The trillion-dollar inheritance problem
Chainalysis estimates that 20% of all Bitcoin ever mined is permanently lost — about 3.7 million BTC, worth over $240 billion at current prices. Most of that loss happened for two reasons: owners lost their seed phrase, or owners died without transferring access to heirs. Crypto has no password reset, no bank to call, no probate court that can compel a private key. If your heirs cannot find the seed phrase in a form they can use, your crypto is as good as burned.
This calculator projects what your portfolio will be worth when it transfers to your heirs and subtracts the expected loss based on your inheritance plan quality. The default assumes a 35% loss rate — the observed rate for crypto estates without a documented plan. With a proper plan, that drops to near zero.
Why crypto inheritance is harder than traditional estate planning
A traditional estate has a paper trail: brokerage accounts, deeds, will filings. A crypto estate is just numbers in a wallet that nobody can see without the seed. If you store BTC on a Ledger in a safe and die without telling anyone the PIN or showing them the seed backup, your heirs will inherit the Ledger but not the Bitcoin. Probate court cannot help. Apple cannot reset your Ledger. The coins stay on-chain forever, visible but inaccessible.
The four components of a real inheritance plan
A complete crypto inheritance plan has four parts: (1) a written inventory of what crypto you hold and where it's custodied, updated at least yearly; (2) access instructions for each custody method — exchange login + death certificate protocol, hardware wallet PIN, seed phrase location; (3) legal documentation in your will or trust referencing the inventory without listing private keys in the will itself (which becomes public); (4) at least one trusted party who knows the plan exists and how to execute it. Missing any of these and the plan fails.
Self-custody inheritance: Shamir, multi-sig, timelock
The three best technical solutions are Shamir Secret Sharing, multi-signature wallets, and timelocked transactions. Shamir splits your seed into N pieces where any M can reconstruct (e.g. 3-of-5). Multi-sig requires M of N hardware wallets to co-sign; one key to you, one to a lawyer, one to an heir. Timelock contracts (like Bitcoin OP_CHECKLOCKTIMEVERIFY) let you pre-sign a transaction that becomes spendable only after N blocks — effectively a dead-man switch. Services like Casa and Unchained bundle these into managed inheritance products for $300-1,000/year.
Exchange custody: simpler but not automatic
Crypto held on Coinbase, Kraken, or Gemini can be claimed through the standard exchange death-of-account process. Heirs provide a death certificate, Letters Testamentary, and government ID. The exchange transfers the balance to the estate's bank account or a new account in the heir's name. This is the cleanest path for inheritance — but it only works if your heirs know which exchanges you used. Leave a list.
Tax treatment: step-up basis is huge
Under current US tax law, crypto inherited at death gets a stepped-up cost basis equal to fair market value on the date of death. If you bought Bitcoin at $1,000 and die when it's $100,000, your heirs' basis is $100,000. They pay no capital gains on the $99,000 of appreciation. This is the single most valuable tax feature of crypto estate planning. Use our crypto inheritance tax calculator to model the full tax treatment.
Sizing the plan to the portfolio
For crypto portfolios under $50k, a simple plan — exchange custody with a clear inventory letter to your spouse or executor — is enough. For portfolios $50k-$500k, consider a Shamir split with two trusted parties plus a safe deposit box. For portfolios $500k+, use a professional service (Casa, Unchained, Nic Carter's inheritance templates) or set up a proper multi-sig trust. The plan complexity should match the stakes. Our crypto retirement calculator shows how big the portfolio becomes.
Update annually
Crypto custody changes. You'll move coins to a new wallet, add a new exchange, sell some tokens. An inheritance plan written 5 years ago probably lists wallets that no longer hold anything and misses wallets that hold most of your portfolio. Review the inventory every January. Confirm the trusted-party contacts are still alive and reachable. Test the seed-phrase recovery path with a small amount. A plan that isn't updated is a plan that will fail.