The Bitcoin Halving - What is it and When Will it Happen?

The Bitcoin halving is a pre-programmed event that reduces the number of new Bitcoin created with each block by exactly 50 per cent. Instead of a central bank choosing when and how much new money to create, the Bitcoin protocol follows a fixed schedule that steadily lowers its own inflation rate over time.

This reduction is important because it helps limit total supply. By making new coins harder to obtain as time passes, Bitcoin is designed to behave more like a scarce commodity than a traditional digital balance.

How it works in practice

You can think of a blockchain as a shared public ledger. People known as miners use specialised computers to group new transactions into blocks, check that they are valid, and add them to this ledger. In return for doing this work, the protocol rewards miners with new coins, known as the block subsidy, plus any transaction fees paid by users.

The halving mechanism controls how much of this new supply is released. Every 210,000 blocks, which usually takes around four years, the Bitcoin software automatically cuts the block subsidy in half.

When Bitcoin launched in 2009, the block reward was 50 BTC. After a series of halvings, this reward had fallen to 3.125 BTC per block by April 2024. This process will continue until the total number of coins in existence reaches 21 million, which is expected to occur around the year 2140. After that point, miners are expected to rely only on transaction fees as their income from the network.

The impact on price and market cycles

Each halving reduces the amount of new Bitcoin that enters circulation every day. In economic terms, this lowers the growth rate of supply.

If demand for Bitcoin remains steady, or rises, while the flow of new coins falls, this can create upward pressure on price. In practice, outcomes are more complex, because Bitcoin trades in global markets and its price is affected by many factors, including regulation, macroeconomic conditions and broader sentiment toward crypto-assets.

Historically, past halving events have taken place before periods of significant price growth. Media coverage and market speculation around the idea of a “shrinking supply” have often increased trading activity around these dates.

However, there is no guarantee that this pattern will continue. Past performance is not a reliable guide to future results. The halving is only one part of Bitcoin’s economic design and should not be seen as a mechanism that ensures price increases.

Risks and red flags to stay safe

Although many investors view the halving as a positive long-term feature, it also introduces specific risks that users and potential investors should understand.

• Network security risks
  When the block reward is cut in half, a miner’s main source of income also falls by half. If the market price of Bitcoin does not rise enough to offset this, some miners may switch off their equipment because it is no longer profitable to operate. This can temporarily reduce the total computing power (hash rate) that secures the network. A lower hash rate can make the network less resilient to some types of attack until mining activity adjusts.

• Fee volatility
  Over time, as the block subsidy falls, transaction fees are expected to become a larger part of miner income. During periods of high demand, users may compete to have their transactions confirmed more quickly by paying higher fees. This can make using the network more expensive, especially for smaller payments. There is ongoing debate about whether fees alone will be enough to maintain strong network security in the distant future.

• Halving-related scams
  High-profile events in crypto often attract criminals. Some may promote “halving investment schemes” or trading products that claim to guarantee profits from the next halving. Others may encourage users to move funds to unregulated platforms or wallets with promises of special rewards. Any claim of risk-free or guaranteed returns, especially tied to a specific event such as a halving, should be treated with extreme caution.

• Phishing attempts and fake giveaways
  Fraudsters regularly use fake websites, social media profiles and emails that reference the halving to try to steal funds. They may offer “limited time” giveaways, bonus BTC, or airdrops that require you to connect your wallet or share private information. Never enter your recovery phrase or private keys on any website, and do not click on links from unknown or unverified sources. Genuine services will never ask you to reveal your private keys.

Why the Bitcoin halving matters

The Bitcoin halving is not only a technical event. It is also a key part of Bitcoin’s approach to monetary policy.

By fixing the maximum supply at 21 million coins and using a predictable schedule for new issuance, Bitcoin stands in contrast to traditional fiat currencies such as the euro, where central banks can adjust the money supply in response to economic conditions. Supporters argue that this transparency and predictability can be attractive for people who are concerned about inflation or currency debasement.

This model of controlled supply has influenced the design of many other crypto-assets, which have adopted their own emission schedules or supply caps. At the same time, it is important to recognise that a fixed supply does not guarantee price stability or future demand, and that crypto-assets remain highly speculative.

Users and prospective investors should consider both the potential benefits and the risks, including price volatility, regulatory changes, and the possibility of technological or market failures.