Hardware wallet lost: how to rescue your coins and what the tax office accepts

If your hardware wallet is gone, your coins are almost never gone. Your holdings are still on the blockchain, exactly where they always were. The device never stored them; it only kept the keys you use to dispose of them. That is why a single question decides everything: do you still have your recovery phrase?

If the answer is yes, the rest is routine and done in half an hour. If it is no, the second and more uncomfortable question arises, and this article is mainly about that one: can you at least write the loss off against tax? The short answer for investors in Germany, under current administrative practice, is no. A lost key is not a sale, and without a sale German income tax law recognises no deductible loss on crypto-assets held privately. There are counter-arguments, they deserve to be taken seriously, and they appear further down. Do not rely on them.

This article takes you through both halves of the problem: first the technical rescue, then the tax position along with the evidence you need for it.

Hardware wallet lost: why the device is not your coins

A hardware wallet is a small device that generates and stores your private keys offline and signs transactions without ever handing the key to the computer. The private key is the secret number that allows a transaction to be signed with legal effect. Whoever holds it controls the coins. Whoever does not hold it can watch, but move nothing.

The holdings themselves sit in the public ledger of the blockchain concerned. With Bitcoin you can look up your address in any block explorer and see your balance still standing there while the device lies in a moving box or at the bottom of a lake. That is precisely why a lost device is, as a rule, not a financial loss.

Financial loss only arises once nobody can reconstruct the key any more. And the key does not sit in the device; it sits in your backup.

Recovery phrase to hand? How to restore your wallet under the BIP39 standard

The recovery phrase, often also called the seed phrase, is a sequence of usually twelve or twenty-four words from which all the private keys of a wallet can be recalculated. The underlying standard is called BIP39 and comes from the Bitcoin ecosystem, but almost every common device and software wallet supports it. The words come from a fixed list of 2,048 terms, which is why a single typo stands out and can often still be corrected.

The restore procedure is always the same. You obtain a new device or a reputable software wallet, choose the restore option during setup instead of the option for a new wallet, type your words in the correct order and wait until the wallet has synchronised with the chain. Your balance is then back.

Two points are non-negotiable here. First, you enter the words only on a device you trust, never on a website and never in a support chat. Second, you are not tied to the manufacturer of the lost device: the standard is open, and a phrase created under BIP39 can as a rule also be loaded at another provider. We have described the pitfalls involved in detail in our guide to restoring a seed phrase with a different manufacturer. If you need a new device anyway while you are at it, our hardware wallet comparison will help you choose.

Passphrase, Shamir backup and derivation path: why a restore fails despite the phrase

When the words are right and an empty account still appears, one of three technical peculiarities is almost always behind it.

The passphrase is a self-chosen additional word that some devices offer as a twenty-fifth word. That additional word turns the same sequence of words into a completely different wallet. Anyone who set a passphrase and later forgot it faces an empty balance despite a complete phrase, because there is no recovery for that one word.

The Shamir backup, standardised technically as SLIP39, splits the backup into several parts, of which a defined minimum number has to be brought together. Anyone who finds only one part has precisely nothing. Such fragments also cannot be typed into a device that only understands BIP39.

The derivation path, finally, is the calculation rule by which the individual addresses are derived from the phrase. Different wallets use different defaults. If an empty account appears after a restore, it is worth looking into the advanced settings before panic breaks out: the balance is frequently on a different path of the same phrase.

Only once phrase, passphrase and path have been exhausted is access really lost. From that point on, a technical problem becomes a tax problem.

Why Section 23 of the Income Tax Act sees no disposal in a lost key

Crypto-assets held privately belong to the category of so-called other assets. Under Section 23(1) sentence 1 no. 2 of the German Income Tax Act, a private disposal transaction is one in which no more than a year lies between acquisition and disposal. The Federal Fiscal Court confirmed this classification in its judgment of February 14, 2023 under case number IX R 3/22 and declared gains from the sale and the exchange of currency tokens within the one-year period taxable.

That very classification works against you in the event of a loss. The statute attaches to a disposal, that is, to a transaction in which an asset changes owner for consideration. A device that ended up in household waste changes nothing. There is no acquirer, no disposal price and therefore, on the wording of the provision, no gain and no loss. The same applies to theft: there, too, a disposal transaction is missing, which is why tax offices regularly refuse to recognise such losses.

This is the position you have to prepare for. It is unsatisfactory, because gains in the same window are very much taxed. It nevertheless remains the starting point of any realistic planning.

The one-year period of Section 23 also decides the fate of your loss

The one-year holding period works in both directions. Anyone who held their coins for longer than a year pays no income tax on the gain. Read the other way round, the same sentence means that a loss is worthless for tax purposes once that period has expired, even if it hurts economically.

For your case this means: lost access can only become relevant for tax at all if less than a year lies between the purchase of the coins and the moment access was finally gone. With a device that sat in a cupboard for years, the question is usually answered before it is asked.

One widespread worry can be crossed off at this point. The extension of the disposal period to ten years, which the statute provides for assets generating ongoing income, does not apply to crypto-assets in the view of the tax authorities; the current letter from the Federal Ministry of Finance devotes its own section to this point, headed "Keine Verlängerung der Veräußerungsfrist auf zehn Jahre", no extension of the disposal period to ten years. So anyone who staked or lent stays with the one-year period.

What tax lawyers argue in favour of recognising the loss

The legal position is less clear-cut than the wording of the statute sounds, because an express rule for crypto-assets that have gone missing is still absent today. In a specialist article of March 10, 2025, written by Malika May, the WINHELLER law firm collected several arguments in favour of taking such losses into account for tax purposes.

The first is an analogy to the case law on shares: the Federal Fiscal Court has recognised the uncompensated withdrawal of shares following a capital reduction to zero for tax purposes, and both cases concern privately held assets that perish through no fault of the owner. The second is the principle of taxation according to economic capacity, from which it is hard to justify why gains are taxed while losses are ignored. The third is the risks inherent in trading crypto-assets, from attacks on wallets to the technical loss of access credentials.

The same source openly names the limit of that argument: recognising losses that only materialise after the one-year period has expired is likely to be hard to justify. The counter-position, which dominates the practice of the tax offices, remains the simpler one: no disposal transaction, no loss.

In practical terms this means that your case will, in case of doubt, only get anywhere with an appeal and with professional support. Expect resistance, budget for the effort, and treat recognition as a possibility rather than as a tax saving you have already banked.

Realise the loss instead of hoping: what a sale at token amounts achieves

For holdings that have become worthless but are still accessible there is a viable route: anyone who actually disposes of the coins, even at a symbolic price, thereby creates the transaction the statute requires. We have worked through in detail how that functions with delisting, worthless tokens and an insolvent exchange in our guide to writing off a total crypto loss.

That route is precisely what a lost key closes off, and therein lies the decisive difference between the two groups of cases. You cannot sell what you cannot sign. Anyone offering to unlock "blocked" coins against an advance payment, or to buy them from you without ever gaining access, is running a well-known scam. Do not transfer money to recovery services in this situation.

If access to part of your holdings remains intact, a sober calculation across the whole tax year is worthwhile. Realised losses from other positions can reduce gains from private disposal transactions in the same year, and that effect is often larger than the prospect of eventually having the lost key recognised.

Duty to provide evidence: what you have to document after the Ministry letter of March 6, 2025

On March 6, 2025 the Federal Ministry of Finance published a revised letter on individual questions on the income tax treatment of certain crypto-assets, file reference IV C 1 - S 2256/00042/064. New compared with the previous version is a main section of its own on tax return, cooperation and record-keeping obligations, with a subsection on the cooperation and retention obligations for privately held assets as well as separate sections on wallets, keys and transactions, on transaction overviews and on tax reports.

The thrust of those sections is unambiguous: anyone declaring income from crypto-assets must be able to document the path the coins took. For a loss case that means a burden of proof you can only meet in advance, because you will no longer produce the records after the loss.

So while you still have access, secure the following: the purchase receipts with date, quantity and price, the withdrawal from the exchange to your own address with the associated transaction ID, your public addresses or the public master key of your wallet, and an export of your transaction history. If the worst happens, you add a coherent account of the events with a date, plus everything that documents the incident, from the correspondence with the manufacturer to the police report. A tax report from a portfolio tracker makes this work considerably easier; our comparison of crypto tax tools and portfolio trackers shows which tools are up to the job.

DAC8 and the German crypto tax transparency act: why the tax office knows your purchase but not your loss

Since January 1, 2026 the Crypto-Asset Tax Transparency Act, KStTG for short, has applied in Germany. It implements the European DAC8 directive and obliges providers of crypto-asset services to report details about their users and their transactions to the Federal Central Tax Office. The act regulates in separate sections the reporting obligation, the reporting period, which corresponds to the calendar year, the information to be reported and an electronic reporting procedure using an officially prescribed data record; breaches carry fines.

For those affected this creates an imbalance worth knowing about. The purchase of your coins on a reporting platform is documented and travels into the data holdings of the tax authorities. So does the withdrawal to your own wallet. What happens there afterwards is invisible to everyone: a lost recovery phrase generates no report, and an address nobody can access any more looks, from the outside, no different from an address where someone is waiting patiently.

That is no reason for alarm, but it is a reason for care. If your data shows an inflow with no sale to match it, you should be able to explain why. Clean documentation is no formality here; it is the difference between a query and an estimate.

Loss offsetting and loss carry-forward under Section 10d: what happens to recognised losses

Suppose your case is recognised, or you realise losses elsewhere: a tight set of rules then applies. Losses from private disposal transactions may only be offset up to the amount of the gains you made from private disposal transactions in the same calendar year. They cannot be set against your salary, against interest or against dividends.

What is left over is not forfeited. Through the reference to Section 10d of the Income Tax Act, such losses reduce the income from private disposal transactions of the immediately preceding year or of the following years. A loss year therefore lives on until it meets a year with gains. The condition is that the loss is declared and formally assessed; nobody carries it forward on their own initiative.

Note the exemption threshold of 1,000 euros as well: gains from private disposal transactions remain tax free if the total gain for a calendar year stays below it. Anyone already under that threshold gains nothing from an elaborate argument about losses.

Theft, hack or fraud: where the line to a lost device runs

For tax purposes all these cases end up at the same problem, the missing disposal transaction. In practice they differ considerably, and the difference decides what you do first.

If only the device has disappeared and your recovery phrase is safely stored, nobody has access and you have time for a clean restore. If your words have fallen into someone else's hands, however, through photos in the cloud, a phishing call or a break-in, every minute counts: you then transfer your holdings immediately to a freshly generated wallet whose phrase the attacker has never seen. If the coins have already gone, the case is a criminal offence with everything that entails. How to proceed and why a police report makes sense even without any prospect of recovery is set out in our guide to what to bear in mind with stolen crypto-assets and the police report.

Keep the distinction clean, including towards the tax office. A self-inflicted loss of the backup, a theft and an investment fraud are three different sets of facts, to be described differently and documented differently.

Prevention: what to change today so the case never arises

The best way to handle this topic is never to need it in practice. Four habits do the bulk of the work.

Never store your recovery phrase digitally, neither as a photo nor in a password manager that sits in a cloud. Keep it in two physically separate places so that water damage or a fire does not catch both copies; a stamped metal plate survives considerably more than paper. Test the restore once with a small amount before you move larger sums, because a backup that has never been checked is a hope and not a backup. And keep your tax records up to date alongside, because in an emergency they serve the same function as the backup itself.

If you are reorganising your custody anyway, our overview of software wallets compared will help with the question of which amounts belong on a device at all and which are better kept elsewhere.

Hardware wallet lost and tax: what you should take away

1. Rescue first, calculate later. Check the recovery phrase, the passphrase and the derivation path before you treat the loss as final. A new device following the open BIP39 standard is enough for that; you will find suitable models in our hardware wallet comparison.
2. Secure the records while you still can. Purchase receipts, transaction IDs, addresses and an export of your history are the only documents that allow any argument to be made later. A tax report from one of the tools in our comparison of crypto tax tools and portfolio trackers handles that continuously instead of once a year.
3. Keep your tax expectations low. Without a disposal the tax authorities regularly refuse to recognise the loss, and once the one-year period has expired even a recognised loss becomes worthless. Reorganise your custody instead, for instance with the help of our software wallet comparison, and plan your tax around the positions you can still move.

(As of September 18, 2026. This article is not investment advice. Prices and fee structures change; check the terms with the provider before you buy.)