The Last 1 Million Bitcoins: Bitcoin's Final Chapter

1When Will the Last Bitcoin Be Mined?

The final bitcoin subsidy is expected to be issued around the year 2140, not when the network reaches 21 million coins in the next few years. Bitcoin's block subsidy is cut in half every 210,000 blocks. Because each era issues only half as much as the one before it, the remaining supply arrives in a long mathematical tail.

At block 973,514 on October 28, 2026, the protocol schedule had made up to about 20,104,734.375 BTC available through block subsidies, leaving about 895,265.602 BTC in the remaining schedule. These are protocol-schedule figures, not an estimate of liquid or spendable supply. The genesis block subsidy cannot be spent, some historical blocks claimed less than the maximum reward, and lost private keys remove additional coins from practical circulation.

2How Bitcoin's Supply Schedule Works

Bitcoin began with a 50 BTC subsidy per block. The consensus rules reduce that subsidy after every 210,000 blocks: 50 BTC became 25, then 12.5, 6.25, and finally 3.125 BTC after the 2024 halving. The next halving begins at block 1,050,000, when the subsidy drops to 1.5625 BTC.

The rule is implemented in node software, and each fully validating node independently rejects blocks that create more subsidy than the schedule allows. This is why the cap is not a promise from a company or miner. It is a rule participants choose to validate. The mining rewards guide explains how subsidy and transaction fees combine into the block reward.

The familiar 21 million figure is approximate. Integer satoshi rounding makes the maximum scheduled total slightly lower: about 20,999,999.9769 BTC. Actual spendable supply is lower still because the genesis subsidy is unspendable, some rewards were underclaimed, and an unknown amount of bitcoin has been lost.

3Bitcoin Supply Snapshot: October 28, 2026

The following snapshot uses the Mempool Space chain tip and applies Bitcoin's subsidy formula through that height. It is designed to answer current search questions without pretending the estimate is permanent.

4Why the Final Million Takes More Than a Century

The final million does not arrive at today's issuance rate. Every halving cuts the subsidy in half, so each future era contributes less than the previous one. At an average ten-minute block interval, the next halving is estimated around April 2028, but the date will move as real block production runs faster or slower than the target.

This geometric decline explains why more than 95.74% of the scheduled supply is already behind us while the remaining issuance extends for roughly another century. For the relationship between halvings, emissions, and mining ROI, see the halving and emissions research guide.

5Circulating Supply Is Not Effective Supply

Circulating supply counts coins that have been mined. Effective supply asks how many coins can realistically trade. The 50 BTC genesis subsidy is unspendable. Other coins were sent to provably unspendable scripts, lost with private keys, or held for years in cold storage. None of these categories should be added back to the future subsidy schedule.

On-chain research often separates long-term and short-term holder supply because recently moved coins tend to behave differently from dormant balances. That distinction matters for liquidity, but it does not change the consensus cap. Scarcity can constrain supply without guaranteeing any particular price outcome.

The safest language is therefore precise: about 895,266 BTC remained in the scheduled subsidy after the snapshot block, while the amount available for sale was smaller and impossible to measure exactly.

6What the Final Million Means for Miners

For miners, the final million is a gradual revenue transition. The current reward is the 3.125 BTC subsidy plus transaction fees. Across the latest 144 blocks in this snapshot, miners received about 452.15 BTC in total rewards, including about 2.15 BTC in fees. Fees represented roughly 0.48% of that short sample, but fee share can change sharply with block-space demand.

Each halving reduces the predictable subsidy cushion. That raises the importance of ASIC efficiency, electricity contracts, uptime, pool fees, repair capability, treasury policy, and the market value of block-space fees. The Bitcoin electricity cost guide and hashrate guide show why the same subsidy can produce very different business results for two operators.

A pool changes payout variance, not the underlying supply schedule. Solo miners can wait years or decades for a block, while pools distribute smaller rewards more regularly. Compare those tradeoffs in the solo mining versus pool mining guide. For a machine-scale estimate, the how long it takes to mine one bitcoin analysis provides worked examples.

7What Happens After the Last Satoshi Is Mined?

Bitcoin should not stop producing blocks when the subsidy reaches zero. Valid transactions will still pay fees, miners will still compete to create blocks, and nodes will still verify the same consensus rules. What changes is the composition of miner revenue: subsidy plus fees becomes fees only.

The year 2140 is an approximation based on the average block interval. It is not a shutdown date, and it is not the date every bitcoin becomes available. By then, almost all scheduled supply will have been issued for decades, and mining economics will have passed through many smaller subsidy eras.

Layer 2 systems may move many small payments away from the base chain, while higher-value settlement, exchange flows, channel operations, and other uses continue competing for block space. Whether that fee market supports sufficient security is an economic question, not something the supply formula alone can guarantee.

8The Fee-Only Security Budget: What We Know and What We Do Not

Bitcoin's long-term design assumes transaction fees can motivate miners after subsidy issuance ends. The direction is clear, but the future equilibrium is not. Fee revenue depends on user demand for scarce block space, while mining cost depends on energy, hardware efficiency, financing, regulation, and competition.

This uncertainty does not mean mining automatically fails after 2140. It means claims about a guaranteed fee market, a guaranteed hash rate, or a guaranteed Bitcoin price go beyond what the protocol can promise. Current operators should model the next halving and current costs rather than make business decisions around a date more than a century away.

9Practical Implications for Miners and Holders

• Use a dated supply snapshot. Block height is more precise than quoting a static circulating-supply number without a date.
• Separate subsidy from total reward. Transaction fees are additional and vary from block to block.
• Do not treat scarcity as a price forecast. Demand, liquidity, leverage, regulation, and macro conditions still matter.
• Model the next halving, not only 2140. The 2028 reward cut is far more relevant to current ASIC economics.
• Protect custody. Lost keys reduce practical supply but do not increase the protocol cap or create replacement coins.

Miners planning current operations can use the Bitcoin mining guide for hardware, software, pool, and calculator choices. For market-risk boundaries, use the Bitcoin price volatility and miner profitability analysis.

10Frequently Asked Questions