Turn the halving question into a precise schedule
“What did regular Bitcoin purchases before the halving earn?” needs a starting month, purchase day and valuation endpoint. Here the plan contributes $100 on the first day of each month from 1 April 2023 through 1 March 2024. That is twelve contributions and $1,200. There is no April 2024 purchase. The date 20 April 2024 serves only as the valuation endpoint, preventing an accidental thirteenth contribution from entering the calculation.
Prices are observed Yahoo Finance BTC-USD daily closes rather than invented market quotes. The investment itself is hypothetical: each $100 purchases fractional Bitcoin, no selling occurs, and commissions, taxes and transfer costs are zero. The snapshot was captured on 14 September 2026, but the last valuation price remains fixed at 20 April 2024. This article does not report today's portfolio value or forecast the return around a future halving.
A protocol event is not a price guarantee
Bitcoin.org's halving history records the fourth event on 20 April 2024 at block 840,000, reducing the new block subsidy from 6.25 to 3.125 BTC. The schedule is linked to intervals of 210,000 blocks rather than a precisely predetermined calendar hour. It changes new issuance, not a rule requiring Bitcoin's market price to increase by a particular percentage that day or over the following months.
A rise around an event does not establish that the event caused the entire movement. Demand, conditions in other markets and investor behavior can change simultaneously. This calculation does not construct a control group to separate those influences. It applies a disclosed purchase schedule to recorded observations. “An event happened and prices later rose” is not a causal test. The useful output is a reproducible scenario around the event, with its limitations intact.
The complete twelve-purchase ledger
Each quantity equals $100 divided by that day's close. Prices are displayed to two decimals and quantities to eight, while totals use source precision rather than rounded table values. Bitcoin trades throughout the week, so the example does not move a weekend first-of-month date to a stock-market trading day. Nevertheless, exchanges can use different daily cutoffs and execution prices. A provider's close is an observation, not an individual transaction receipt.
| Purchase date | USD/BTC | Contribution USD | BTC |
|---|---|---|---|
| 2023-04-01 | 28,411.04 | 100 | 0.00351976 |
| 2023-05-01 | 28,091.57 | 100 | 0.00355979 |
| 2023-06-01 | 26,819.97 | 100 | 0.00372856 |
| 2023-07-01 | 30,590.08 | 100 | 0.00326903 |
| 2023-08-01 | 29,675.73 | 100 | 0.00336976 |
| 2023-09-01 | 25,800.72 | 100 | 0.00387586 |
| 2023-10-01 | 27,983.75 | 100 | 0.00357350 |
| 2023-11-01 | 35,437.25 | 100 | 0.00282189 |
| 2023-12-01 | 38,688.75 | 100 | 0.00258473 |
| 2024-01-01 | 44,167.33 | 100 | 0.00226412 |
| 2024-02-01 | 43,075.77 | 100 | 0.00232149 |
| 2024-03-01 | 62,440.63 | 100 | 0.00160152 |
Total quantity is approximately 0.03649001 BTC. At the 20 April 2024 close of $64,994.44140625, it is worth $2,371.65. The difference from contributions is $1,171.65, or 97.64% of contributions before costs. This percentage is not annualized. Payments entered at different dates, so they did not all spend a full year invested. The return label should preserve that distinction.
A single $1,200 purchase is a different schedule
If all $1,200 had been invested at the 1 April 2023 close, the same endpoint would produce $2,745.18. That uses the same budget but a different amount of time in the market. Whether it was an available choice depends on whether the investor possessed the whole budget initially. Money saved from future salary could not have been invested in advance. The comparison shows two mathematical schedules, not two equally feasible choices for everyone.
The single purchase's higher outcome in this period does not establish superiority for every period. Regular purchasing does not identify the future lowest price; it links transactions to a calendar. The same contribution buys more Bitcoin when the price is lower and less when it is higher. The final value still depends on the price applied to the accumulated quantity. Building quantity and achieving a profitable ending value are related but distinct parts of the calculation.
Stress the valuation rather than projecting the winner
Valuing the accumulated quantity at a hypothetical $30,000 would produce $1,094.70. That price is a sensitivity input, not an observation assigned to a historical day. The identical purchase schedule and Bitcoin quantity can generate a different gain or loss under another ending price. A calendar rule cannot eliminate that exposure. Selecting the favorable observed endpoint does not change the underlying dependence on final valuation.
A broader study would systematically vary entry months and holding windows rather than publish only the best outcome. This article has not tested every earlier halving with the same method. It therefore reports no success rate, average halving return or probability for the next cycle. A small set of events cannot support an automatic universal market rule. The measured finding is limited to these twelve purchases valued at the specified ending observation.
Costs and custody remain outside the price ledger
If a fee were deducted from each contribution, less money would purchase Bitcoin. If fees were paid separately, the total cash budget would exceed $1,200. Those approaches require different return denominators. A network transfer fee is also different from an exchange trading commission. When reconciling a real account, specify when each cost occurred and where it was funded. Otherwise a smaller quantity can be wrongly attributed to a disagreement about historical prices.
Retaining access to the accumulated holding is another assumption. Wallet or service-provider problems can separate quoted market value from usable assets. The article does not choose a custody service; it explains that a price series does not measure operational access. A high calculated balance is not proof that every past transaction would have completed without difficulty or that access will remain secure. An investment-price scenario is not an operational guarantee.
Match the endpoint when using a live calculator
In the DCA calculator, Bitcoin, monthly frequency, $100 and an April 2023 start create a similar schedule. Ending contributions in March 2024 is not the same as fixing valuation to April 2024. The live flow can value the remaining quantity today. To check this article's result, use both the accumulated quantity and the fixed 20 April close. Distinguish these dates before treating every different output as an arithmetic defect.
The halving provides a narrative, but purchase dates, prices and quantities provide the audit trail. Saving them prevents a changing live screen from being mistaken for the original fixed result years later. With the same source rows, arithmetic is reproducible; if the provider revises history, the difference can be investigated. The outcome belongs to one past scenario. It is not an instruction to invest before another halving and does not promise the same return.
