South Korea's crypto asset income tax may be postponed again, but traders still need to keep records of their cost base.

South Korean officials are discussing postponing again the collection of income tax on crypto assets, which was originally scheduled to begin on January 1st. The President’s Office has expressed support for moving the start date to 2029, but the National Assembly has not yet approved this change. For traders, the uncertainty is not limited to the tax rate. Current law sets a special initial cost base for tokens held before the tax collection begins, and a change in the start date would alter the dates used in this calculation.

• Although the latest proposal is to postpone it until 2029, the law currently stipulates that taxes will be imposed on eligible transfers and loans of crypto assets starting from January 1, 2027.
• Under the current framework, the portion of annual income exceeding 2.5 million Korean won is subject to a national income tax of 20% and a local income tax of 2%.
• For assets held before 2027, the initial acquisition value is the higher of the actual cost and the market value determined at the onset of taxation.
• The South Korean National Tax Service plans to release guidelines regarding activities such as staking, airdrops, forks, and decentralized finance in November.
• South Korea is expected to start international encrypted data exchange from 2027, while officials mentioned a later schedule for the United States during discussions about postponing this timeline.

Those who bought Bitcoin years ago may need to organize multiple exchange statements, wallet transfer records, and transaction fees. According to the currently published tax rules, this historical data does not necessarily represent the cost of the tokens held at the onset of taxation. The law will compare the initial acquisition cost with the market value specified at the time taxation began, and the higher of the two will be taken into account. As a result, this could significantly affect the profits upon subsequent sales.

The guidelines published by the South Korean National Tax Service still designate January 1, 2027, as the starting date. To change this to another date, approval from the National Assembly is required. Prior to that, any political statements regarding 2029 are merely prospects for legislation and not actual rules that taxpayers and exchanges need to follow when making records.

The start date is still subject to the discretion of legislators.

In 2020, South Korea passed regulations regarding income tax on virtual assets, with the initial plan to implement them in January 2022. Subsequently, legislators postponed the implementation to 2023, then to 2025, and finally to 2027. The latest statements from the presidential office supporting a further extension indicate that ruling party members have proposed moving the start date to 2029, and the government also expects to engage in consultations on this matter. The opposition parties also support the extension, although some of their members advocate for an even later date or even the abolition of the regulations altogether. All parties acknowledge that the difficulty in advancing the schedule does not mean that there has been consensus on the text of the amendments yet.

The tax plan announced by the government in August still retains the starting date of January 2027. Exchanges and officials continued to prepare for this until October. During a congressional audit, tax commissioners stated that detailed guidelines were being prepared for November. During the annual tax law review period, political decisions could still change these plans. Traders who assume that the postponement has already taken effect may make decisions based on non-existent laws; those who believe that a postponement is not possible also need to continue to monitor the legislative process.

A petition seeking to extend the deadline by two years reached a threshold of 50,000 signatures in September and has entered the congressional review process. Being submitted for review merely means that legislators have reason to consider the request; it does not equate to an amendment having been made to the Income Tax Law. Petitions, proposals from the ruling party, and opposition party plans are just different approaches in political debates. Only when the legislation is actually passed can traders regard the new date as a settled fact.

The tax to be levied applies to income generated from the transfer or lending of eligible virtual assets after the effective date. The Korean National Tax Service classifies it as other income subject to separate taxation. The tax rate specified in their guidelines is 20% for national tax, with a tax exemption of 2.5 million Korean won per year; the commonly mentioned 22% rate includes an additional 2% local income tax. If the law comes into effect as planned, the first annual tax filing for 2027 income will take place in May 2028. If the implementation is postponed, the first filing date will also be delayed accordingly, depending on the final amendments passed by the National Assembly.

Calculation only becomes simple once the earnings are determined. Suppose a trader has a net income of 5 million Korean won that meets the criteria for that year. After deducting a tax exemption of 2.5 million Korean won, the remaining 2.5 million won is subject to taxation. Calculated at a combined tax rate of 22%, the tax amount would be 550,000 Korean won. This example does not involve any particular DeFi reward, the taxpayer's total expenses, or the handling of losses in other years, and should not be misconstrued as implying a 22% tax on all income or account balance.

When the 2027 timeline was confirmed in August, it reflected the government's position before the discussions in October. The change in the official stance is in itself news, but legal procedures are very important: there is first a proposal, followed by committee review, congressional voting, and official announcement. Investors need the effective text to determine the effective date and any transition rules. Based solely on news reports, it is not possible to determine how old positions will be valued if legislators choose 2029.

Why the initial valuation may be more important than the tax rate

According to the guidelines from the National Tax Service, for virtual assets held before January 1, 2027, the value to be recognized is the higher of the actual acquisition cost and the market value specified at the end of the day prior to the commencement of taxation. Under the current implementation, the guidelines refer to the prices published on January 1, and for currencies covered by relevant domestic price reporting agencies, a designated average value is used. For other currencies, prices stipulated by another qualified institution are applied. These are legal and regulatory mechanisms, and traders do not have the option to choose the highest quotes from exchanges at their discretion.

Assume that a resident purchased 1 token for 10 million Korean won years ago, while its prescribed initial value was 30 million Korean won. If this person later sells it for 35 million Korean won, then the initial cost of this asset held before tax commencement should be 30 million Korean won, not 10 million Korean won, and subsequent allowable expenses and annual tax exemptions must also be deducted. The pre-tax appreciation is not included in the after-tax profit in this example. If the original cost was 40 million Korean won but the prescribed initial value was 30 million Korean won, then the higher original cost should be used. Both of the above examples assume that the current guidelines apply and that the transactions themselves meet the conditions; however, they do not constitute the final tax return results.

If the launch time is postponed, the assumed reference date will also change, but the specific impact depends on the content of the amendment. If Congress simply moves the effective date forward while retaining the same "higher of cost or market value" rule, then the starting value for 2029 will replace the reference value for 2027. If the transition provisions are revised, the outcome could be different. No one can know in advance what the future market prices will be. To automatically assume that a postponement is beneficial to all investors ignores those who hold positions that may decline in value, as well as those who may have sold their tokens before the final launch.

The valuation methods outlined in the guide imply that even if there is an initial upward adjustment, it is still important to keep records. Taxpayers need to prove what coins they hold at the boundary points, in what quantities, whether they are locked, what the actual cost of certain assets is, and which expenses can be claimed. A single screenshot of the total portfolio amount is far less reliable than detailed records of each transaction and disposition. A transfer between wallets may simply be recorded as an income by the receiving exchange, but it does not show when those coins were initially purchased.

The “take the higher one” rule has a more subtle meaning as well. It prevents the cost of buying at a higher price from being reduced by a lower starting market price. This is particularly important for those who bought at high points and held onto their assets until taxes came into effect. It also means that even if two taxpayers sell the same token at the same price, their taxable gains may differ because one of them had a higher original cost than the estimated value of the token. Even if the initial valuation seems lenient to many holders, it is still useful to keep historical evidence.

Average Cost Method follows the holder

According to the guidelines from the National Tax Service, the acquisition cost of the same type of virtual assets is calculated using an average method for each resident. In simple terms, holders will combine the relevant quantities and acquisition values of the same asset, rather than arbitrarily selecting a high-cost purchase to match when selling. The specific application still needs to follow the implementing regulations, but this principle means that the “profit” displayed on a single exchange is not sufficient to reflect the actual situation of trading the same token across multiple platforms.

For example, someone buys one unit for 10 million Korean won first, and then buys another identical unit for 20 million Korean won after taxes start. Before considering any fees or other adjustments, the simple average cost is 15 million Korean won per unit. If they later sell one unit for 25 million Korean won, it is generally not appropriate to designate that 20-million-won purchase as the sole cost just because it reduces the overall profit. The actual calculation may be affected by the position held before the initial purchase, subsequent transactions, and applicable rules; therefore, a ledger with dates is more reliable than simply remembering the most recent transaction.

Acquisition costs can include the purchase price and acquisition expenses. The guide also lists expenses related to disposal, such as selling fees. The method for calculating income is: the consideration received for the transfer or lending, minus the allowable deduction of acquisition costs and related expenses. The profits and losses reported by the exchange may not take into account network fees, transfers to other services, or tokens obtained outside of that exchange. Traders should be able to verify the units that flow out, the units that flow in, the value at relevant time points, and the expenses supported by records.

The materials from the National Tax Service also mention an exception: for assets that were purchased after the tax period began but for which the actual acquisition cost is difficult to verify, it may be permissible to estimate the necessary expenses at a specified ratio, with a limit of 50% of the sales revenue. However, in such cases, these expenses cannot be included as other indirect costs separately. The guidelines do not make this an optional general practice that can be used at any time to replace the recorded costs when it is advantageous. How to determine what constitutes "unverifiable" and what the final prescribed ratio is will need to be clarified in the guidelines before further examination.

Moving tokens from a domestic exchange to a private wallet does not generate new purchase receipts. However, this may cut off the exchange’s ability to track the original acquisition records. When returning to the exchange later on, the transaction may only be displayed as a deposit with no historical cost associated with it. Holders must maintain a complete chain of fund transfers by using the wallet address, transaction number, timestamp, and exchange records. If the tokens are exchanged for another type of asset after the effective date, such a transfer or exchange may also fall under taxable categories. The guidelines issued by the National Tax Service include both sales and exchanges in their description of such transfers.

Overseas transactions are a political sticking point.

Officials cited incomplete overseas transaction information as one of the reasons for considering a further extension. South Korea plans to start exchanging data with other jurisdictions participating in the OECD's Crypto Assets Reporting Framework starting from 2027, but the implementation timeline announced by the United States indicates that this will not occur until 2029. The President's Office is reportedly concerned that if South Korea begins taxing in 2027, some overseas transactions may require manual investigation by authorities, whereas domestic exchanges would be able to provide records more easily.

CARF is an information sharing framework, and it is not a rule that determines an individual's tax obligations. If a resident makes a taxable disposition in an overseas exchange and simply transfers their account abroad, this income does not escape Korean law. The government has previously made similar responses regarding private wallets and overseas exchanges. Cross-border taxation and verification are more difficult, which is another issue and is not the same as whether a transaction falls within the scope of legal application.

This disparity also involves fairness. Compliant domestic platforms may provide sufficient information to authorities for tax reporting; however, overseas platforms may provide the same data through automated channels at a later time. The uneven probability of enforcement could potentially reward activities that occur outside of visible systems, even though legal obligations are the same. Exchanges believe that both the reporting systems and definitions need time to be perfected. Investors who have retained complete overseas records may well question why the implementation time for everyone depends on when the United States joins the international exchange mechanism.

Whether it's 2027 or 2029, complete transparency cannot be guaranteed. The reporting framework can provide account and transaction data from covered service providers, but private-controlled wallets, decentralized activities, and differences between different jurisdictions still need to be explained. Regulators must match transactions with residents' identities, distinguish transfers and sales between the same person's accounts, and identify the prices and costs behind taxable dispositions. The arrival of more data can improve law enforcement, but it will not automatically generate an accurate cost basis for each wallet.

Therefore, the proposed extension should be viewed as an administrative and political choice, rather than an indication that the benefits of encryption cannot be measured. Congress may deem the current framework sufficient by 2027, or it may believe that it will be better to complete the reconciliation by 2029. Regardless of the timeline, the original records in the hands of investors will still be valuable. Delaying the reporting by two years will not re-create those exchange statements that have already been lost.

The November guidelines need to address thorny issues.

In October, tax officials informed members of parliament that the National Tax Service was preparing more detailed guidelines regarding staking, airdrops, hard forks, and decentralized finance. Reports on the proposed guidelines for November indicate that exchanges are concerned that these activities cannot be handled in the same way as simple buying and selling. As of October 27th, no final comprehensive treatment plan had been announced. Until the guidelines are released, it is not advisable to assume any timing or classification of taxable income on one's own.

Staking rewards may be credited to the account without a traditional purchase price. Airdrops may be deposited into the wallet without any active action on the recipient's part. A hard fork may result in a new asset for which there is no clear purchase invoice. The DeFi position may manifest as deposits, receipt tokens, loans, or transactions at different stages. The guidelines from the National Tax Service explicitly cover income from transfers and loans, but the specific cost basis and tax calculation timing for other activities are still under study by officials. Exchanges may display the market value, but this does not equate to a determination of its legal nature.

Assume that a wallet receives tokens as a result of participating in a network and then sells them later. The holder is interested in knowing the date of receipt, the quantity, the value at that time, and the final selling income. If guidelines consider the receipt of tokens to be a taxable event, then the subsequent cost basis may differ from the rule that taxes are only levied at the time of disposal. The relevant rules in the existing materials have not yet been finalized, therefore, no calculation should be regarded as an established answer. Keeping track of the two time points and prices will help to maintain flexibility until there is a clear explanation from the National Tax Service.

Cross-platform lending also presents similar accounting challenges. Users can send tokens to lending services, receive debt certificates in return for rewards, and then withdraw the funds later. If every transfer of tokens between wallets is considered a sale, it may overstate income; whereas ignoring the actual asset exchanges could lead to an underestimation of income. Service providers' financial reports may use their own definition of profit. Tax calculations require identifying the type of transactions and the complete history of the users involved, rather than simply copying the platform's annual summaries without verification.

Guidelines can improve the clarity of existing laws, but they cannot unilaterally change the start dates set by Congress. Exchanges are preparing their systems according to the current timeline and are also seeking answers from the government. If legislation delays the implementation, the guidelines may still reveal how regulatory authorities intend to handle complex activities once the rules finally take effect. If the law remains unchanged, the time for companies to adjust their reporting software will be very tight between the release in November and the launch in January.

Losses will not continue automatically like in a stock account.

Under the proposed system, annual crypto income will be consolidated for calculation, and a basic deduction of 2.5 million Korean won will apply. A part of the tax controversy focuses on whether losses incurred in one year can be carried forward to subsequent years. Legislators pointed out that the draft framework does not provide a universal loss carryforward mechanism like some other investment tax regimes. If someone incurs a loss in a later year, it does not mean they can get back the taxes paid in the previous year just because their overall trading account has declined over time.

Assume that someone achieves a net income of 10 million Korean won in one year that meets the criteria, and then experiences a net loss of 10 million Korean won in the following year. In the first year, taxes may be incurred due to exceeding the tax exemption amount, while the loss in the second year will not automatically result in a refund of the taxes paid in the first year. The actual outcome depends on the laws in effect at the time, the scope of deductions allowed each year, and the taxpayer's complete transaction history. This example is merely used to illustrate the points of contention and does not promise any specific tax conclusion.

This design can affect year-end behavior. Traders may need to clarify when assets are legally considered disposed of, as well as how annual gains and losses are consolidated. Transferring assets between wallets is not the same as selling them to others. Platform dashboards may show unrealized gains, but under simple transfer rules, this does not equate to income that has been fully realized. Records of events and timing are more important than snapshots of the market value of the portfolio at the end of the year.

Compared to stock taxes, this is a matter of both political and technical arguments. Opponents argue that the proposed crypto tax treats retail digital asset investors less favorably than some stock investors. Supporters believe that income should be taxed, and a better reporting system would reduce unfairness between domestic and overseas activities. Congress could choose a later start date, a higher tax exemption threshold, revised loss rules, or simply abolish the tax altogether, but each of these options requires actual legislation. Public support for a delay alone does not automatically determine the final outcome.

Records that should be retained until the vote is decided

The start date specified in the draft makes December a real planning period, rather than an abstract deadline. If taxes come into effect in January, then it is necessary to record how many tokens were held before that boundary, as well as how the starting price was determined. If legislators pass a postponement in late November or December, the boundary that needs to be captured immediately may change, but the transaction history itself will not lose its value. Some holders who purchased at prices higher than the future starting price during this period will still need this evidence. Others may have partially sold their positions, thereby changing the quantity to which the final rules apply.

The record of a transaction should include both the platform's transaction report and the settlement and transfer records as much as possible. Limit orders may be executed in multiple instances, with varying prices and fees. When exporting an account, the information may be displayed in the currency chosen by the exchange, but for Korean tax calculations, it needs to be converted into Korean won according to applicable rules. Converting through stablecoins may add several additional steps between the initial purchase and the final withdrawal. If intermediate transactions are overlooked because the trader does not return to their bank account, the records will be incomplete, which is precisely the situation of transfer described by the National Tax Service.

Wallet activities can be difficult to interpret even with just a public blockchain browser. Addresses merely indicate the destination of funds and do not necessarily represent the owner or the purpose of the transfer. Transferring funds to another wallet controlled by the same person may simply be for bookkeeping purposes, while transferring them to someone else could have economic consequences. Recording the transaction counterparties and address control situations helps to explain the trajectory of the transactions on the blockchain. Even though transactions are publicly visible on the blockchain, it does not mean that tax authorities can reconstruct the original purchase cost of the assets solely based on the information on the blockchain.

People who use multiple exchanges may notice inconsistencies when merging download records. One report might use a timestamp with the format UTC, while another uses Korean Standard Time; transactions close to midnight may fall on different dates after conversion. Fee items may appear as separate transactions, and the quantity of units recorded may also differ from the total order size. Conducting a reconciliation before the reporting deadline helps to identify these discrepancies when account access and records are still available, and it also makes it easier to explain unusual cost figures, especially when the information provided by the exchanges to the National Tax Service later on is incomplete.

The guidelines to be released soon may define some details, especially regarding rewards and the handling of DeFi. Saving records at this time does not mean that every incoming payment is already taxable. It merely allows investors to distinguish between actual receipts and what is displayed on the protocol interface, to determine whether a certain asset can be sold, and to calculate subsequent transfers when required by the rules. Regardless of the final political outcome, clear documentation is very useful. It leaves the decision on whether to levy taxes to the law and the facts, rather than leaving it to gaps in the transaction history.

A useful transaction document should start with the date, quantity, asset name, and the Korean won price at the time of purchase or sale, and should include the transaction and transfer fees. It should also match the exchange statement with the wallet transaction numbers, and record transfers between accounts under the same person's name. Loan agreements and reward notifications should also be retained, as they may require additional information for tax purposes under future guidelines. This is merely a description of the data required by the published cost-based rules and does not constitute individual tax advice.

The snapshot before the tax deadline is particularly noteworthy. According to the current guidelines from the National Tax Service, holders need to know the quantity they possess as of December 31, 2026, as well as the applicable market value at the end of the year. If legislators adjust the tax date, the final starting snapshot may also be postponed. Keeping historical records during this period is still helpful for proving the higher original cost and verifying the remaining number of units. Saving the exchange export files now is much easier than trying to reconstruct them from memory later on, when the platform interface has changed.

A large number of transactions may require more than just piecing together screenshots into a spreadsheet. Multiple exchanges may use different time zones and token codes. Transfers between wallets can incur network fees based on the value of the assets being transferred. Splitting, forking, or token migrations can also complicate the identification of units. The correct calculations depend on the final legal guidelines, but clean original records allow holders or accountants to recalculate once the rules are clear. The reliability of tax reports generated by software depends solely on the transactions that are imported and categorized.

If the extension is ultimately approved, traders should read the transition provisions rather than assuming that today's starting costs will be automatically extended for two years. If the extension is not approved, the current 2027 legislation and the guidelines issued by the National Tax Service in November will immediately become important. The next decisive document will either be an already effective amendment or there will be no amendment by the end of the year. Until then, a more prudent assessment is that the extension is still under discussion, and the current legal provisions still refer to January 1st.

Matters of note

• Congressional Text: To check whether legislators have indeed approved a new effective date, as well as whether they have rewritten the rules regarding the cost base before the tax period begins.
• National Taxation Administration Guidance: Pay attention to the handling methods for pledges, airdrops, forks, loans, and DeFi transactions that are scheduled to be released in November.
• Starting price method: Retain the original purchase records, as well as the specified price and quantity at the beginning of the final taxation.
• Overseas Declaration: Comparing the timeline of South Korea's CARF implementation with that of the United States, as well as the coverage of private wallet transactions.
• First filing date: Under current laws, taxable income for 2027 is typically due to be filed in May 2028; if the law is extended, the schedule may change.

Frequently Asked Questions

Has South Korea postponed its tax payments until 2029?

No. Although the presidential office is said to support a postponement, and members of parliament have proposed relevant solutions, as of October 27th, the legal commencement date remains January 1, 2027.

What is the planned tax rate?

According to the guidelines from the National Tax Service, for those who meet the criteria and have annual income exceeding 2.5 million Korean won, a national tax rate of 20% applies. Adding 2% local income tax, the commonly referred to consolidated tax rate in the market is 22%.

Are existing tokens taxed on all profits since the time of purchase?

According to the rules published before 2027, the value obtained is the higher of the actual cost and the prescribed initial market value. The result depends on the specific asset and records.

How to calculate the cost of multiple purchases?

The National Tax Service adopts a total average method based on residents for the same virtual assets. The profit and loss statement of a single account on an exchange may overlook other purchases.

Is selling on overseas exchanges not subject to legal constraints?

No. The location of the exchange or the use of a private wallet does not determine independently whether a resident's eligible income is taxable.

What about staking and airdrops?

The National Tax Service stated that they are preparing detailed guidelines for November. The general rules that have been announced do not address the timing and cost basis for each type of incentive.

When is the deadline for filing my first tax return?

If the starting point in January 2027 remains unchanged, residents with relevant taxable income will typically file their 2027 annual income tax return in May 2028.

If tax payments are postponed, should traders discard their old buy records?

Should not. According to the 'higher of' rule, the original cost may still be important; moreover, if the start date changes, formal transition provisions are also required. This is an educational analysis and does not constitute investment advice.