Korean Tax Invoices for Foreign Freelancers: What Clients May Ask You to Issue

A foreign freelancer in Korea may complete a project and send the client a normal invoice in English. The client may then reply by asking for a tax invoice, business registration certificate, withholding information, or a different payment document.

This is not always a request for a prettier invoice. Korea separates ordinary commercial invoices, electronic tax invoices, cash receipts, card records, and withholding documents according to the type of business and transaction.

Before promising to issue anything, confirm your legal work status, business registration, tax classification, and whether the client is purchasing from a registered business or paying an individual service provider.

What is a Korean tax invoice?

A Korean tax invoice, called a segeumgyesanseo, is a formal value-added-tax document used in qualifying business transactions.

An electronic tax invoice can be issued and transmitted through Korea’s tax system. The National Tax Service describes it as an online system for issuing and distributing tax invoices and transmitting the information to the NTS.

It is not the same as a simple PDF invoice created in Word or an accounting app.

A commercial invoice can explain the work, amount, bank information, and payment deadline. A Korean tax invoice has a defined tax purpose and depends on the issuer’s registration and VAT status.

Not every freelancer can issue one

Being paid for freelance work does not automatically mean you can issue a VAT tax invoice. The answer can depend on:

• Whether you are legally allowed to perform the work
• Whether you are registered as a business
• Type of business registration
• Whether the activity is VAT-taxable or exempt
• Whether the client is a business or individual
• Whether payment is treated as business revenue or personal service income
• Current tax rules and reporting requirements

A person without the correct business setup should not borrow another company’s registration number or create a fake tax invoice.

Foreign residents should check visa and work-permission questions separately from tax registration. Having a visa that permits residence does not necessarily answer whether a specific paid activity is allowed.

Why clients request tax invoices

A Korean business may need appropriate supporting documentation to record a purchase, claim input VAT where eligible, complete internal accounting, or pass an audit. The client may ask for:

• Business registration certificate
• Electronic tax invoice
• Bank account under the registered name
• Contract
• Delivery or completion confirmation
• Quotation
• Transaction statement
• Withholding documentation

Large companies often have strict vendor-registration processes. A project manager may want to pay you quickly, while the finance department cannot process payment until the documents match its accounting system.

Ask about documentation before beginning the work.

VAT should not be added casually

Some freelancers quote a project price and later discover the client expected VAT to be included. Others add 10 percent without confirming whether they are registered or whether the service is taxable.

Your quotation should state clearly whether the price:

• Includes VAT
• Excludes VAT
• Is exempt from VAT
• Will be subject to withholding
• Is paid as a total gross amount
• Requires reimbursable expenses

Do not copy another freelancer’s wording without understanding your own tax status. If the contract says “1,000,000 won including VAT,” the commercial result differs from “1,000,000 won plus VAT.”

Individual service payments may use withholding instead

A company paying an individual may process the payment using withholding rather than receiving a tax invoice.

Foreign residents often hear the expression “3.3 percent freelancer tax,” but that phrase is an oversimplification. The proper treatment depends on the actual income category, residence status, contract, and work relationship.

A company should not label a genuine employee as a freelancer merely to simplify payroll. Likewise, a truly independent business transaction should not automatically be treated like wages.

Ask the payer to explain:

• Income category
• Gross amount
• Withholding amount
• Net payment
• Document it will issue
• Tax filing implications

Keep the statement of payment or withholding record.

Business registration comes before invoicing

A freelancer planning regular commercial activity in Korea may need to consider business registration.

The National Tax Service provides forms for individual business registration and English tax-related certificates. It also explains that business-registration matters can be handled through district tax offices.

Registration is not only an invoicing decision. It can affect:

• VAT
• Income tax
• Business bank account
• Bookkeeping
• Expense records
• National insurance
• Address use
• Visa compliance
• Client contracts

Do not register a business solely because one client requests an invoice without checking the broader obligations.

What information a client may need

A registered business transaction may require details such as:

• Legal business name
• Representative name
• Business registration number
• Registered address
• Business category
• Client’s business information
• Supply date
• Supply amount
• VAT amount
• Email for electronic delivery

Names and numbers must match the registration documents. Using an English brand name when the registered Korean legal name is different can cause accounting delays. Send clients a current business registration certificate instead of typing the information from memory.

Foreign clients may require a different invoice

A Korean freelancer working for an overseas client may need to issue an ordinary commercial invoice rather than a Korean domestic tax invoice. The document may include:

• Supplier name and address
• Client details
• Invoice number
• Description of service
• Service period
• Currency
• Payment deadline
• Bank or remittance details
• Tax wording
• Contract reference

Cross-border services can create additional VAT, foreign-exchange, tax-residence, and reporting questions. Do not assume that payment to an overseas account removes Korean reporting responsibilities when the work is carried out from Korea.

Build a documentation workflow

Before starting a project, confirm:

1. Contracting party
2. Legal work permission
3. Business-registration status
4. VAT treatment
5. Withholding treatment
6. Required payment documents
7. Gross and net amount
8. Payment date
9. Expense reimbursement
10. Currency and bank fees

After completion, save the signed contract, work evidence, invoice, tax invoice or withholding record, bank deposit, and client correspondence.

Freelancers often lose time because accounting questions appear only after the work is finished. A ten-minute documentation discussion before the project can prevent weeks of delayed payment.

When professional advice is necessary

Seek current professional guidance when:

• You have several Korean clients
• Income is paid from multiple countries
• You are unsure whether registration is required
• Your visa has work restrictions
• You sell digital services internationally
• The client insists on a document you cannot legally issue
• A company treats you as a freelancer despite employee-like control
• VAT or withholding treatment is unclear

The correct answer depends on the full facts. A tax invoice is not simply a receipt that anyone can create.

Quick Summary

• A Korean electronic tax invoice is an official tax document, not an ordinary PDF invoice.
• Whether you can issue one depends on business registration and the tax treatment of the service.
• Some individual freelance payments may be processed through withholding instead.
• Confirm documentation, VAT, gross payment, and legal work status before starting the project.