The Four-Year Bitcoin Cycle Explained: Does It Still Work?

The four-year bitcoin cycle is the pattern in which bitcoin's price has moved through a boom-and-bust rhythm of roughly four years, closely aligned with the halving that cuts new bitcoin supply every 210,000 blocks. Whether it still works is genuinely uncertain: it held well enough through the first three cycles, but it is based on very few data points, and new forces such as spot ETFs and institutional ownership may weaken it.

This guide explains where the idea comes from, what the history up to mid-2025 shows, the arguments for and against the cycle persisting, and how to use it sensibly when thinking about 2026 and 2027.

Where the Four-Year Cycle Comes From

Bitcoin's supply schedule is fixed in code. Miners receive a block subsidy that halves every 210,000 blocks, which works out to about every four years. The subsidy started at 50 BTC per block in 2009 and is 3.125 BTC after the April 2024 halving. Total supply is capped at 21 million. If the halving is new to you, start with what the bitcoin halving is.

The theory behind the cycle is simple: miners sell part of their new coins to pay costs. When the flow of new coins halves, that steady selling pressure drops. If demand stays flat or grows, price has to adjust upward. Rising prices then attract attention, new buyers and leverage, which push prices beyond fair value until the market tips into a bear phase. See also: Crypto Supercycle Theory.

What the History Shows Up to Mid-2025

The pattern looks like this in broad terms:

Two features stand out. First, each peak arrived roughly a year to a year and a half after the halving. Second, each subsequent percentage gain was smaller than the one before, which is consistent with a larger and more mature market. For more detail, see our article on halving cycles and price history.

The 2024 cycle already broke one habit: bitcoin set a new all-time high in March 2024, before the halving, helped by demand from the newly approved US spot bitcoin ETFs. In earlier cycles, new highs came only after the halving.

Arguments That the Cycle Still Works

• Supply mechanics haven't changed. Halvings still happen on schedule and still reduce miner issuance.
• Psychology repeats. Many market participants know about the cycle and act on it, which can make the pattern partly self-fulfilling.
• Leverage dynamics. Bull markets still build up leverage that eventually unwinds in liquidation cascades, creating sharp tops.

Arguments That It May Be Fading

• Shrinking supply effect. Each halving cuts a smaller absolute number of new coins. With well over 90% of all bitcoin already mined, the change in issuance matters less relative to trading volume and ETF flows.
• New demand channels. Spot ETFs and corporate treasuries can create large, steady buying or selling that has nothing to do with the halving calendar.
• Macro dominance. Bitcoin has increasingly traded alongside global liquidity and interest-rate expectations. A cycle in central-bank policy may matter more than a four-year code schedule. Our guide to global liquidity and bitcoin explains that link.
• Small sample. Three full cycles are not enough to separate cause from coincidence. Notably, the 2020 cycle coincided with an unusually large monetary stimulus.

How to Think About 2026 and 2027

If the classic pattern held, the period after the 2024 halving would include a peak followed by a bear phase, with 2026 sitting in or near the downturn and the run-up to the 2028 halving beginning around 2027. That is what the cycle template implies, not what will necessarily happen.

Instead of assuming that template, watch for evidence:

1. 1Where price sits relative to its prior high. Look at the long-term chart on the bitcoin price page and our historical data.
2. 2ETF flows. Sustained inflows or outflows can override cycle timing.
3. 3Liquidity and rates. Easing conditions have historically supported risk assets; tightening has hurt them.
4. 4Leverage and sentiment. Extreme greed and record open interest have often marked late-stage rallies.

Three scenarios help frame it. In a cycle-intact scenario, 2026–2027 resembles past post-peak years: a bear market, then gradual recovery. In a stretched-cycle scenario, institutional demand extends the timeline so peaks and troughs arrive later and are shallower. In a broken-cycle scenario, bitcoin trades mainly on macro conditions, and the halving calendar loses predictive value. Our article Bitcoin Price Prediction 2027 expands on this point.

Risk Management Regardless of the Cycle

Because nobody knows which scenario applies, plan for several:

• Size positions so a deep drawdown is survivable. Past bear markets cut bitcoin's price by more than three-quarters. See position sizing and risk management basics.
• Use dollar-cost averaging if you are building a long-term position, so you don't need to time the cycle.
• Take profits in stages during strong rallies rather than waiting for a perfect top.
• Avoid leverage based on cycle timing; a few weeks of being early can wipe out a leveraged account.
• Watch for scams that use cycle talk, such as "guaranteed halving returns" schemes. Our guide on how to spot a crypto scam lists the warning signs.

Bottom line

The four-year bitcoin cycle is one of the most-watched patterns in crypto, and it has described past booms and busts surprisingly well. But it rests on a handful of examples, and the forces driving bitcoin are changing. Treat the cycle as a useful map of what could happen in 2026 and 2027, check the live data to see what is happening, and build a plan that still works if the map turns out to be wrong.