Bitcoin halving explained: mechanics, history and 2028
Learn what a Bitcoin halving is, how the block subsidy changes every 210,000 blocks, why the next event is estimated around 2028, and how fees fit in.
Direct answer
A Bitcoin halving cuts the block subsidy at each 210,000-block interval; the next event is estimated around 2028 because block production is not a fixed calendar.
The Bitcoin network issues new bitcoin through the block subsidy. At the start of the network, the subsidy was 50 bitcoin per block. It halves every 210,000 blocks under Bitcoin’s consensus rules.[2]
What is a Bitcoin halving?
A Bitcoin halving is the scheduled reduction of the block subsidy after each 210,000-block interval. It changes new issuance; it does not set bitcoin’s price or transaction fees.[2]
How does the 210,000-block rule work?
Bitcoin applies each subsidy reduction at a block-height boundary, not on a specified date. A 210,000-block interval separates each halving event.
| Halving | Block subsidy after the event |
|---|---|
| 2012 | 25 bitcoin |
| 2016 | 12.5 bitcoin |
| 2020 | 6.25 bitcoin |
| 2024 | 3.125 bitcoin |
What happens to the block subsidy?
At a halving, the block subsidy is cut in half under the consensus rules. The table records the subsidy after each completed event; it does not describe market performance.
What do miners earn besides the subsidy?
A miner that produces a valid block can receive the block subsidy and transaction fees included in that block. These are separate components: a halving reduces the subsidy but does not determine fees or overall miner revenue.
When is the next Bitcoin halving?
The next halving is commonly estimated around 2028 because the event occurs at the next relevant block-height boundary. Individual blocks can arrive sooner or later than average, so a calendar date is only an estimate.
A halving does not determine bitcoin’s price, demand, transaction fees, mining profitability or future network conditions. How many bitcoins exist? covers the overall supply limit, issued bitcoin and lost-coin uncertainty.
Frequently asked questions
Does a Bitcoin halving happen on a fixed date?
No. It is triggered at each 210,000-block interval. A calendar date is only an estimate because blocks do not arrive on a fixed schedule. BIP 42
Does a halving determine bitcoin’s price?
No. A halving changes the block subsidy. It does not determine price, demand, fees, mining profitability or future network conditions.
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