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What happens when all 21 million bitcoin are mined?

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SoloLuck Blog · 2026-06-30

The hard cap of 21 million

Bitcoin will only ever have 21 million coins — a limit baked into the code from day one. New coins enter only as block rewards, and because that reward halves every four years, the flow of new supply shrinks toward zero on a known schedule. We're already past 19.8 million mined.

When is the last coin mined?

Around the year 2140. The halvings make each new batch of coins smaller and smaller until the reward rounds below the smallest unit (a satoshi, one hundred-millionth of a bitcoin) and effectively reaches zero. The very last whole coins are released agonizingly slowly in the final decades — but the practical scarcity is felt long before then.

How miners get paid after that

Miners are paid two ways: the block subsidy (new coins) and transaction fees (paid by users to get included). As the subsidy fades, fees become the whole reward. The idea is that by 2140 Bitcoin handles enough valuable transactions that fees alone fund the security. Today fees are usually a small slice; over time they're designed to take over.

Will mining still be worth it?

That's the long-term question. As long as people value moving and settling bitcoin, they'll pay fees to do it, and miners will compete for those fees exactly as they compete for the subsidy now. The same proof-of-work, the same lottery — just funded by fees instead of fresh coins. For a solo miner, a block you find will simply pay you its fees instead of new coins.

Why the cap is the whole point

Unlike money a government can print at will, no one can ever create a 21,000,001st bitcoin. That fixed, predictable, unforgeable scarcity is exactly what gives bitcoin its character as "hard money." The day the last coin is mined isn't a cliff — it's the moment the experiment fully arrives at what it was always designed to be.

FAQ

How many bitcoin are left to mine?
Out of 21 million total, more than 19.8 million have already been mined. The rest trickle out slowly, with the final coins not arriving until around 2140.
When will the last bitcoin be mined?
Approximately the year 2140, when the halving-driven block reward rounds below one satoshi and effectively reaches zero.
How will miners be paid when there are no new coins?
Entirely through transaction fees paid by users. As the new-coin subsidy shrinks, fees are designed to become the miners' whole reward.
Can the 21 million limit ever change?
Only if a supermajority of the network agreed to change the rules — which is considered politically and economically impossible, since the fixed supply is Bitcoin's core value proposition.

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