What is the Bitcoin halving?
Written by an ex-institutional trader. What the Bitcoin halving is, how the block reward is cut in half roughly every four years (shown with a diagram), the full schedule, why it matters for supply and price, and the honest caveats.
Direct answer
The Bitcoin halving is a scheduled event, roughly every four years, where the reward paid to miners for adding a new block is cut in half. It is how Bitcoin slows the creation of new coins over time, building in a predictable, shrinking supply until the cap of 21 million is reached around the year 2140. The reward started at 50 BTC per block in 2009 and, after four halvings, sits at 3.125 BTC since April 2024.
The halving matters because it cuts the flow of new Bitcoin in half overnight, and historically the largest price cycles have followed in the year or so after each one. That pattern is widely watched but not guaranteed, and past cycles are not a promise about future ones. The halving is fixed in Bitcoin's code, so it happens automatically and on schedule, with no committee or company able to change it.
What the halving is
The Bitcoin halving is a scheduled event, roughly every four years, where the reward paid to miners for adding a new block of transactions is cut in half. It is the mechanism that slows the creation of new Bitcoin over time, building in a predictable and shrinking supply until the hard cap of 21 million coins is reached around the year 2140.
This is one of Bitcoin's defining features. Unlike regular money, which a central bank can print more of, Bitcoin's issuance is fixed in code and automatically tightened at each halving. No company, government or committee can change it.
Disclosure: SatoshiMacro may earn a commission if you sign up to an exchange through links on this page, at no extra cost to you. See our full affiliate disclosure.
How it works
New Bitcoin is created as a reward to miners who add each block to the blockchain. Every 210,000 blocks, which takes about four years at Bitcoin's average of one block every ten minutes, that reward is cut in half. The diagram shows the step-down: 50 BTC at launch, then 25, 12.5, 6.25, and 3.125 BTC since April 2024.
After each halving the network adjusts its difficulty so blocks keep arriving about every ten minutes, regardless of how many miners remain.
The halving schedule
| Halving | Year | Block reward (BTC) |
|---|---|---|
| Launch | 2009 | 50 |
| First | 2012 | 25 |
| Second | 2016 | 12.5 |
| Third | 2020 | 6.25 |
| Fourth | 2024 | 3.125 |
| Fifth (expected) | ~2028 | 1.5625 |
The pattern continues every four years until the last fraction of a coin is mined around 2140.
Why it matters
The halving matters because it cuts the flow of new Bitcoin in half overnight, while demand may stay the same or grow. In simple supply-and-demand terms, less new supply against steady or rising demand can support a higher price. Historically, the largest Bitcoin bull markets have arrived in the year or so after each halving, which is why the event is so closely watched.
It is also a regular stress test for the mining industry: a halving instantly halves miners' block-reward income, pushing out high-cost operations and leaving the efficient ones. This dynamic is one of the inputs behind cycle indicators like those in the SatoshiMacro Model.
The honest caveats
The halving is genuinely important, but it is easy to over-read:
- A small sample. There have only been a handful of halvings, so any "halving always leads to X" claim rests on very few data points.
- No guarantee. The price does not have to rise after a halving, and deep drawdowns have happened within those cycles. Many other forces, including macro conditions, regulation and sentiment, drive the price.
- Already known. The halving is fully predictable and public, so markets may price in some of its effect in advance rather than waiting for the day itself.
Treat the halving as one important input among many, not a guaranteed signal. If you want exposure to Bitcoin, buy it on a reputable AUSTRAC-registered exchange, and remember that selling is a taxable event in Australia.
Popular Australian crypto exchanges
All three are AUSTRAC-registered Australian exchanges. Crypto is volatile; only invest what you can afford to lose.
This is general information, not financial advice. Last reviewed: 2026-06-02.
Test your knowledge
A quick 3-question check on the key ideas above. Choose an answer for each, then check your score. Every answer is explained, and nothing is sent anywhere; it all runs in your browser.
Frequently asked questions
What is the Bitcoin halving in simple terms?
The Bitcoin halving is a built-in event, about every four years, where the reward miners get for adding a new block of transactions is cut in half. It is how Bitcoin gradually slows the creation of new coins. The reward began at 50 BTC per block in 2009 and has halved four times since, to 3.125 BTC as of April 2024. Because the rule is written into Bitcoin's code, the halving happens automatically and no one can change it.
When is the next Bitcoin halving?
Halvings happen roughly every four years, or more precisely every 210,000 blocks, which takes about four years at Bitcoin's average block time. The most recent halving was in April 2024, which brought the reward to 3.125 BTC. Based on the block schedule, the next halving is expected around 2028, when the reward will drop to 1.5625 BTC. The exact date is not fixed because it depends on how fast blocks are mined.
Why does the Bitcoin halving matter?
It matters because it cuts the supply of new Bitcoin entering the market in half overnight, while demand may stay the same or grow. In simple supply-and-demand terms, less new supply against steady demand can support a higher price. Historically the biggest Bitcoin bull markets have come in the year or so after each halving. That pattern is closely watched, but it is a tendency from a small number of past cycles, not a guarantee about the future.
Does the Bitcoin price always go up after a halving?
No. While the largest historical rallies have followed halvings, there is no rule that the price must rise, and there have been long, deep drawdowns within those cycles too. There are only a handful of halvings to learn from, so drawing firm conclusions is risky, and many other factors drive the price, including macro conditions, regulation and sentiment. Treat the halving as one input among many, not a guaranteed signal, and never invest money you cannot afford to lose.
What happens when all Bitcoin is mined?
Bitcoin has a hard cap of 21 million coins, and the halving schedule means the last new coin will be mined around the year 2140. After that, no new Bitcoin will be created, and miners will be paid entirely from transaction fees rather than block rewards. Well over 19 million have already been mined, so the remaining supply trickles out slowly over the next century under the halving schedule.
How does the halving affect miners?
A halving immediately cuts miners' block-reward income in half, so it squeezes their margins. Less efficient miners with high electricity costs can become unprofitable and shut down, while efficient operations survive. Over time the network adjusts its difficulty so blocks keep arriving about every ten minutes regardless of how many miners remain. The halving is therefore a regular stress test for the mining industry as much as an event for investors.
