Halving headlines often say Bitcoin's “supply is falling”. More precisely, existing bitcoins do not disappear; the amount newly issued with each block decreases. That distinction is essential to understanding a halving.
The part cut in half is the block subsidy
- Block subsidy: New bitcoin issued under the rules when a block is mined.
- Transaction fees: Fees paid by transactions included in that block.
- Mining reward: Often refers to the subsidy plus fees. A halving does not halve both components.
Bitcoin is designed to halve the subsidy every 210,000 blocks. Based on the average block interval, this is described as roughly once every four years, but it is not fixed to a particular calendar date.
An issuance schedule that began at 50 BTC
The subsidy began at 50 BTC, then fell to 25, 12.5 and 6.25 BTC, reaching 3.125 BTC with the 2024 halving. The same number of blocks therefore produces fewer newly issued bitcoins.
A holder's wallet balance is not cut in half. A halving is also different from a unit split or token burn.
What changes for miners and the market?
Other things equal, earning the same subsidy income becomes harder for miners. Actual profitability depends on Bitcoin's price, fees, electricity costs, hardware efficiency and competition among miners.
Slower supply growth and a claim that prices must rise are different statements. Halvings follow a known schedule, while demand, interest rates, liquidity and market expectations also influence prices. Charts following previous halvings alone are not enough to predict the next return.
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