What Is the Bitcoin Halving and Why Does It Matter?

The bitcoin halving is a scheduled event, occurring every 210,000 blocks or roughly every four years, that cuts the issuance of new bitcoin in half. At the most recent halving in April 2024, the reward paid to miners fell from 6.25 to 3.125 bitcoin per block. It matters because it makes bitcoin the only major monetary asset whose new supply shrinks on a fixed, public timetable.

How new bitcoin enters circulation

New bitcoin is created in exactly one way. Roughly every ten minutes, a miner adds a new block of transactions to the ledger and collects a reward of newly issued coins, called the block subsidy. When the network launched in January 2009, that subsidy was 50 bitcoin per block. There is no other issuance: no treasury, no founder allocation that can be expanded, no committee that can vote to print more. If you know the block height, you know precisely how many coins exist.

This is worth pausing on, because it has no parallel in traditional assets. Anyone with a modest computer can run bitcoin software and independently audit the entire supply, coin by coin, without trusting an auditor, a government statistic, or a mining company's disclosure. Gold's above-ground stock, by contrast, is an informed estimate, and no one can be entirely certain how much sits in private vaults or unrecorded jewelry. Bitcoin's supply is not just limited; it is countable.

The halving schedule so far

The subsidy is cut in half every 210,000 blocks. The first halving, in November 2012, reduced it from 50 to 25 bitcoin. July 2016 brought it to 12.5, May 2020 to 6.25, and April 2024 to the current 3.125. The next halving, expected around 2028, will bring it to 1.5625. At today's rate, about 450 new bitcoin are issued per day, and each halving cuts that flow in half again. More than 94 percent of all bitcoin that will ever exist has already been issued.

Why the halving matters: scarcity you can verify

Economists sometimes describe monetary assets by comparing existing stock to new annual flow. Gold scores well here: mines add roughly 3,000 to 3,500 tonnes a year to an above-ground stock of about 216,000 tonnes, so supply grows around 1.5 percent annually. Bitcoin's issuance is already below 1 percent per year and, unlike gold's, it keeps falling on schedule.

There is a second difference worth understanding. When the gold price rises, miners respond by digging more, which gradually increases supply. Bitcoin cannot respond this way. If more miners join the network, a built-in difficulty adjustment makes the puzzle harder, keeping blocks near ten minutes apart and issuance on schedule. Higher prices attract more mining power, but they do not produce more coins. The halving is the visible expression of that rigidity.

Halvings and price: what history shows, and what it does not

Each of the four halvings so far has been followed, within a year or two, by a substantial rise in bitcoin's price, and this pattern has produced an entire genre of prediction. Treat it with caution. Four events is a small sample, markets increasingly anticipate the halving in advance, and each cycle's gains have been smaller in percentage terms than the last. The honest statement is this: the halving reliably reduces new supply, and reduced supply matters only if demand holds or grows. The supply side is certain. The demand side never is.

For gold holders, the useful comparison is this: imagine knowing today, with certainty, that every gold mine on earth would cut its output in half on a fixed date in 2028, then again four years later, forever. No such promise is possible for a physical commodity. Bitcoin's halving is that promise, kept automatically, which is why analysts pay so much attention to a mechanical event announced seventeen years in advance.

The long endgame

Halvings continue until around the year 2140, when the last fraction of the 21 millionth coin is issued and the subsidy reaches zero. From then on, miners will be paid entirely through transaction fees, which they already collect today alongside the subsidy. Long before that date, the subsidy becomes negligible: by the 2030s, well over 98 percent of all coins will exist. In practical terms, bitcoin's supply story is nearly finished, and the halving is the metronome marking its final movements.

To see how bitcoin's fixed issuance schedule compares with gold's slow but open-ended supply growth, our gold versus bitcoin comparison section covers both in detail.