The price of Tether (USDT) in Korean won is not determined by the USD/KRW exchange rate alone. Because it also reflects USDT’s own market price in dollars and the price difference in domestic KRW markets, even if the dollar exchange rate rises, a narrowing domestic premium can result in a loss in won terms.
Rather than answering “How much is Tether right now?”, this article answers “How much Korean won do you actually have left after buying and selling the same amount of USDT?” Check current data in the Coinpop Kimchi Premium and Market Sentiment tools (Korean-language tool), then adjust the assumptions in the calculations below to examine the effects of the exchange rate, premium, and fees separately.
Written and verified by: Hyun Lee · Official sources checked: November 2, 2026. The prices and 0.1% fee rate below are illustrative assumptions, not current market prices or the fees charged by any specific exchange. This is not investment advice or a prediction of returns.
1. Can you lose money even if the exchange rate rises 1%? Nine net profit and loss scenarios for 1,000 USDT
If the premium paid when buying disappears, a small rise in the exchange rate can be offset. To illustrate this, the purchase conditions were held constant, and only the exchange rate and domestic premium at the time of sale were changed.
Common assumptions
- Purchase amount: 1,000 USDT; reference USD/KRW exchange rate at purchase: KRW 1,400/USD; USDT price in dollars: 1 USD/USDT.
- The assumed domestic premium at purchase is 2%, so the assumed average purchase execution price is KRW 1,428/USDT.
- The buy and sell fees are 0.1% of the transaction amount, respectively. The buy fee is paid separately in won, while the sell fee is deducted from the proceeds in won.
- All 1,000 USDT purchased are sold on the same domestic KRW market. No assets are transferred, and the USDT price in dollars is fixed at 1 at the time of sale.
- Prices are assumed average execution prices for illustrative purposes. Additional slippage, withdrawal/network costs, bank fees, taxes, interest during the holding period, and opportunity costs are not included.
Therefore, the amount of Korean won required upfront is KRW 1,429,428. The proceeds below are after deducting the sell fee, and net profit or loss is calculated against this initial outlay.
| Exchange rate change / exchange rate at sale | Premium at sale | Assumed selling price (KRW/USDT) | Proceeds after fees | Net profit/loss / return |
|---|---|---|---|---|
| -1.00% / KRW 1,386 | 0.00% | KRW 1,386.00 | KRW 1,384,614 | -KRW 44,814 (-3.14%) |
| -1.00% / KRW 1,386 | +1.00% | KRW 1,399.86 | KRW 1,398,460 | -KRW 30,968 (-2.17%) |
| -1.00% / KRW 1,386 | +2.00% | KRW 1,413.72 | KRW 1,412,306 | -KRW 17,122 (-1.20%) |
| 0.00% / KRW 1,400 | 0.00% | KRW 1,400.00 | KRW 1,398,600 | -KRW 30,828 (-2.16%) |
| 0.00% / KRW 1,400 | +1.00% | KRW 1,414.00 | KRW 1,412,586 | -KRW 16,842 (-1.18%) |
| 0.00% / KRW 1,400 | +2.00% | 1,428.00 KRW | 1,426,572 KRW | -2,856 KRW ( -0.20%) |
| +1.00% / 1,414 KRW | 0.00% | 1,414.00 KRW | 1,412,586 KRW | -16,842 KRW ( -1.18%) |
| +1.00% / 1,414 KRW | +1.00% | 1,428.14 KRW | 1,426,712 KRW | -2,716 KRW ( -0.19%) |
| +1.00% / 1,414 KRW | +2.00% | 1,442.28 KRW | 1,440,838 KRW | +11,410 KRW ( +0.80%) |
Source: Coinpop hypothetical inputs and calculations, verified on November 2, 2026. Amounts are rounded to the nearest won, and prices and returns to two decimal places. Intermediate calculation values were not rounded, so multiplying the displayed figures again may result in a difference in the last digit. On mobile, swipe horizontally within the table to read it.
Even if the exchange rate rises from 1,400 KRW to 1,414 KRW by 1%, if the selling premium is 0%, there is a 16,842 KRW loss (about −1.18%). Conversely, assuming the exchange rate rises by 1% and the premium remains at 2%, the result is a profit of about 11,410 KRW. Even with the same exchange-rate change, the outcome depends on whether the domestic price difference persists.
A loss of 2,856 KRW remains even in the row where both the exchange rate and premium are unchanged. This is due to the two transaction fees, for buying and selling. This table compares the conditions under which a loss or profit occurs; it does not indicate the probability that any of these conditions will actually occur.
2. Three factors that determine the KRW price of Tether
Separating USDT’s dollar market price, the USD/KRW exchange rate, and the domestic price difference makes it easier to answer the question, “Why is it different from the dollar price?” The formula below summarizes the price relationship among the selected data sources. It does not explain every factor that determines the price or establish an objective fair price.
USDT price in KRW = USDT market price in USD × reference USD/KRW exchange rate × (1 + domestic price difference rate)
For example, if the USDT price in dollars is set to 1 and the USD/KRW exchange rate to 1,400 KRW, the benchmark value for comparison is 1,400 KRW/USDT. If the domestic price is 1,428 KRW, it is 2% above that benchmark. This article refers to this as the domestic premium.
Domestic price difference rate (%) = [Domestic USDT price in KRW ÷ (USDT market price in USD × reference USD/KRW exchange rate) − 1] × 100
Calculations that always fix the USDT price in dollars at 1 may produce different results from calculations using the actual dollar market price. Also, when calculating the price difference between BTC markets in Korea and abroad, using overseas BTC/USDT prices and domestic USDT/KRW prices is based on a different benchmark from using an independent dollar exchange rate. When comparing kimchi premium figures from different sites, first check what they use as the denominator.
Domestic prices in KRW may diverge from the dollar-based benchmark depending on orders and liquidity on the exchange, asset transfer conditions, and other factors. USDT’s issuance structure, reserves, and redemption rights are discussed separately in Differences Between USDT and USDC, so this section focuses on calculating profit and loss in KRW.
3. Formula for calculating the amount paid and received
Profit and loss in KRW is calculated by subtracting total KRW outlay from the final KRW proceeds, not by looking at the exchange-rate difference. Here is the detailed calculation for one row in the example above, with the quantity held constant, where the exchange rate rises by 1% and the premium disappears.
| Item | Calculation | Amount in KRW |
|---|---|---|
| Purchase transaction amount | 1,000 × 1,428 | 1,428,000 KRW |
| Purchase fee | 1,428,000 × 0.001 | 1,428 KRW |
| Total outlay | 1,428,000 + 1,428 | 1,429,428 KRW |
| Sale transaction amount | 1,000 × 1,414 | 1,414,000 KRW |
| Selling fee | 1,414,000 × 0.001 | 1,414 won |
| Proceeds / net profit or loss | 1,414,000 − 1,414 / proceeds − total outlay | 1,412,586 won / −16,842 won |
Assuming the entire quantity is sold and fees are charged in KRW, let Q be the quantity purchased, B the average buy execution price, S the average sell execution price, and fb and fs the buy and sell fee rates, respectively. 0.1% is entered as 0.001 in the calculation.
Total outlay = Q × B × (1 + fb)
Proceeds = Q × S × (1 − fs)
Net profit or loss = proceeds − total outlay
Return (%) = net profit or loss ÷ total outlay × 100
If paying fees in USDT reduces the quantity held, use the actual remaining balance as the quantity sold. Buying with a fixed KRW budget is also different. If the buy fee is included in the budget and paid in KRW, first calculate the quantity acquired as budget ÷ [average buy execution price × (1 + buy fee rate)]. Mixing a fixed-quantity example with a fixed-budget example will lead to an incorrect cost comparison.
For a route involving a withdrawal or transfer, the quantity or asset received may differ. In that case, account for not only trading fees but also the actual withdrawal cost, the cost of converting again at the destination, and any remaining balance in the cash flow. Be careful not to subtract a cost again if it has already been reflected in the deposited balance.
4. What selling price would break even?
Under these assumptions, the break-even selling price is approximately 1,430.86 KRW/USDT. It is higher than the starting average execution price of 1,428 KRW because the round-trip fees must be recovered.
Break-even average selling price = total outlay ÷ [actual quantity sold × (1 − sell fee rate)]
Example above: 1,429,428 ÷ (1,000 × 0.999) = approximately 1,430.858859 KRW/USDT
To convert this to a dollar exchange rate, additional assumptions are needed about the USDT dollar price and domestic premium at the time of sale. The results below assume a fixed USDT dollar price of 1.
| Assumed selling premium | Required USD/KRW | Compared with buy exchange rate of 1,400 KRW |
|---|---|---|
| 0.00% | 1,430.86 KRW/USD | +2.20% |
| +1.00% | 1,416.69 KRW/USD | +1.19% |
| +2.00% | 1,402.80 KRW/USD | +0.20% |
Required exchange rate = break-even average selling price ÷ [USDT dollar price × (1 + selling premium)]. Source: the common assumptions above and calculations by Coinpop. The figure to two decimal places is rounded from the mathematical result and does not guarantee a quote that can be ordered at an exchange or an actual execution.
If the premium is 0%, the exchange rate needs to rise by approximately 2.20% for the calculation to break even; if a 2% premium is maintained, the required increase is approximately 0.20%. This is not an exchange-rate forecast or target price. It is a threshold showing how the conclusion changes when input conditions change.
5. Conditions to align before comparing actual prices
Prices can be interpreted as cost differences only when the time, unit, and trade direction are aligned. The last traded price, a bank's reference exchange rate, and an executable order-book quote are different kinds of data.
- Currency and trading pair: Check whether the market trades USDT for KRW, as in USDT/KRW, or trades it for dollars, as in USDT/USD. Since exchanges may display pairs in different orders, also check the price unit. Do not treat the USDT in BTC/USDT as equivalent to dollars.
- Reference time: Check whether the previous business day's exchange rate has been applied to the USDT price, which trades 24 hours a day. Record the time difference, especially on weekends or when Korean and overseas markets have different closures.
- Actual order direction and quantity: When buying, check the ask price and quantity; when selling, check the bid price and quantity. If an order consumes multiple price levels, use the average execution price rather than the best quote.
- Fees and remaining balance: Check the applicable fee rate for each account and trading pair, the asset from which the fee is deducted, and the quantity received. Do not use 0.1% from this article as your own actual fee rate.
- Final KRW cash flow: Recalculate the outlay and proceeds from the execution and fee records. Distinguish between unrealized profit or loss based on the current price and realized profit or loss after an actual sale.
Upbit's official order-book documentation covers order quantities for both buys and sells, as well as prices. This is why you should not assume that the entire desired quantity will execute based on a single price shown on screen.
Exchange-rate data should also be checked for its intended use. For example, the ECB's reference exchange rate guidance states that the rates are for information purposes and are not recommended for transaction purposes. Since the ECB table is based on EUR, the currency values for the same date must be cross-converted correctly to use it as USD/KRW. The 1,400 KRW in this article is an illustrative input, not an observed value taken from that table.
6. 1 USDT's dollar benchmark and the amount I recover in KRW are different
Conditions for direct redemption with the issuer do not guarantee a selling price on a domestic exchange. Tether imposes conditions on direct redemption, including verified accounts and a minimum amount; the minimum redemption amount in the official guidance reviewed is equivalent to 100,000 USD. This is not the same rule as the minimum order amount for trading small quantities of USDT on a domestic exchange. Check Tether's official redemption guidance and official fee schedule separately.
Tether's terms also distinguish tokens from fiat currency and set separate eligibility requirements and costs for direct issuance and redemption. Therefore, “pegged to the dollar” should not be taken to mean that anyone can exchange USDT for dollars or KRW at any time without fees. Issuer, exchange, custody, and transfer risks are not eliminated by price calculations alone.
This article does not combine different risks into a single safety score. Reserves and redemption rights are covered in the existing USDT–USDC comparison article; actual price differences can be checked with the Kimchi Premium tool; and the calculation in this article can be used to compare your own KRW outlay and proceeds. Each has a distinct purpose.
Frequently Asked Questions
If Tether is 1 dollar, shouldn't its price in KRW match the dollar exchange rate?
The design benchmark of 1 dollar and the price actually executed on an exchange are different. Check the USDT dollar market price, the KRW–USD exchange rate, the domestic price difference, and trading costs separately.
Does a negative Tether Kimchi Premium always mean a profit?
No. The premium may not recover, the exchange rate or USDT dollar price may fall, and fees and bid-ask spreads still apply. A negative figure alone does not guarantee an executable selling price or a profit.
The fee of 0.1% in the table above is the actual rate for which exchange?
It is an assumption for illustrating the effect of costs, not the rate of a specific exchange. For an actual calculation, use the rate applicable to the trading pair and account you intend to use, and specify the asset from which the fee is deducted.
How does the calculation change if the USDT dollar price falls below 1?
Enter the actual value as the USDT dollar market price in the KRW price formula. For example, keeping the other conditions the same as in the loss example above and changing only the dollar price at the time of sale to 0.999 reduces the proceeds to approximately 1,411,173 KRW. This is also an illustrative assumption, not a prediction of whether a depeg will occur or how large it would be.
Sources and calculation basis
The official explanations are based on Tether's redemption guidance, fee schedule, and terms; Upbit's order-book documentation; and the ECB's reference exchange rate guidance, reviewed on November 2, 2026. The price relationships, the table of nine net profit-or-loss outcomes, and the break-even point are analyses calculated by Coinpop using hypothetical inputs; they are not returns announced by an official institution or actual trading results.
If the table's input conditions change, the results must be recalculated. Before using the relevant service, check its current eligibility requirements, rates, market, and reference time. The purpose of the calculation is not to recommend buying or selling assets, but to help explain how the same price movement can result in different KRW profits or losses under different costs and conditions.
