What is Bitcoin halving
A Bitcoin halving is a scheduled event in the Bitcoin code that cuts the number of new bitcoins paid to miners for each new block by half.
Miners are the computers that bundle transactions into blocks. The protocol pays them for each block with newly created bitcoin (the block subsidy) plus the transaction fees users attach. The halving reduces only the subsidy. Fees are not affected.
Formal definition
The block subsidy is set by block height, which is the position of a block in the blockchain. After every fixed interval of blocks written into the consensus rules, the subsidy is halved. No company, vote or central bank decides it. Every node running the standard software applies the same rule.
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Worked example (hypothetical)
Suppose the subsidy is X bitcoin per block before a halving.
| Before halving | After halving | |
|---|---|---|
| New bitcoin per block | X | half of X |
| Transaction fees per block | whatever users pay | whatever users pay |
| Miner's total income per block | X plus fees | half of X plus fees |
If the bitcoin price stays the same, a miner's income from the subsidy falls by half overnight. Costs such as electricity and equipment do not fall. This is why miners with higher costs may switch off machines after a halving.
Bitcoin halving date
A halving has no fixed calendar date. It happens when the network reaches a set block height. Blocks arrive at an average pace that the protocol keeps stable through a difficulty adjustment, but actual block times vary. As a result, the date can only be estimated. Block explorers and crypto news sites show countdowns based on the current block height, and the estimate shifts as blocks come faster or slower.
Halving effect on price
A halving reduces how fast new bitcoin enters circulation. It does not change demand. Price depends on demand, liquidity, interest rates, regulation and general market mood. All of these work together.
Points experienced traders keep in mind:
- The halving is known years in advance, so part of any expected effect may already be in the price. See buy the rumour, sell the fact.
- Past price moves after halvings are a small sample and do not predict future moves.
- Volatility around the event can be high in both directions.
Edge cases
- The subsidy is counted in satoshis, the smallest unit of bitcoin. Repeated halving eventually rounds the subsidy down to zero. After that point, miners earn only fees.
- Forks of Bitcoin and other coins (some altcoins) have their own halving schedules, or none.
- A halving cuts new supply only. It does not touch coins that already exist.
Where the term appears
- News: headlines about halving countdowns and miner profits.
- Mining company reports: revenue per block and hash rate before and after the event.
- Trading platforms: notices on crypto CFDs about trading conditions around high-volatility events. Check the current conditions with your provider.
Leveraged crypto CFDs can lose money fast. Read risk management and regulation and safety before trading.
Related terms
Blockchain · Crypto wallet · Altcoin · Fiat money · DeFi · Gas fees · All-time high · Asset bubble · Trading glossary
Frequent questions
What does Bitcoin halving mean in simple words?
Miners receive half as much new bitcoin per block as before. The supply of bitcoin still grows, but more slowly.
Who decides the halving?
No one decides it. The rule is in the Bitcoin code and triggers at a set block height.
Does the halving make the price go up?
Not necessarily. It slows new supply, but price also depends on demand and wider markets. Nothing guarantees a rise.
Can the halving date change?
The block height is fixed. The calendar date can shift because block times vary.
Are transaction fees halved too?
No. Only the block subsidy is halved.