Halving

A scheduled reduction in the rate at which new coins are created.

Also called: bitcoin halving · halvening

In plain language

Bitcoin’s halving occurs roughly every four years, cutting the block reward in half and slowing the growth of supply.

It is fully known in advance, which is exactly why its price impact is debated. Markets generally price in scheduled events ahead of time.

The event itself is often quiet. The volatility tends to arrive in the anticipation and the aftermath rather than on the day.

Worked through

The April 2024 halving, known about for four years

Block reward before: 6.25 BTC
Block reward after: 3.125 BTC
Date known in advance: since 2020
Participants unaware: none

Bitcoin’s issuance schedule is written into the software. The April 2024 halving cut the block reward from 6.25 to 3.125 BTC, on a date every participant could calculate years ahead, from a supply change nobody had to discover.

That is precisely what makes it a poor thing to trade. A market prices what it knows, and it had four years to know this. Whatever the halving is worth was being paid for long before the day arrived — which is why the day itself is usually uneventful while the months either side are not.

The deeper trap is the sample size. There have been four halvings. Four observations of anything, each in a completely different market with different participants and different rates, is a story rather than evidence. Sizing up on a pattern with n = 4 is not a strategy, and the history of markets is largely the history of people discovering that.

Why it matters

Halvings are a useful reminder that a well-known future event is already reflected in price. Trading a date everyone has on their calendar is rarely an edge.