For a family of significant wealth, crypto has become an ordinary asset class with its own infrastructure: custodians, banks, OTC desks, auditors. It is managed under the same rules as a securities portfolio or real estate, except that the price of an operational mistake is higher — a lost key cannot be recovered, and an account frozen by compliance is not quickly unfrozen either.
The era of anonymity has ended in parallel. The OECD extended automatic exchange of tax information to crypto-assets: the first exchanges under the CARF standard take place in 2027. The EU built a single authorisation regime for providers under MiCA, Hong Kong and Singapore closed their own regimes, and the United States passed its first federal statute on stablecoins. In the theory of five flags the digital flag survives, but its content has changed: it is now a choice of provider jurisdiction, custody quality, and reporting discipline.
Section map: which question to start with and where the answer is.
| Reader's question | Page |
|---|---|
| Who holds the keys and what happens on a hack | Family cybersecurity |
| Which bank will accept funds of crypto origin | AMINA |
| What happens to the coins when a venue collapses | UK cryptoasset safeguarding |
| Which jurisdiction for the exchange and the custodian | Crypto jurisdictions overview |
| Where the tax on gains is lower | Crypto tax by country |
| What the tax authority learns automatically, and when | CARF in practice |
| Whether a trust or a fund is needed | Trust basics |
| How to pass access to the heirs | Succession planning |
| Where to hold settlement balances | Stablecoins |
| How to sell a large position without moving the price | OTC desks |
Concept
Crypto in private wealth comes down to five decisions.
- Custody: who controls the private keys and what happens on a hack, a custodian insolvency, or the owner's death.
- Banking: which bank will accept funds of crypto origin and on what file.
- Regulatory perimeter: in which jurisdictions the exchange, the custodian, and the OTC desk sit.
- Tax: which events are taxable and where the holder's residency delivers a favourable regime.
- Succession: how access to the assets outlives the owner.
The decisions are interlocked: the choice of custodian shapes the banking options, the provider's jurisdiction determines where reporting goes, and the ownership structure governs what heirs receive and in what order.
Custody: the full spectrum
At one end sits self-custody: the keys are with the owner. For amounts that would hurt to lose, a single seed phrase in a safe has long counted as poor practice. The standard is multisig, where a transaction requires, say, two signatures out of three with keys distributed across people and locations, or MPC: cryptographic splitting of the key into shares such that the complete key never exists on any single device. Institutional MPC infrastructure comes from platforms such as Fireblocks; a family's operational security is covered in a separate piece.
At the other end sit qualified custodians: regulated holders with client-asset segregation, audit, and insurance cover. The US segment is represented by Coinbase Prime with its NYDFS-supervised trust company and Anchorage Digital with a federal OCC bank charter; the European one by Swiss Sygnum with a FINMA banking licence; the Asian one by Hong Kong's HashKey with SFC licences. For trusts and funds an independent custodian is usually mandatory: a fiduciary may not keep client keys on its own laptop.
Between the two ends sit banks that have added crypto custody and execution to classic private banking: digital assets appear on the same statement as the securities portfolio. The review of Morgan Stanley's crypto offering shows how the large houses are building the service out; niche players such as FV Bank combine account, cards, and custody in a single onboarding.
Banking: source of funds
The weak link in any crypto strategy is the fiat account. A sale on a regulated exchange guarantees nothing by itself: the proceeds must be accepted by a bank whose compliance function is prepared to work with crypto origin, and most classic private banks still decline. The specialist segment consists of Swiss banks AMINA and Sygnum, built around digital assets and reading on-chain history as a matter of routine; part of the flow is handled by EMIs — payment institutions with crypto-tolerant onboarding, but without a banking licence and without deposit protection.
The decisive document at the gate is proof of source of funds and proof of source of wealth. For crypto that means addresses and transaction hashes, exchange statements going back years, contracts for the original purchases, and tax returns where the income has already been declared. The bank will run the addresses through blockchain forensics, and the declared history must reconcile with the on-chain data: gaps in the chain have to be explained with documents. The longer the asset lived in self-custody, the harder the file is to assemble, so the evidence pack is prepared in advance, before onboarding.
The holder's regulatory map
Licences are held by the provider, but it is the holder who picks it, and the provider's jurisdiction settles three questions: which law protects the assets on its insolvency, which regulator to complain to, and which tax authority the reporting reaches.
| Jurisdiction | Regime | For the holder |
|---|---|---|
| EU | MiCA: crypto-asset services only from authorised CASPs | The transitional period for venues on national regimes expired on 1 July 2026: ESMA required wind-down and an end to serving clients in the Union |
| United Kingdom | Its own FCA regime | The cryptoasset safeguarding rules decide the fate of client coins when a venue collapses |
| Hong Kong | SFC licensing for trading platforms | From 1 August 2025 a regime for stablecoin issuers supervised by the HKMA applies |
| Singapore | Payment Services Act for digital payment token services | From 30 June 2025 the DTSP regime requires a licence even from firms serving only foreign customers; MAS says it will generally not issue it |
| United States | A patchwork of state licences headed by the NYDFS BitLicense | No single federal regime for providers; federal statute so far covers stablecoins only |
| Kazakhstan | Crypto licensing through the AIFC | A working example on the post-Soviet track: the jurisdiction sits in the first CARF exchange group of 2027 |
A comparison of jurisdictions against a holder's objectives is in the crypto jurisdictions overview.
Tax: events and favourable jurisdictions
In most systems crypto is characterised as property for tax purposes. A taxable event arises on a sale for fiat, on a token-for-token swap, on paying for goods, and often on receiving staking rewards and airdrops. Buying with fiat and moving between one's own wallets generally create no event but still require records: without a fixed acquisition cost, any future disposal turns into a dispute over the tax base.
Which country may tax is decided by the owner's tax residency, and the spread between jurisdictions remains wide.
| Jurisdiction | Capital gains | When tax arises |
|---|---|---|
| Singapore | Not taxed | Only where the transactions, taken together under the badges of trade, amount to trading |
| Hong Kong | Outside profits tax | Only trading profits with a Hong Kong source are charged |
| The UAE | No income tax on individuals | Only systematic business activity can fall within corporate tax |
Rates and characterisation across the rest of the world are collected in the country tax comparison.
CARF: the transparency timetable
Residency and disposals are worth planning against what tax authorities will see on their own. CARF is the OECD standard for automatic exchange of information on crypto-assets: exchanges, custodians, and brokers report client and transaction data to each client's country of tax residence, mirroring the mechanics of CRS for bank accounts. Under the Global Forum commitment list (updated 23 June 2026), 76 jurisdictions have committed. The timetable for first exchanges splits into three groups.
| Group | First exchanges | Example jurisdictions |
|---|---|---|
| 46 jurisdictions | by 2027 | 26 of the 27 EU member states (via DAC8; Cyprus sits in the 2028 group), the United Kingdom, Cayman Islands, Jersey, Guernsey, Isle of Man, Brazil, Japan, Korea, Kazakhstan |
| 29 jurisdictions | 2028 | Switzerland, the UAE, Singapore, Hong Kong, Türkiye, Canada, Australia, BVI, Bermuda, the Bahamas |
| United States | 2029 | A separate commitment; the implementation route is not finalised |
The data is already being collected: jurisdictions in the 2027 group required providers to record transactions from the start of 2026, and in the United Kingdom, for instance, the first report for 2026 goes to HMRC by 31 May 2027 — with penalties of up to £300 for each user whose data is missing or inaccurate.
Structures: personal, trust, fund
Personal ownership remains the default: minimum cost, a clean tax picture. A structure is justified for succession, asset protection, joint ownership, or institutional access; as a tool for concealment it is useless — the beneficial owner is disclosed under UBO rules, and without real economic substance both the tax authority and the bank will look straight through the arrangement.
A trust holding crypto faces a specific problem: custody on the trustee's side. A trustee carries a fiduciary duty to safeguard the trust property, yet professional trust companies are not prepared to hold private keys themselves. Practice has produced three answers.
- An account with a qualified custodian opened in the name of the trust.
- A private trust company into which custody competence is hired.
- Delegation of investment management to a specialist manager with assets held by an independent custodian.
Key authority and liability for a compromise are written into the trust deed as a separate section — otherwise a dispute over who was responsible for the hack is guaranteed.
Families that trade actively or bring in outside co-investors wrap the position into a fund: an administrator, an auditor, and an independent custodian turn a set of wallets into verifiable NAV reporting that banks and tax authorities understand. Running costs exceed those of a trust, but institutional access opens up — prime brokerage, lending against the position, subscriptions from external investors.
Key succession
A private key known only to its owner makes the asset permanently inaccessible after death: a will transfers the right, but a right without the key is worth nothing. A succession protocol is assembled from three parts.
- The technical part is multisig or MPC with shares distributed among heirs, trusted persons, and a custodian; this also covers the dead man's switch — a mechanism that releases access automatically after a long period of owner inactivity, useful as a backstop and carrying no legal force of its own.
- The documentary part consists of sealed access instructions held by a notary or trustee, stored separately from the will: during probate the will becomes a public document, and a seed phrase has no place in its text.
- The organisational part is a succession plan in which the executor knows the digital assets exist and the heirs know whom to approach for access.
Rehearsing recovery during the owner's lifetime exposes gaps in the protocol far more cheaply than a probate file does.
Stablecoins in the family treasury
Stablecoins serve a family treasury as settlement cash: transfers between jurisdictions in minutes, parking proceeds between deals, denominating obligations in dollar equivalent without opening an account in every country. In exchange, the holder takes on the issuer's credit risk and the quality of its reserves.
Regulation has shifted the choice towards licensed instruments. In the EU, MiCA governs the issuance of e-money tokens; in the United States the GENIUS Act — signed on 18 July 2025 as Public Law 119-27 — admits only approved issuers with segregated reserves to payment stablecoin issuance and leaves the tokens outside federal deposit insurance; in Hong Kong the HKMA licenses issuers. An issuer for treasury balances is picked on the law of issue, reserve composition, and audit; long-term savings are not held in stablecoins.
Exiting into fiat
A large sale through an exchange order book moves the price and fragments into dozens of fills. Positions in six figures and above are sold through an OTC desk: the price is fixed before the trade, settlement runs as a single transfer, and the KYC file is agreed in advance. The proceeds are received by a bank already familiar with the source-of-funds file — a specialist crypto bank or a classic private bank with the evidence pack assembled. Readiness on each side matters more than speed here: settling into an unprepared account ends in a freeze.
Risks
The crypto-specific risks for a holder concentrate in five places.
Q/A
A wallet in self-custody — surely nobody knows about it?
The exchange the coins came from does, and so does blockchain forensics. Under CARF, providers report client and transaction data to the country of tax residence, and a transfer out to an external address appears in that reporting. In the EU, above €1,000 the venue additionally verifies whether the self-hosted address is owned or controlled by its own client. Anonymity ends at the first contact with regulated infrastructure.
What happens to the crypto if I was the only one who knew the seed phrase?
After the owner's death the asset becomes permanently inaccessible: a private key cannot be reconstructed and a will is no substitute for it. Access is moved into a succession protocol in advance — multisig with distributed keys, sealed instructions with a notary or trustee, a qualified custodian with a documented succession procedure.
I swapped one coin for another without cashing out — is there a tax?
In most jurisdictions, yes: a token-for-token swap is a taxable event on a par with a sale for fiat. Residency sets the exceptions: Singapore and Hong Kong do not tax capital gains, and the UAE levies no income tax on individuals. The characterisation as capital or trading is made by the tax authority, and active trading changes the answer.
A bank wants proof of origin for crypto bought ten years ago. What do I show?
Everything that reconstructs the history: exchange statements and trade reports (for defunct venues, archived emails and exports), transaction hashes and addresses, purchase contracts, tax returns where the income was declared. Compliance will reconcile the account with blockchain forensics, so gaps in the on-chain chain are closed with documents. The file is prepared before onboarding: once compliance has asked its questions, time works against the client.
Does moving to the UAE or Singapore wipe out tax on accumulated gains?
Not automatically. What matters is the moment the previous residency is lost, the exit tax of the departure country, and any trailing-tie rules. A disposal after a properly executed change of residency to a jurisdiction without capital gains tax may indeed be untaxed, but gains realised before the move stay in the old perimeter, and a dense series of disposals around the move date is a classic audit target.
Will a trustee agree to hold crypto in trust?
Professional trustees increasingly accept digital assets, but on their own terms: custody with a qualified custodian in the name of the trust, origin forensics at the gate, key authority and liability spelled out in the trust deed. Refusal is likely where the settlor insists on self-custody: personal control of keys by the settlor undermines both the fiduciary logic and the protective function of the trust.