A Bitcoin halving is the protocol-scheduled reduction in the new bitcoin included in each valid block. The subsidy halves every 210,000 blocks, roughly once every four years. The event changes issuance and miner revenue, but it does not program the market price.
Bitcoin halving dates and subsidies
| Event | Block height | Approximate date | Subsidy after the event |
|---|---|---|---|
| Launch | 0 | January 3, 2009 | 50 BTC |
| First halving | 210,000 | November 28, 2012 | 25 BTC |
| Second halving | 420,000 | July 9, 2016 | 12.5 BTC |
| Third halving | 630,000 | May 11, 2020 | 6.25 BTC |
| Fourth halving | 840,000 | April 20, 2024 UTC | 3.125 BTC |
| Next scheduled halving | 1,050,000 | Expected around 2028 | 1.5625 BTC |
The next date cannot be fixed years in advance because blocks do not arrive at perfectly uniform intervals. Block height 1,050,000 is the protocol milestone; any calendar date is an estimate.
What changed in 2024?
At block 840,000 the subsidy fell from 6.25 BTC to 3.125 BTC. That reduced the flow of newly issued bitcoin per block by half. Transactions continued to be processed, while miners earned a combination of the smaller subsidy and transaction fees.
The observable protocol effect is precise. The investment effect is not. Prices before and after April 2024 also reflected demand, liquidity, interest rates, regulation, exchange-traded product flows and broader risk sentiment. A chart that rises after a prior halving does not establish that the halving alone caused the move or that the pattern must repeat.
Why miner economics matter
A miner's revenue depends on the block subsidy, transaction fees, bitcoin's market price and the miner's share of successful blocks. Costs include electricity, equipment, facilities, financing and operations. When the subsidy falls, a miner may remain viable if price, fees or efficiency compensate; otherwise it may reduce activity or exit.
Bitcoin's difficulty mechanism adjusts periodically based on observed block production. This helps the network move back toward its target block interval when total computing power changes. It does not guarantee a particular miner's profitability or eliminate short-term variation in block times.
Public-company miners also add business risks that are separate from Bitcoin itself: debt, equity dilution, equipment purchases, power contracts, management decisions and custody. Owning a mining share is not the same exposure as owning bitcoin.
Does halving make Bitcoin scarce?
The schedule makes new issuance more predictable and progressively smaller. Bitcoin's rules target a maximum supply of about 21 million units, with transaction fees expected to become a larger part of miner compensation as subsidies decline. Scarcity alone does not determine price. Market value still requires demand, usable liquidity and willing buyers.
What comes next
If current consensus rules remain in place, the subsidy is scheduled to fall to 1.5625 BTC at block 1,050,000. The questions worth monitoring are measurable rather than predictive:
- the estimated date based on current block height and recent intervals;
- transaction-fee share of total miner revenue;
- total network hash rate and subsequent difficulty adjustments;
- miner disclosures about energy cost, liquidity and financing;
- market liquidity and custody risk;
- any proposed consensus change and its actual adoption, not merely discussion.
Risk checklist
Do not buy solely because a countdown claims supply will become scarce. Verify the block height, distinguish protocol facts from price forecasts, and decide how much loss you can tolerate. Crypto venues, wallets and products can add theft, fraud, leverage, liquidity and regulatory risks. A halving does not protect an account from any of them.
Bottom line
The 2024 halving reduced Bitcoin's subsidy to 3.125 BTC per block. The next reduction is tied to block 1,050,000, probably around 2028, but its exact date and price impact are unknown. Treat the issuance schedule as a protocol fact and every return forecast as an uncertain market claim.
