expect to owe $1,000 or more after withholding and refundable credits. You avoid underpayment penalties by paying at least 90% of your current-year liability or 100% of your prior-year liability (110% if your prior-year AGI exceeded $150,000).14Internal Revenue Service. 2026 Form 1040-ES
South Carolina has its own threshold, and it is much lower: if you expect to owe $100 or more in state income tax, you must file quarterly on Form SC1040ES on the same dates as the federal payments.15South Carolina Department of Revenue. Individual Declaration of Estimated Tax Many sole proprietors assume the federal $1,000 threshold applies to the state and get hit with a penalty at filing time.
Personal Liability and How to Blunt It
The hardest part of a sole proprietorship is the lack of a legal barrier between the business and your personal wealth. If a customer sues, a creditor comes after unpaid invoices, or a contract goes sideways, your personal savings, car, and home equity are all reachable. If you are married, jointly held assets may be exposed too.
Two steps make a real difference. First, open a dedicated business bank account and run every business transaction through it. Sole proprietors without an EIN can usually open an account using just their SSN. Separating the money keeps your tax filing clean and gives you a usable paper trail if you ever face an audit or lawsuit. Second, carry business insurance appropriate to your work. A general liability policy covers common risks like a customer injury on your premises or property damage you cause. If you deliver professional services, errors-and-omissions coverage (also called professional liability insurance) handles claims that your work caused a client financial harm. Neither is legally required for most sole proprietors, but the gamble of going bare grows with your revenue.
What Changes When You Hire
Bringing on even one employee triggers registrations and insurance obligations that do not apply to solo work.
Unemployment Insurance
Register with the South Carolina Department of Employment and Workforce to set up a state unemployment insurance account and get an Employer Account Number for quarterly wage reporting and tax payments.16South Carolina Department of Employment and Workforce. Employer Page New employers pay a combined effective rate of about 1.06% on the first $14,000 each employee earns per year.17South Carolina Department of Employment and Workforce. Tax Rate Information Your rate adjusts over time with your claims history.
Workers’ Compensation
South Carolina law requires workers’ compensation coverage once you regularly employ four or more workers in the same business, or if your total annual payroll was $3,000 or more in the prior calendar year regardless of headcount.18South Carolina Legislature. South Carolina Code of Laws Title 42 Chapter 1 That count includes part-time and seasonal workers but not you. Coverage comes from a licensed carrier or by qualifying as a self-insured employer. Agricultural employees, licensed real estate agents working on straight commission with independent contractor agreements, and certain other categories are exempt.
New Hire Reporting
You must report every new hire to the State Directory of New Hires within 20 calendar days of the start date, using a W-4 or equivalent, by mail, fax, or electronic submission.19South Carolina Legislature. South Carolina Code Title 43 Chapter 5 Section 43-5-598
Paying Independent Contractors Instead
If you use freelancers rather than employees, you skip the unemployment and workers’ comp obligations for them, but you pick up a federal reporting duty. For tax years beginning in 2026, you must file Form 1099-NEC for any contractor you pay $2,000 or more during the year. That threshold rose from $600 to $2,000 for tax years beginning after 2025 and will adjust for inflation starting in 2027.20Internal Revenue Service. 2026 Publication 1099 General Instructions for Certain Information Returns
Keep Your Records
The IRS expects you to keep business records for at least three years from the date you file the return that reports the income. With employees, hold employment tax records for at least four years after the tax is due or paid, whichever is later.21Internal Revenue Service. How Long Should I Keep Records Storing digital copies of receipts, bank statements, and invoices for five years is a safe default that covers both federal and state audit windows.
Track expenses as they happen. Accounting software built for sole proprietors can link to your business bank account and categorize transactions automatically. That running record pays for itself the first time you fill out Schedule C, and it is your best defense if the IRS ever questions a deduction.