What it is
The Bitcoin halving is a pre-programmed event embedded in Bitcoin's code that cuts the block reward in half. It happens roughly every 210,000 blocks, or approximately every four years. This mechanism controls the supply of new bitcoins entering circulation, making Bitcoin a deflationary asset. The halving schedule continues until the maximum supply of 21 million bitcoins is reached, expected around the year 2140.
Halving events, such as those in 2012, 2016, 2020, and 2024, are major market catalysts often associated with increased price volatility and investor speculation. Miners see their block subsidy reduced, potentially impacting their profitability and leading to adjustments in hash rate and mining difficulty. News coverage often focuses on the supply shock and its potential long-term effects on Bitcoin's value.
Why it matters
Halving events significantly impact Bitcoin's supply dynamics, influencing its scarcity and often leading to price speculation. Understanding them is crucial for long-term investors.
Reviewed under editorial standardsUpdated September 26, 2026Not investment advice