You don't need to time the market or understand elliptic curves to own a little bitcoin. Buying your first bitcoin step by step means opening a verified account on a regulated exchange, funding it in yen, placing a small order, and moving the coins into your own custody when you're ready. In Japan, that path usually runs through a licensed domestic exchange like bitFlyer, which handles yen deposits and the mandatory identity checks. Here's the whole sequence, plus the mistakes that trip up most first-timers.
Step 1: Pick a licensed exchange and get verified
Japan regulates crypto exchanges under the Payment Services Act, so your first decision is really about which licensed operator to use. bitFlyer is one of the longer-established domestic options and offers yen funding directly. Signing up takes minutes; verification takes longer.
What you'll actually need
You'll photograph your My Number card or residence card, take a selfie, and possibly confirm a utility bill. If you're a foreign resident, make sure your name matches across every document. A mismatched middle name is the single most common reason verification stalls for days.
Expect approval to take anywhere from a few hours to a couple of business days. Don't fund the account before you're verified; the deposit will just sit there unusable.
Step 2: Fund the account with yen
Domestic bank transfer is the standard route. From your bank's app, transfer the amount you intend to spend to the deposit account the exchange gives you. Start small on purpose.
Here's a scenario worth copying. Say you set aside ¥10,000. You transfer exactly that, buy bitcoin with the whole amount minus fees, and accept that the position might drop to ¥8,000 next week. That's not failure. That's tuition for learning how the interface, the order book, and your own nerves behave.
Watch the fee structure before you commit
bitFlyer and its peers typically charge a trading commission that varies by product and volume, and some funding methods carry their own costs. Check the current fee page rather than trusting a blog post, including this one. For a ¥10,000 purchase the absolute fee will be small, but knowing the number builds the habit of reading costs before clicking.
Step 3: Place the order (and understand what you're clicking)
Two order types cover almost everything a beginner needs.
- Market order — buys immediately at whatever the best available price is. Simple, fast, slightly unpredictable on price.
- Limit order — you name your price and wait. Better control, but the order may never fill.
For a first purchase, a market order on a small amount is fine. The spread on a major pair like BTC/JPY is usually tight enough that a ¥10,000 buy won't be meaningfully hurt. What you should avoid is market-buying during a violent price swing, when the book thins out and your fill can land further from the quoted price than you expected.
A quick comparison
| Order type | Speed | Price certainty | Best for |
|---|---|---|---|
| Market | Immediate | Low | Small first buys |
| Limit | Whenever it fills | High | Buying at a target price |
Step 4: Decide where the bitcoin lives
Coins on an exchange are held in the exchange's custody. That's convenient and, on a licensed Japanese platform, subject to domestic rules on segregating customer assets. It's still not the same as holding your own keys.
When to move to self-custody
There's no universal threshold, but a common rule of thumb is to leave only what you'd be comfortable trading on the exchange and move the rest to a hardware wallet once the amount matters to you. A ¥10,000 experiment can stay put. A position you'd genuinely miss if the exchange had problems probably shouldn't.
Self-custody means safeguarding a seed phrase. Write it on paper. Never photograph it, never type it into a website, never store it in cloud notes. One leaked phrase and the coins are gone with no recourse.
Frequently asked questions
How much should I spend on my first bitcoin purchase?
An amount small enough that a 30% drop wouldn't change your life or your sleep. For many people in Japan that's somewhere in the low tens of thousands of yen. The point of the first buy is to learn the mechanics, not to make a return. You can scale up once the process feels boring.
Do I have to pay tax on bitcoin in Japan?
Yes, gains are generally taxable, and the treatment depends on your circumstances. Keep records of every purchase, sale, and fee from day one, because reconstructing them later is miserable. Consult a tax professional for your specific situation rather than relying on forum posts.
Can I buy fractions of a bitcoin?
Absolutely. You don't need to buy a whole coin. Orders are denominated in yen, and the exchange handles the fractional accounting. A ¥10,000 order simply buys the corresponding slice of one BTC at the current price.
What's the biggest mistake first-time buyers make?
Buying more than they can hold through a drawdown, then panic-selling at a loss. The second most common is skipping verification details and losing days to a stalled account. Both are avoidable with a small first order and tidy documents.
Set a calendar reminder for one week from now to check your order history and confirm the fees you actually paid. That single habit separates people who learn from people who guess.