🇰🇷 Payments in South Korea

Credit card dominance, and the tax lever behind it

South Korea pays for a larger share of its retail purchases by card than any comparable market. This dominance has tax roots, in a policy launched after the 1997 Asian financial crisis. The government wanted to make merchant revenue traceable, so it gave households a tax break for paying by card. The income tax deduction for card spending is set out in Article 126-2 of the 조세특례제한법, the Restriction of Special Taxation Act. It applies only to the portion of annual spending above 25% of gross salary. The rate then depends on the payment instrument used.

The 현금영수증, or cash receipt, is a named record of a cash purchase. The 국세청, Korea’s National Tax Service, introduced it in 2005 to close the gap at the cash end. A consumer paying in cash asks for a receipt linked to their phone number. The purchase then qualifies for the same deduction as a debit card payment. Certain designated trades must issue one automatically above KRW 100,000, without the customer having to ask. The decline of anonymous cash therefore stems from this tax treatment, which limits the deduction to spending the tax authority can see.

The payment mix varies sharply with the payer’s age. Among people aged 60 and over, credit cards account for 52.1% of transactions and cash for 30.2%. Among people in their twenties, the credit card share falls to 38% and mobile cards rise to 36.8% (Bank of Korea, 2024 survey). The shift from one generation to the next is in the card’s form factor, which moves from plastic to a wallet on a phone. The underlying instrument stays the same. An acceptance project for the Korean market is therefore about how the card is presented, not about replacing it with another instrument.

KFTC: a single operator for all retail rails

The Korea Financial Telecommunications & Clearings Institute (금융결제원, KFTC) is the nonprofit, owned by its member banks, that operates all of Korea’s retail interbank rails. This concentration sets Korea apart from markets where several clearing houses split the work. Above the KFTC sits a single settlement layer: BOK-Wire+ (한은금융망), the hybrid RTGS system run by the Bank of Korea since 1994. All net positions calculated by the KFTC settle there in central bank money. This separation between clearing and settlement partly explains why Korean retail payments are so fast. The beneficiary is credited without waiting for interbank settlement, which happens later on BOK-Wire+.

오픈뱅킹 (Open Banking) is the API gateway through which third-party providers access accounts held at Korean banks. It launched in 2019 at the initiative of the Financial Services Commission (FSC), and the KFTC operates it. From day one, it covered balance inquiries and transfer initiation on accounts at every bank, through a single interface. The interbank access fee was cut by an order of magnitude at launch. That is how Toss, Kakao Pay, and Naver Pay could offer payment services without negotiating a connection with each bank. This opening explains why fintechs own so much of the customer-facing side of Korean payments.

The same Bank of Korea annual report sets out the other projects under way. The collateralization ratio for net settlement is rising from 90% to 100%, and ISO 20022 adoption is targeted for the second quarter of 2026. This has three practical consequences for companies exposed to the won. Longer BOK-Wire+ hours widen the windows for submitting settlements. Full collateralization tightens collateral requirements for net settlement participants. Finally, the new message format means reworking the field mappings between a foreign accounting system and the new standard.

VAN and PG: the two layers you collect through

The Korean acceptance chain has two layers of intermediaries between the merchant and the issuing card company, each specializing in one sales channel. In stores, VAN companies carry authorization requests and batches from the terminal. Nice Information & Telecommunication, KIS Information, KICC, and Smartro have filled this role since 1990. Online, PGs (payment gateways) contract directly with the merchant. Four names come up most often: KG Inicis (KG Group, listed on KOSDAQ under ticker 035600), NHN KCP, Toss Payments, and Danal. A survey of the Korean market limited to VANs therefore misses the entire online collection chain.

The billing key is a reusable identifier issued by the PG and linked to the payment method a cardholder registered the first time. Korean merchants therefore do not store the card number. They present this key to the PG at each subscription billing date. This architecture makes the merchant’s stock of keys dependent on the provider that created it. Switching PGs therefore involves the keys as much as the technical interfaces. Existing keys cannot be transferred as they are, and migration requires cardholders to re-register. Exit terms therefore need to be negotiated in the first contract.

• Nine licensed card companies (여신전문금융회사) issue cards in Korea: Shinhan, Samsung, KB Kookmin, Hyundai, Lotte, Hana, Woori, NH Nonghyup, and BC.
• BC Card issues and processes cards for about 10 banks that have no card subsidiary, and is the country’s largest acquirer, with an estimated acquiring share of 42.6% in 2023 (industry source, not cross-checked against an FSS report).
• The number of credit cards in circulation is estimated at about 130 million in 2023 (Statista), for a population of about 51 million.
• The merchant contract includes an obligation to accept: a card-accepting merchant does not choose which cards it honors.

A merchant fee set by the regulator, not negotiated

For most of the market, the acceptance fee a Korean merchant pays is set by regulation. The FSC calculates a benchmark cost, the 적격비용, and derives preferential rates for small and medium-sized merchants from it. The scope of these rates has widened in stages. In 2012, it covered merchants with revenue of up to KRW 200 million; since 2018, it has covered those with up to KRW 3 billion. On December 17, 2024, the FSC announced a further cut and a change of method. The benchmark cost will in principle be recalculated every six years instead of every three, with a possible review every three years depending on economic conditions.

Above KRW 3 billion in revenue, the rate becomes contractual again, but it remains anchored to the benchmark cost, so there is little room to negotiate. Simple payment services charge their own fee on top of the card chain’s fee. The Financial Supervisory Service (FSS) now requires these operators to publish their fees every six months. The report published on April 28, 2026, covering September 2025 to February 2026, gives the average rates by type of operator.

Installment payments (할부): a credit product, with consumer recourse

할부 refers to installment payments that a Korean cardholder chooses at the moment of the transaction. It is consumer credit extended by the issuing card company, normally with interest paid by the cardholder. The practice is long-established and widespread in Korean retail. The cardholder sets the repayment schedule at authorization, most often 2 to 12 months. The card company pays the merchant on the usual schedule, then collects from the cardholder month by month. The merchant’s cash flow is therefore unaffected by the installment term the customer chooses.

Interest-free installment plans shape entire sectors of Korean retail. In home appliances, furniture, travel, education, and beauty, the “six months interest-free” campaign works as a deferred discount for the consumer. Its cost is negotiated campaign by campaign with each issuer and comes on top of the acceptance fee. Any comparison of Korean processing costs with another market therefore understates the total as long as this item is left out.

• Withdrawal: Article 8 of the same act provides a seven-day cooling-off period, starting from receipt of the contract or delivery of the goods, as applicable.
• Withdrawal must be notified in writing to both the seller and the lender, and takes effect on the date it is sent.
• The right of withdrawal is excluded for certain goods: motor vehicles, goods requiring professional installation, sealed or made-to-order products, and goods that lose value once used.
• As with the right to withhold payment, withdrawal is subject to a minimum amount: small transactions are excluded.
• These two remedies coexist with card disputes. They follow different formal rules and different deadlines.

Three separate complaint channels lead back to the same Korean merchant, each with its own deadlines and formal requirements. Card disputes are handled by the issuer. The seven-day withdrawal right comes from the Installment Transactions Act. The right to withhold payment covers only installments not yet paid. A dispute management tool built only for card disputes therefore does not cover the other two, which need their own tooling from the day Korean customer service opens.

Naver Pay, Kakao Pay, Toss, Samsung Pay: who owns the customer interface

In Korea, simple payment (간편지급) means a payment triggered from an app in which the payment method has already been stored. It is now the main payment channel for Korean e-commerce, and its split among types of providers reveals the structure of the market. The 전자금융업자, meaning fintechs, account for 54.9% of value, up 4.4 percentage points year over year. Financial institutions hold 23.7% and phone manufacturers 21.5%. In card-based simple payment alone, the gap widens further: 72.5% for fintechs versus 27.5% for card companies (Bank of Korea, March 20, 2026). Korean banks hold the accounts, but for the most part they do not control the interface through which the cardholder pays.

MST is the module that emulates the magnetic stripe, letting a phone pay at a terminal without NFC. Samsung dropped it from its global models starting with the Galaxy S21 in 2021, while keeping it longer on devices sold in Korea. As long as MST worked, Korean merchants had no reason to install NFC at the point of sale, since phones already paid at their magstripe terminals. The terminal base therefore stayed magstripe long after the rest of the world moved on. As the module is phased out, mobile acceptance is shifting to NFC and contactless EMV. Contactless capability across Korean terminals must therefore be checked terminal by terminal, never assumed.

What is open to foreign players, and what remains closed

Foreign payment providers entering Korea run up against a complete domestic infrastructure rather than a regulatory ban. Apple Pay illustrates the point. The service launched in March 2023 with Hyundai Card as its only partner issuer, after a one-year exclusivity period. Three years later, no other issuer offers it. Shinhan Card and KB Kookmin Card considered adopting it but never did, for lack of agreement on costs and on rolling out NFC terminals (Seoul Economic Daily, July 2, 2026).

Three cross-border channels remain open to foreign players, and each must be handled separately. The first is inbound tourist spending, served by local PGs and VANs that accept the major Asian networks, led by Alipay and WeChat Pay. The second is outbound spending by Korean cardholders. Kakao Pay routes its overseas payments through the Alipay+ network, which gives merchants outside Korea an acceptance channel without a local contract. The third is money transfer. A 2017 amendment to the 외국환거래법, the Foreign Exchange Transactions Act, created the 소액해외송금업 (small-sum overseas remittance) license, under which Sentbe and Wirebarley operate.

The won cannot be traded freely outside Korea, and this FX constraint governs all cross-border treasury. A Korean collection settles in won, into an account held in Korea, and is converted only afterward. The offshore won settlement project that the Bank of Korea announced for 2027 targets this limitation. It will not lift exchange controls. It will change where the currency becomes available to a nonresident operator, which is enough to reshape the treasury setup of any foreign group operating in Korea.

Compliance, settlement of funds, and what breaks in production

The settlement failure of summer 2024 triggered Korea’s reform of fund safeguarding. The 티몬 (Timon) and 위메프 (WeMakePrice) marketplaces stopped paying their sellers, leaving tens of thousands of merchants without payouts. Their model was known to be fragile: it combined very long settlement periods with holding funds without segregation. The money owed to sellers was not separated from the platform’s own cash. Lawmakers responded by amending the 전자금융거래법 (Electronic Financial Transactions Act), passed in late November 2025 and promulgated on December 16, 2025.

This timetable has two distinct effects depending on where you sit in the chain. For merchants, the payout period in the PG contract becomes an enforceable obligation, backed by safeguarded funds that cannot be reached by set-off or attachment. For a foreign PG seeking a Korean license, the law raises capital and tied-up cash requirements in stages. Settlement funds must be fully safeguarded two years after the law takes effect.

Payer authentication in Korea falls under two separate regimes: electronic signatures and identity verification. The monopoly of the 공인인증서 public certificate ended with the amended Digital Signature Act, which took effect on December 10, 2020; the certificate requirement for online payments had been lifted earlier. That did not make the Korean checkout neutral. Identity verification commonly relies on a Korean phone number linked to a registration number, which nonresident buyers do not have. A checkout aimed at international customers must therefore offer an alternative path. Without one, buyers who lack a Korean identity cannot complete their orders.

• No local contract, no domestic collection. An international acquiring contract covers only cards issued outside Korea.
• The rate is not a lever. The FSC sets the fee; the instrument mix, by contrast, is entirely in your hands.
• Recurring billing depends on the PG. The billing key (빌링키) cannot be ported as is: negotiate your exit when you sign up.
• Do not assume contactless. Korean terminals stayed magstripe as long as MST worked; check NFC capability point of sale by point of sale.
• Three dispute channels, not one. Card disputes, the seven-day withdrawal right, and the right to withhold installment payments: three sets of formal rules, three sets of deadlines.
• Interest-free installments are an expense. Budget them by campaign and by issuer, on top of the acceptance fee.