Imagine a company where every employee's salary is cut in half overnight, on a date known years in advance. Nobody can negotiate, nobody can postpone it. That is exactly what happens to Bitcoin miners roughly every four years.
This event is called the halving. It has been written into Bitcoin's code since the very beginning, and it fuels one of the most popular theories in the crypto market: a four-year cycle that supposedly dictates bullish and bearish phases. Let's look at what the halving really is, what it has produced in the past, and what to expect from it today.
What is the Bitcoin halving?
The halving (sometimes called the "halvening") is the reduction by half of the block reward paid to miners. It happens automatically every 210,000 blocks. Since a block is produced on average every ten minutes, this works out to roughly one halving every four years.
To understand its role, remember how Bitcoin creates new units. The network runs on Proof of Work: miners commit computing power to validate transactions and secure the blockchain. Whoever finds a valid block receives a reward made up of newly created bitcoins plus the transaction fees in that block. If this is unfamiliar, our article on Proof of Work and Proof of Stake explains it in detail.
The halving only affects the "new issuance" part of this reward. Transaction fees are not affected.
The halving is the mechanism that makes Bitcoin disinflationary. Instead of issuing the same amount of bitcoin every year, the protocol slows issuance in steps until it reaches zero.
History of Bitcoin halvings
Since the network launched in 2009, four halvings have taken place.
November 2012 (block 210,000): the reward drops from 50 to 25 BTC per block.
July 2016 (block 420,000): it drops from 25 to 12.5 BTC.
May 2020 (block 630,000): it drops from 12.5 to 6.25 BTC.
April 2024 (block 840,000): it drops from 6.25 to 3.125 BTC.
The next Bitcoin halving is expected at block 1,050,000, most likely in spring 2028, although the exact date depends on the actual pace of block production. The reward will then fall to 1.5625 BTC.
This schedule is directly tied to the 21 million bitcoin cap. Adding up all the successive rewards (210,000 blocks at 50 BTC, then 210,000 at 25 BTC, and so on) gives a series that converges toward 21 million. More than 93% of those bitcoins have already been mined. The last satoshis should be issued around 2140, after which miners will be paid by fees alone. To put this cap in a broader perspective, read our analysis of maximum supply and crypto inflation.
The impact of the halving on miners
For miners, the halving is an immediate economic shock. Overnight, their bitcoin income from the block reward is cut in half, while their costs (electricity, hardware, maintenance) stay the same.
The least efficient miners are pushed out. Those paying too much for electricity or running older machines become unprofitable if the Bitcoin price does not offset the drop. Historically, the hashrate (the network's total computing power) has sometimes dipped temporarily around halvings, then recovered as hardware improves and the most competitive players take over.
Industry consolidation speeds up. Each halving favors large industrial operators with access to cheap energy and the latest machines.
Transaction fees become more important. As the block reward shrinks, fees must gradually make up a larger share of miners' income to keep the network secure. This is one of the big long-term debates around Bitcoin: will fees be enough to fund security once issuance becomes marginal? Nobody has a definitive answer today.
Halving and Bitcoin price: what history says
This is the question most investors care about. And the track record is striking.
After each of the first three halvings (2012, 2016, 2020), Bitcoin went through a strong bull market within the following 12 to 18 months, before peaking and then suffering a severe correction. This pattern gave rise to the "halving cycle" theory: accumulation before the halving, a rally in the year that follows, euphoria, then a bear market.
The theoretical argument is a supply shock. If demand stays stable and new supply is cut in half, selling pressure from miners (who sell part of their bitcoins to cover costs) mechanically drops, which can support the price.
This cycle also fits a well-known psychological dynamic, which we describe in our article on market psychology and crypto cycles. The euphoric phases that follow, and how to spot them, are covered in our guide to the crypto bull run.
Why the cycle theory needs nuance
Three cycles is very little to establish a law. Several factors call for caution.
Correlation is not causation. The bull markets of 2013, 2017 and 2021 coincided with other powerful forces: growing adoption, new market participants, and above all the monetary backdrop. The 2020 to 2021 cycle played out in an environment of very low interest rates and abundant liquidity, whose effect is hard to separate from that of the halving.
The supply shock shrinks with every halving. In 2012, annual issuance represented a large share of existing bitcoins. After the 2024 halving, annual issuance is less than 1% of circulating supply, or about 164,000 BTC per year. Halving a flow that is already small has a much more limited relative impact than it did in the early years.
The market's drivers have changed. Since spot Bitcoin ETFs launched in the United States in January 2024, institutional flows weigh heavily on the price. Notably, Bitcoin hit a new all-time high in March 2024, before the fourth halving even happened, something that had never occurred in previous cycles. Central bank decisions, risk appetite and regulation now influence the market at least as much as the issuance schedule.
A known event is partly priced in. The halving date is predictable years in advance. In an efficient market, part of its expected effect is already reflected in the price.
How investors should think about the halving
The halving is an important structural fact: it guarantees that Bitcoin's supply becomes scarcer and scarcer. But on its own it is not a reliable buy or sell signal.
Don't try to time the market around the halving. Betting on a specific rise on a specific date means risking buying at the wrong time, especially if euphoria has already set in before the event.
Favor a steady approach. A DCA strategy, which consists of investing a fixed amount at regular intervals, lets you move through cycles without depending on a historical pattern that may not repeat.
Watch context indicators. Rather than relying on the halving alone, keep an eye on Bitcoin dominance, ETF flows, the macroeconomic backdrop and market sentiment. These will often tell you more about the phase of the cycle than the countdown to the next halving.
Finally, keep a clear view of your real exposure. Tracking your portfolio in Exceefy lets you measure your performance over an entire cycle, not just around a heavily publicized event.
FAQ
When is the next Bitcoin halving?
The next halving is expected at block 1,050,000, most likely in spring 2028. The exact date depends on the actual speed of block production. The reward will then drop from 3.125 to 1.5625 BTC per block.
Does the halving always push the Bitcoin price up?
No, nothing guarantees it. The first three halvings were followed by bull markets within 12 to 18 months, but those rallies coincided with other factors (adoption, monetary conditions). The supply shock effect shrinks with each halving, and past performance is no guarantee of future results.
What happens when all bitcoins have been mined?
Around 2140, the issuance of new bitcoins will stop. Miners will then be paid solely through transaction fees. Whether those fees will be enough to maintain a high level of security remains an open question.
Does the halving apply to other cryptocurrencies?
Yes, some Bitcoin-inspired blockchains have adopted this mechanism, such as Litecoin or Bitcoin Cash, each with its own schedule. Most Proof of Stake blockchains, however, use different issuance models.
