The Bitcoin Calendar - When People (Mostly) Buy and Sell Their Bitcoin

Most Bitcoin investors experience the same emotional rollercoaster, year after year, without realizing they’re watching a script.

The pattern isn’t random. It isn’t the market being “irrational.” It’s a predictable mix of tax deadlines, cultural traditions, institutional behavior, and sheer human psychology never quite repeating but darn is there a lot of rhyming going on.

Here’s what you should keep an eye out for oh yeah and also, glaringly… shockingly… this is Not Financial Advice.

Every December, a specific type of selling floods the Bitcoin market that isn’t panic or fundamentals… it’s the dreaded end of year accounting with tax loss harvesting.

Tax loss harvesting is the practice of selling an asset at a loss to offset capital gains elsewhere in your portfolio.

So if you made $50,000 on stocks this year but you’re sitting on $30,000 in unrealized Bitcoin losses, selling that Bitcoin before December 31 reduces your taxable gains to $20,000.

It’s what any financial advisor worth their salt would recommend and the reason it works so well is the wash-sale rule which normally forces stock investors to wait 31 days before repurchasing the same asset but does not apply to cryptocurrency.

Bitcoin is classified as property, not a security.

This means crypto holders can sell and repurchase Bitcoin in the same session without triggering wash-sale limitations which as a consequence concentrates selling and rebuying activity into the most tax-sensitive days at year-end rather than spreading it across the quarter.

Which for us means there tends to be a wave of coordinated selling in the final weeks of December, followed by coordinated buying in early January and February as those same investors repurchase to restore their positions.

I only say February because even though there is no official Wash Sale rule, some financial folks are still paranoid and avoid the 31 day cool down period.

These coordinated buybacks have fueled Bitcoin price rebounds at the start of most years.

There’s also a second sell pressure mechanism where professional fund managers engage in “window dressing” as they prepare year-end reports for clients — selling underperforming assets so those holdings don’t appear on annual statements and they also may increase positions in top performers to show they own winning assets which is… pretty smart.

Add in holiday illiquidity — thinner markets, fewer active traders, leveraged traders closing positions before Christmas travel — and you get an environment where even modest selling pressure produces outsized price moves.

The numbers reflect this. Through 2024, December has finished with Bitcoin higher only 5 out of 12 years since 2013 — meaning it has been in the red 7 times.

The median December return is actually negative (-3.2%), even though the average looks positive because a few monster Decembers (2016, 2017, 2020 all gained 25%+) pull the mean up.

Strip those outliers out and December is quietly one of Bitcoin’s worst months which for us means a great buying opportunity.

January typically brings relief. The tax-loss sellers have done their job. Fresh capital enters and sentiment resets.

But there’s a subplot that most Western investors miss entirely.

China, despite officially banning crypto trading, has an estimated 59 million cryptocurrency holders which is roughly the same amount of crypto owned by American’s.

And every January or February (depending on the lunar calendar) they do the Lunar New Year.

The Spring Festival is the world’s largest annual human migration.

Hundreds of millions of people travel home. Gifts and cash are exchanged and red packets stuffed with money are a central tradition.

Since these people prepare for family gatherings, gift-giving, and celebrations, they often sell some of their crypto to cover expenses prior to the holiday.

The selling pressure typically begins two to four weeks before the festival. It’s quiet, gradual, and easy to miss if you don’t know what you’re watching.

In 2024, Bitcoin fell to as low as $38,678 by January 23 — potentially as a consequence of the pre-Chinese New Year selloff — before rising significantly to $56,650 by February 27, ten days after the celebration ended.

The pattern is dip, then rip. Sell before the holiday, recover after it.

The liquidity picture matters here too. Many crypto traders in Asian regions take extended breaks during the festival, reducing overall market participation and liquidity — factors that can amplify price swings.

So in the January-February window, you’re often navigating two overlapping effects: the post-tax-loss-harvesting rebound from December and the pre-Chinese New Year softness.

The two can partially cancel each other out, creating choppiness rather than a clean recovery so it would behoove you to be prepared for both scenarios.

Tax Day in America falls on April 15. That date does things to Bitcoin every single year.

Here’s the mechanics: U.S. investors who sold Bitcoin at a profit during the previous year owe capital gains taxes by April 15. Some of those investors particularly those who didn’t set aside funds throughout the year and sell Bitcoin specifically to raise cash to pay the IRS.

The 30-day returns are usually negative around the time of tax deadlines in many countries such as the US and the UK in late March and early April.

Out of nine years, the 30-day return was negative seven times during this period.

Woof.

That’s a 78% historical hit rate for weakness in early April those are dentist numbers if you ask me.

The deadline creates what some analysts have started calling Bitcoin’s “Magic Day.”

Crypto markets typically remain flat or slightly weaker in the days before the deadline, then see a more bullish setup once tax-driven selling subsides.

Bitwise CIO Matt Hougan described it well: once tax-driven selling subsides after April 15, relief buying and redeployed capital historically produces a 5 to 8 percent Bitcoin rally in the two weeks that follow.

And zooming out, April as a whole month actually has a surprisingly strong track record.

Bitcoin has closed April in the green 9 out of 13 times since 2013, giving it close to a 70% win rate, with a median April return of 7.1%.

The strategy implied here isn’t complicated: the first two weeks of April have historically offered better entry points than the last two.

The selling pressure is mechanical and temporary. Once it clears, buyers step in.

After Q1 declines driven by sentiment and external shocks, April produced strong recoveries in 2018, 2020, and 2025 of +33.5%, +34.5%, and +14.1% respectively.

The pattern also extends to the UK, Australia, and other markets with spring tax deadlines that roughly align with the American calendar.

The pressure does stack during this time but it’s not a bad time to deploy some dry powder.

“Sell in May and go away” is one of the oldest clichés in traditional finance and as Bitcoin becomes more intertwined with the financial system this will also map on.

After the April tax-season bounce, Bitcoin tends to drift.

Volume thins like your dad’s hair. Volatility compresses. Institutional traders head out to their house in the Hampton’s and the narrative machine slows down.

Bitcoin tends to experience a price decline from the start of April through the start of June, with short positions succeeding 80% of the time over the past five years during this stretch.

May tends to be a mixed bag and June often marks the transition into genuine summer weakness and August stands out as one of the most consistently bearish months, with short positions succeeding at an 80-100% rate depending on the timeframe analyzed.

Why? A few factors converge:

Liquidity drops. Institutional desks are understaffed through August. Decision-makers are on vacation. Fewer big buyers means prices drift on smaller flows. For what it’s worth, August has averaged -0.54% going back to 2010 — one of only two months with a negative long-run average alongside September.

Narrative vacuum. The first half of the year tends to generate most of the year’s regulatory headlines, product launches, and macro catalysts. Summer often brings quiet.

Psychological fatigue. Retail investors who chased the Q1 rally and got burned are sitting on the sidelines.

The summer slump is rarely catastrophic — it’s more of a slow bleed than a crash. But it’s persistent enough to be worthy of your attention and to not be surprised if things are bad during that time.

If summer is the slump, September is the pit.

The data here is striking.

Coinglass data since 2013 shows September closing in the red 8 out of 11 years — a 73% hit rate for negative months. The average September loss comes in at -4.78%, making it the only month in Bitcoin’s calendar with a consistently negative average return.

No one has fully explained why September is so reliably bad but there are theories:

The silver lining: September weakness historically sets up one of the most reliable seasonal trades in the entire crypto calendar.

October has a nickname and it is earned.

Data from Coinglass shows that since 2013, Bitcoin has closed October in positive territory 10 out of 12 years. Standout years include 2013 (+60.79%), 2017 (+47.81%), 2021 (+39.93%), and 2023 (+28.52%).

Over the past ten years, Bitcoin has posted an average October return of +20% — far ahead of any other month in the calendar.

Why October? A few reinforcing factors:

Q4 opens and institutional investors return from summer. Capital that sat idle in August and September gets redeployed and there’s a structural tendency for portfolio managers to add risk heading into the final quarter of the year.

Bitcoin-specific event cycles have also historically clustered around Q4 — ETF approvals, regulatory announcements, halving cycle dynamics. The 2021 futures ETF approval landed in October.

Maybe for Halloween we should all dress up as Bitcoin’s.

Let’s also not forget the self-fulfilling element.

When enough traders expect October to be strong, liquidity and buying pressure often meet that expectation, creating a narrative-driven momentum effect.

That said: “Uptober” is a seasonal tendency, not a law of nature.

2025 was a reminder of that.

Bitcoin set a new record above $126,000 in the first week of October 2025, then a flash sell-off erased those early gains within days, and the month closed lower — a reminder that slogans don’t absorb supply and if there are more sellers than buyers then prices go down.

Seasonality is context.

November — sometimes called “Moonvember” by the more enthusiastic corners of crypto Twitter — has historically continued October’s momentum.

7 out of 11 Novembers have closed green since 2013, with an average return of 46.81% — the highest average return of any month in Bitcoin’s history.

Long trades in November have shown 67% success rates over three and five-year windows, making it a reliable continuation month before year-end repositioning begins.

The November rally, when it happens, tends to be where the year’s biggest price appreciation occurs.

November 2021 was Bitcoin’s all-time high at the time. November 2020 was a breakout month. The pattern of October building steam and November delivering results has repeated enough to be notable.

Then December arrives and the cycle resets.

The selling that investors observe in December is not random — it results from tax incentives, institutional reporting requirements, and reduced market liquidity during holiday periods.

Year after year, the same forces play out. The same calendar pressure. The same mechanics.

A few observations worth sitting with:

The dips have explanations. When Bitcoin drops in December or early April, it’s rarely because something is fundamentally broken. It’s because a predictable financial calendar is doing what it always does. That context changes how you respond.

The reboundsare structural too. The January bounce and the post-April-15 pop aren’t accidents. They’re mechanical. The sellers run out. The buyers who were waiting step in.

You can use this. Not as a trading system — seasonality is context, not a guarantee — but as a frame for sizing up risk and opportunity. Adding Bitcoin in early-to-mid April historically beats adding in early May. Accumulating through the summer historically beats chasing the October rally.

But macro overrides everything. The seasonal calendar describes what happens in normal years.

A genuine bear market, a macro shock, or a structural industry problem breaks the seasonal script. 2022 was a calendar year. The seasons played out roughly on schedule — inside a devastating bear market. The pattern is real. It’s just not the only pattern.

Here’s what the seasonal calendar really tells you about Bitcoin.

It’s maturing.

The fact that a consistent, globally-recognized seasonal pattern has emerged around American tax deadlines, Chinese holidays, and institutional Q4 rebalancing tells you something important: Bitcoin is deeply embedded in the global financial system now.

It’s not outside the system anymore. It moves with it.

That’s not bearish. It’s exactly what an asset looks like as it transitions from speculative curiosity to legitimate reserve asset.

The same process happened with gold. With emerging market equities. With every asset class that went from “fringe” to “mainstream.”

Seasonal patterns are a sign of maturity. And maturity is the road to $1 million.

Nothing in this article is financial advice. All historical patterns are descriptive, not predictive. Consult a qualified financial advisor for personalized guidance.