1. Check Whether You Must File
This guide states that you must file if annual gains from selling coins exceed KRW 2.5 million.
2. Download Transaction Records
- Upbit app or website → My Page.
- Transaction History → Set the period (January 1–December 31).
- Download all transaction records as CSV or Excel.
3. Calculation Method
📊 Moving Average Method
Capital gain = Sale price − Acquisition cost (moving average)
First purchase: 1 BTC at KRW 70,000,000
Second purchase: 1 BTC at KRW 80,000,000
Moving average acquisition cost: (70M + 80M) / 2 = KRW 75,000,000
Sale: 1 BTC at KRW 90,000,000
Gain: 90M − 75M = KRW 15,000,000
4. Filing Through Hometax
- Visit Hometax during the May comprehensive income tax filing period.
- Select Other Income → Virtual Asset Capital Gains.
- Enter the calculated capital gain.
- Apply the KRW 2.5 million deduction, followed by the 22% tax rate described in this guide.