A Bitcoin halving is the point at which the reward for adding a new block to Bitcoin's ledger is cut in half. That cut halves the rate at which new bitcoins are created. It happens automatically every 210,000 blocks, which works out to roughly every four years. The most recent halving, on April 20, 2024, cut the reward from 6.25 to 3.125 bitcoin per block. The next one is expected around April 2028 and will take the reward to 1.5625.

The term usually appears alongside price forecasts and talk of a "four-year cycle." What a halving decides is narrower than that. It sets how many new coins enter circulation. Whether that changes the price depends on demand, and on that question the history is less reliable than the headlines make it sound.

How a halving happens

Bitcoin's ledger is built from blocks, which are batches of transactions added one after another. Miners are the computers that compete to add each new block. The winner collects the block reward: a set amount of newly created bitcoin, plus the fees attached to the transactions in that block. The network is designed to produce about one block every ten minutes.

Bitcoin's software also contains a rule that halves the newly created portion of that reward every 210,000 blocks. No one votes on it, and no one schedules it. CoinGecko describes it as "programmed directly into Bitcoin's code". The trigger is a block number, not a calendar date. At ten minutes a block, 210,000 blocks comes to about 2.1 million minutes, which is just under four years.

The reward began at 50 bitcoin. Each halving shrinks the stream of new coins, so total supply rises more and more slowly toward Bitcoin's fixed cap of 21 million.

What the 2024 cut meant in coins per day

This uses the ten-minute design target. Real blocks arrive a little faster or slower than that, so these figures are close but not exact.

Blocks per day (6 an hour x 24)144
New coins per day before April 2024 (144 x 6.25)900 BTC
New coins per day after April 2024 (144 x 3.125)450 BTC
New coins per day after the 2028 halving (144 x 1.5625)225 BTC

At the current rate, about 160,000 new coins are created a year, which matches the 21Shares 2026 outlook. Amberdata valued the 450 coins a day removed in 2024 at roughly $40 million. Over the same period, spot bitcoin ETFs routinely saw $500 million or more move in a single day.

Because the trigger is a block number, the date of each halving is always an estimate. In early October 2026, CoinGecko's halving countdown showed block 969,466. That left 80,534 blocks until block 1,050,000, which it estimated would arrive around April 17, 2028. Blocks tend to come slightly faster than ten minutes when mining capacity is growing, so the date can move earlier.

Four halvings, four different aftermaths

November 2012, block 210,000. The reward fell from 50 to 25, with bitcoin at about $12. Twelve months later it was about $1,150. The market was tiny and illiquid at the time, so how much of that rise came from the halving is unclear.

July 2016, block 420,000. The reward fell from 25 to 12.5, with bitcoin at about $650. According to Kraken, the price fell roughly 40% shortly afterward. It then climbed to nearly $20,000 by the end of 2017.

May 2020, block 630,000. The reward fell from 12.5 to 6.25, with bitcoin at about $8,600 during the early pandemic. It peaked near $69,000 in November 2021.

April 2024, block 840,000. The reward fell from 6.25 to 3.125, with bitcoin at about $64,000. This time the cycle high of about $73,800 came in March 2024, a month before the halving. Analysts at btclyzer attribute the change to the new spot ETFs, which they argue priced in the scarcity ahead of time. One year after the halving, the price was up about 33%.

Taken together, the rallies have shrunk each cycle. The price multiplied about 95 times after 2012, 30 times after 2016 and 6.6 times after 2020. Every one of those peaks was followed by a bear market that took the price down 77% to 85%.

Miners feel the cut directly. In the year after the 2024 halving, network computing power rose about 40%. Over the same year, revenue per unit of that computing power fell about 60%.

Not a split, and not a price signal

The word suggests that something you own gets cut in half. It does not. A stock split changes the number of shares you hold. A halving only changes how many new coins miners receive, and the bitcoin already in your wallet, IRA or ETF stays exactly as it was.

A halving is also not proof that the price will rise. Every halving so far has been followed by a large rally at some point. That is a pattern across four data points, and it does not establish cause and effect. More cycles in which ETF demand is a large factor would help show whether the pattern still holds.

What changes for someone holding through an ETF or an IRA

On the day of a halving, nothing in your account changes. It is not a transaction, and there is nothing to do.

What the history argues against is timing purchases around the halving. In 2024 the peak arrived before the cut. Then, according to BTCC, the price fell below $60,000 in the first half of 2026, a drop of more than 30% from the start of the year. Steady purchases on a fixed schedule do not require you to guess which way the cycle will break.

Demand now carries more weight than the supply cut. Institutional ETF products hold more than a million bitcoin. On March 30, 2026, the Department of Labor proposed a rule that would let 401(k) plans include crypto. Market commentators see changes like these as larger drivers than the halving itself, and the shift in how spot ETFs changed access is part of the reason.

Size your position so that a 77% to 85% drawdown would not force you to sell. On the Bogleheads forum, investors who hold bitcoin often settle on 1% to 3% of their portfolio. If the mechanics of blocks and mining are still new to you, start with how Bitcoin works.