What Happens When All 21 Million Bitcoin Are Mined?

The 21 Million Question

Bitcoin has a hard cap of 21 million coins. Currently, about 19.8 million have been mined — roughly 94%. The remaining 6% will trickle out over the next 114 years, with the final fraction mined around 2140.

If miners earn Bitcoin as a reward for securing the network, what happens when there is no more Bitcoin to give them?

How Mining Rewards Work Today

Miners earn from two sources: the block reward (currently 3.125 BTC per block) and transaction fees paid by senders. Today, fees account for 5-15% of miner revenue.

The Gradual Transition

The shift from block rewards to fees is not sudden — it is a 130-year gradual transition already underway. By 2040, the block reward will be less than 0.2 BTC. Long before the last Bitcoin is mined, fees will be the dominant revenue source.

Will Transaction Fees Be Enough?

Strong reasons to believe yes: growing transaction volume means more total fees per block. Lightning Network channels must open and close on-chain, creating high-value settlement transactions. And if Bitcoin price appreciates, the fiat value of small fees grows proportionally.

What If Fees Are Not Enough?

The difficulty adjustment self-regulates: if miners leave, difficulty drops, costs decrease for remaining miners, and profitability is restored. Bitcoin does not need the current hash rate to be secure — even significant reduction would still make attacks extraordinarily expensive.

Most importantly, the community has over a century to develop solutions if needed.

The Bigger Picture

The 21 million cap is not a flaw — it is the entire point. If the cap could be raised to fund mining, Bitcoin would lose the property that makes it valuable. The transition to fee-based security is the most important long-term experiment in Bitcoin design. So far, every indication suggests it is working as Satoshi anticipated.

Learn more in our How New Bitcoin Are Created module.