The first customer payment can make a new business feel real. It can also create a misleading picture of how much money is available to spend.
Part of that payment may be VAT. A supplier payment may include a creditable tax amount, a deductible expense or an asset that receives different treatment. Money transferred to the founder needs an explanation of its own. Hiring someone adds reporting and payment obligations that extend beyond their salary.
Understanding those distinctions early makes accounting more useful. You can price work, reserve cash and ask an accountant better questions before a filing deadline forces the conversation.
General information checked 22 September 2026. This article explains the main obligations; a Korean tax professional should assess the business, owner and transactions involved.
Start with who earns the income
An individual business, or 개인사업자, operates through its owner. Its business income belongs within the owner's income-tax framework. The relevant calculation considers business earnings and allowable expenses, alongside other applicable income and personal circumstances. Turnover alone does not tell you the tax bill. The National Tax Service includes business income within its individual income-tax guidance.
A corporation has its own tax position. A Korean corporation does not become a foreign corporation simply because its shareholder is foreign. NTS distinguishes the taxation of domestic and foreign corporations by the entity's status, rather than the owner's passport.
The owner's income then needs separate attention. Salary, dividends, repayment of a documented loan and reimbursement of a business expense describe different transactions. They require appropriate treatment and records. An unexplained transfer from the company account should not become the founder's routine way of paying personal bills.
For an individual business, taking cash out for living costs is also different from incurring a deductible business expense. Explain your intended withdrawals to the accountant instead of assuming money becomes taxable only when you move it to a personal account.
This is why “Which structure pays less tax?” needs a model of both business and owner. Include expected profit, other income, residence, money retained for operations and money the founder needs personally. Our sole proprietor versus corporation guide covers the wider decision.
Understand what VAT does to a payment
Korea's standard VAT rate is 10%. Under the general VAT system, a business accounts for VAT on taxable sales and can offset eligible VAT on purchases. Some supplies are exempt or qualify for different treatment, and eligible small individual businesses can fall within a simplified regime. Your registration category and actual activity matter. See the NTS VAT overview.
Consider a hypothetical design studio registered as a general VAT taxpayer. It supplies a taxable service for KRW 1,000,000 plus KRW 100,000 VAT. The customer transfers KRW 1,100,000.
The studio's sales revenue in this example is KRW 1,000,000. The extra KRW 100,000 is VAT collected, with a corresponding tax obligation.
During the same period, the studio purchases taxable supplies for KRW 400,000 plus KRW 40,000 VAT. Assume that purchase is wholly eligible for input credit and supported by the required evidence. With no other transactions or adjustments:
- KRW 1,000,000. Treatment in this simplified example: Sales revenue before expenses.
- KRW 100,000. Treatment in this simplified example: VAT charged on the sale.
- KRW 40,000. Treatment in this simplified example: Eligible VAT credit on the purchase.
- KRW 60,000. Treatment in this simplified example: VAT remaining payable after that credit.
The studio pays its supplier KRW 440,000 and sets aside KRW 60,000 for the remaining VAT liability. From the customer's KRW 1,100,000 payment, that leaves KRW 600,000 before other expenses and income tax. The VAT credit does not turn the supplier's whole bill into a refund.
Eligibility is essential. Korea's VAT Act, Article 39 excludes specified input taxes, including certain non-business spending and purchases lacking the required documentation, subject to the relevant exceptions. A receipt and a business bank payment do not establish that every tax amount can be credited.
When quoting, make clear whether the amount includes VAT. In cash planning, identify the estimated VAT liability separately so that money needed for a return is not mistaken for operating runway.
Build a filing calendar around the actual business
VAT and income tax follow different reporting cycles. General VAT taxpayers have periodic obligations during the year; the pattern differs between individual businesses and corporations, with special arrangements for some smaller corporations. The simplified VAT regime has its own schedule. Annual income-tax work does not replace these filings.
Ask the accountant to give you a calendar for your registered category, accounting year and payroll. Include national and applicable local tax, interim payments, document deadlines and who authorises payment. The useful date for you may be the document handover several weeks before a statutory deadline.
Update that calendar when the business hires, changes category, begins a new activity or closes. A quiet trading period is a reason to ask what must still be filed, rather than assume every obligation has paused.
Make invoices and books part of delivery
A customer may need a Korean tax invoice, 세금계산서, with the correct supplier and transaction details. Electronic tax invoices are part of the official tax-reporting system; emailing an ordinary PDF invoice is a different action.
NTS identifies corporations and qualifying individual businesses as subject to electronic tax-invoice obligations. The rules include thresholds, timing and continuing obligations for individual businesses. Confirm your position when registering, then agree who issues invoices, checks incoming invoices and corrects mistakes. Different transactions can require different evidence.
Bookkeeping connects those documents to what happened. An entry should explain what was supplied or purchased, by whom, for how much and for what business purpose. Bank statements show movements of money, but may not explain whether a deposit was revenue, a loan, capital or a refundable amount.
Small businesses also need records. NTS offers simplified bookkeeping guidance for qualifying individual businesses; eligibility depends on the activity and scale, with exceptions. Simpler books still require evidence.
Create a monthly routine: reconcile the bank and payment-service records, collect supplier documents, explain unusual transactions and resolve missing information. Separate personal spending from company spending. For the practical account setup, see our business banking guide.
Paying people creates another workflow
When a business pays employment income or certain other types of compensation, it can have duties to withhold tax, report the payment and remit the amount withheld. These duties can apply to individual businesses as well as corporations. The NTS withholding overview explains the payer's role.
Set up that process before the first payroll run. Give the accountant the agreed compensation, worker details, start date and relevant benefits. Ask what information statements and year-end work will be required, and what changes when someone leaves.
A payment to an independent professional needs its own classification. Do not apply a familiar “freelancer rate” to every service invoice, or assume calling someone a contractor resolves their employment position. The work arrangement, income type and recipient matter.
Hiring also brings social-insurance questions. Korea's four principal schemes are national pension, national health insurance, employment insurance and industrial accident compensation insurance. They have different coverage rules and can create employer contributions and reporting work beyond the agreed salary.
Foreign nationality does not create a general exemption. NPS guidance identifies pension exclusions linked to circumstances including nationality, status and social-security agreements. NHIS guidance explains foreign employees' workplace coverage and conditional exclusions. Have the relevant professional or agency check each person's position across the applicable schemes, including the working founder's own position.
Know what you are hiring a 세무사 to do
A 세무사, or Korean tax accountant, can help organise the business's records, prepare tax filings and advise on tax treatment. The Certified Tax Accountant Act sets out a remit that includes bookkeeping for tax returns, tax advice and representation in specified tax matters.
Your agreement determines which of those services you are buying.
Bookkeeping records and reconciles transactions. Tax filing turns the relevant information into returns and supporting submissions. Tax advice examines a proposed arrangement or uncertain treatment before you act. A recurring bookkeeping fee should not be assumed to include a detailed international tax opinion.
Company contracts, employment disputes and immigration applications may need other professionals. Nor does accurate tax filing establish whether your pricing or business model works. A helpful adviser should be clear about the boundary of the assignment and when another specialist is needed.
Ask who will answer routine questions, in which language, and how quickly. Confirm whether payroll, social-insurance administration, annual returns, corrections and responses to tax-office enquiries are included or separately charged. Agree the document format and retain access to your books, filed returns and supporting records.
Bring cross-border facts into the first conversation
An overseas owner, a foreign client and an overseas supplier create different questions. Give the accountant a map of the parties and payments before describing everything as “international business.”
Personal tax residence requires attention to the actual facts. NTS's residence guidance considers domestic residence and personal connections; a foreign passport alone does not answer the question. The treatment of overseas income also needs assessment against the applicable rules and circumstances.
For a payment abroad, identify what it buys, where the work occurs and who receives the income. Services, interest, dividends and royalties can have different treatment. Tax treaties can affect the result, but eligibility and documentation matter. NTS explains this in its nonresident withholding guidance.
If a related overseas company provides management, software or other services, ask what supports the charge and its pricing. If the foreign business has people working or concluding business in Korea, ask whether that activity creates a Korean taxable presence. These are matters to investigate before agreeing contracts and moving funds.
Questions to ask before choosing a structure
Bring projected sales, costs, owner withdrawals, staffing and cross-border payments to the meeting. Then ask:
- Which taxes and registrations apply to these activities and this owner?
- How would an individual business and a corporation differ after considering owner payments, retained profit and accounting costs?
- Which VAT category fits, and how should prices and invoices show tax?
- What records establish expenses and any input-VAT credits?
- What must happen before paying staff, contractors or overseas parties?
- Which national and local filings, payroll tasks and insurance services are included in the fee?
- Which issue needs specialist advice before I sign or pay?
The practical outcome should be a clear division of work: what you document, what the accountant prepares, what you review and when money must be available. That arrangement helps the business understand its finances while there is still time to make decisions.
Cover: Part of a customer payment may need to be set aside for tax obligations. Cover illustration created with AI for PIN Insights.