What is the Halving?

The interval, block heights, and reward amounts are fixed by the protocol. The date of the next halving is a projection that depends on the pace of block production, and the share issued is a point-in-time figure. Price statements in this article record what happened; we make no predictions about future price movements.

The halving (also known as the "halvening") is the moment when Bitcoin's mining reward is cut in half. It happens automatically every 210,000 blocks, roughly every four years.

Bitcoin's total supply is fixed at roughly 21 million BTC (precisely, 20,999,999.9769 BTC). The halving is the mechanism that slows issuance toward that cap. Why the figure lands slightly short of a round 21 million is covered in the article on Bitcoin's controlled supply.

Satoshi Nakamoto hardcoded this rule into Bitcoin from the very beginning. Strictly speaking, a hard fork (a rule change that is not backward compatible) could alter it, but that would take overwhelming agreement among users, miners, exchanges, and wallet providers. Since the supply cap is central to why people hold bitcoin at all, such agreement is treated as unreachable in practice. Much as the yield from gold mining falls over time, Bitcoin is designed to grow steadily scarcer.

The four halvings so far and the next scheduled one, at a glance (prices are rough reference values).

The next halving, the 5th, will occur at block 1,050,000, expected around spring 2028, though the exact date depends on the pace of block production. The last bitcoin is estimated to be issued around the year 2140.

Bitcoin's issuance schedule is entirely predictable. That is fundamentally different from fiat currencies, where central banks can print money at their discretion.

The 20 millionth bitcoin was mined in early March 2026, taking issuance to about 95.2% of the cap. Issuance has continued since: as of August 2026, roughly 20.07 million BTC (about 95.6% of the cap) have been issued. The remaining ~930,000 BTC will be released gradually over the next 114 years or so.

The annual inflation rate, meaning the rate of new issuance, falls with each halving, dropping to approximately 0.84% after the 2024 halving. That is below gold's annual mining dilution rate of roughly 1.6–1.7%, the reciprocal of the stock-to-flow ratio of about 62 discussed below.

Bitcoin's supply curve resembles an S-curve: issuance is rapid early on, then flattens as it approaches 21 million BTC.

Start with where things stand. The increase that followed the fourth halving of April 20, 2024 has already been erased. Bitcoin traded at roughly $64,000 on the day of that halving. It reached an all-time high of $126,080 on October 6, 2025, but as of August 2026 it trades around $64,000, about 50% below that peak and essentially the same level as on halving day. Twenty-eight months on, the net change is close to zero.

Lining up the peak reached 12–18 months after each of the four halvings gives roughly 100x after the 1st, 30x after the 2nd, 8x after the 3rd, and about 2x after the 4th. The multiple has shrunk with every cycle, and as noted above, even that 2x from the fourth halving is not currently being held.

The reasoning usually offered is that reduced supply from the halving, combined with steady or rising demand, shows up in the price as a scarcity premium.

There are substantial counterarguments. (1) The issuance a halving removes amounts to a few hundred BTC per day, which is tiny next to daily trading volume. (2) The date of every halving is calculable years in advance, so an efficient market should have priced it in already. (3) What looks like a four-year cycle can be explained just as well by macro liquidity, the global cycle of monetary easing and tightening, which leaves no way to isolate the halving as the cause. A sample of four events is far too small to distinguish statistically between these explanations.

In any case, there is no guarantee that past patterns will repeat. This article makes no price predictions and confines itself to recording what has been observed. Investment decisions are your own responsibility.

Halvings also affect miner profitability directly. When rewards halve, less efficient miners can no longer break even and tend to exit. This is known as "miner capitulation."

Whether large institutional and ETF inflows have fundamentally altered the traditional four-year cycle or merely delayed it is still debated — and no evidence currently settles the question either way.

The Stock-to-Flow (S2F) ratio is the ratio of existing supply (stock) to annual new supply (flow). A higher value indicates greater scarcity.

Gold's S2F ratio is approximately 62, meaning 62 years' worth of stock exists. After the 2024 halving, Bitcoin's S2F ratio is approximately 120, well above gold's.

The anonymous analyst "PlanB" proposed the S2F model, which holds that Bitcoin's price correlates logarithmically with its S2F ratio. It attracted enormous attention.

The model has been criticized for overfitting historical data and for ignoring demand-side variables.

The objections are not only theoretical: the model's forecasts have already failed empirically. PlanB's model pointed to roughly $100,000 by the end of 2021; the actual price at the end of December 2021 was about $46,000. Statistical rebuttals have also been published arguing that because both the S2F ratio and the price rise over time, their high correlation is spurious regression rather than evidence of causation.

The halving hits miners' business models directly. The reward for the same computing power is halved overnight, which forces a constant push on cost efficiency.

Each halving brings a turnover in hardware generations. Older ASICs can no longer justify their power costs and are replaced by newer, more efficient machines.

When miner revenue drops, hash rate can fall for a time, but the difficulty adjustment restores profitability for the miners who remain.

Over the long run, transaction fees are expected to replace block rewards as miners' main source of revenue. Whether that transition happens smoothly is an open question for Bitcoin's long-term sustainability.

The next halving, the 5th, occurs at block 1,050,000, expected around spring 2028, reducing the mining reward to 1.5625 BTC. Halvings will continue roughly every four years until the full supply of about 21 million BTC (precisely 20,999,999.9769 BTC) is issued around the year 2140.

With each halving, new issuance shrinks toward nothing and miners depend more on transaction fees. Whether that transition can keep the network secure is the major long-term question.

Bitcoin's supply schedule is fully transparent and predictable, in sharp contrast to central bank monetary policy. That property is the basis of its standing as "digital gold."