Bitcoin taxation: general guide for individuals (CH, FR, DE, IT)

Marc, self-employed architect in Lausanne, buys his first Bitcoin in 2019. Since then, he has been putting a few hundred francs into DCA×DCA (Dollar Cost Averaging)Buying a small fixed amount at regular intervals (for example 100 EUR a week), regardless of price. Smooths the average purchase cost and neutralises timing bias.See in the lexicon → each month. In 2026, he holds around 1.8 BTC plus a few Bitcoin ETF shares on a Swiss securities account. On the tax side, he has never paid a cent on latent capital gains: this is the Swiss regime for a non-trader individual.

In spring 2026, his firm wins a contract in Paris. Marc accepts and plans his move for autumn 2027. Three weeks after the announcement, a tax-adviser friend asks him: « And your BTC, what are you doing? ». In Switzerland, his private capital gains are exempt. In France, they will be taxed at 30 %. Does the change of residence have a retroactive effect? Should he sell before moving? Should he declare his BTC on arrival? Nobody explained it to him.

Marc's situation is in no way exceptional. Any Bitcoin holder who at some point plans to use it (sell, spend, transmit, relocate) must understand the applicable taxation. Most Bitcoiners devote little time to it as long as they have not sold. The result: they make their exit decisions (cf. exit strategy) without integrating the tax dimension, which can represent 20 to 45 % of the gain depending on jurisdiction.

This guide exposes the basics applicable to CapBitcoin's 4 target jurisdictions (Switzerland, France, Germany, Italy). It aims at an average individual, not a professional trader or a company. The taxation topic contains 4 country articles, plus 3 cross-cutting articles on MiCA×MiCA (Markets in Crypto-Assets)European regulation 2023/1114 that frames crypto services across the EU since 2024. Creates the CASP status.See in the lexicon →, tax optimisation and corporate Bitcoin taxation. The Marc case serves as a light thread.

Immediate warning: this guide describes the law applicable on 27 May 2026. Bitcoin taxation evolves each year in several jurisdictions. No information here dispenses with the consultation of a locally authorised tax adviser before any significant action.

The 4 main categories of Bitcoin tax gains

Bitcoin taxation is structured around 4 types of gains, which are not treated identically across jurisdictions.

1. Capital gain×Capital gain, capital lossGain (or loss) realised when disposing of an asset: the difference between sale price and acquisition cost. Tax treatment varies by country; losses can often be offset against gains of the same year.See in the lexicon → on disposal. The most frequent case. The investor sells Bitcoin against fiat×Fiat (fiat currency)State currency with legal tender status (euro, Swiss franc, dollar), issued by a central bank and not backed by a physical asset. By contrast, Bitcoin has an issuance capped at 21 million units, with no central issuer.See in the lexicon → (EUR, CHF, USD) on an exchange×ExchangeService that lets you buy, sell and swap cryptocurrencies against fiat money. Examples : Kraken, Coinbase, Bitstamp, Bitvavo. Most are custodial.See in the lexicon → and realises a gain or loss versus the purchase price. This is the gain that affects Sylvain (cf. exit strategy) or Pierre (cf. lump-sum vs DCA) when they liquidate part of their position. Depending on jurisdiction, this gain is exempt (CH private, DE after 12 months), taxed at flat rate (FR 30 %, IT 26 %), or integrated into the progressive income (case of the professional trader everywhere).

2. Mining×MiningProcess of validating blocks through proof of work. Consumes electricity by design : that is what secures the network.See in the lexicon → income. The miner×MinerComputer or farm of computers that solves the cryptographic puzzle required to add a new block to the blockchain, in exchange for a bitcoin reward.See in the lexicon → receives BTC as reward for the computational work provided to the network. For target jurisdictions: this income is taxed as activity income (self-employed or salaried depending on structure) at the Bitcoin value on the day of receipt. The subsequent capital gain between receipt and sale is treated separately, under the movable capital-gain regime applicable to the mined coins. Marc is not concerned (he does not mine), but the retail investor who hosts a Lightning miner or a node×NodeComputer that runs the Bitcoin software and takes part in the network by validating blocks and transactions. A « full node » keeps a complete copy of the blockchain.See in the lexicon → with rewards is technically in this category.

3. Lending and staking×StakingLocking tokens to secure a proof-of-stake blockchain in exchange for a yield. Does not exist on Bitcoin, which relies on proof of work; tax-wise, staking income follows its own rules.See in the lexicon → income. Native Bitcoin has no staking mechanism (Proof of Work×Proof of Work (PoW)Bitcoin's consensus mechanism: miners spend energy to find a valid hash, which makes falsifying the history economically prohibitive. This work is what secures the blockchain.See in the lexicon →, not Proof of Stake). But interest received by lending BTC via Ledn, Unchained or similar platforms are interest income, taxable as such in all target jurisdictions. The tax rate is generally less favourable than capital gain in France (PFU×PFU (Prélèvement Forfaitaire Unique)French 30 percent tax on capital gains, including crypto gains. Also called the « flat tax ». Made up of 12.8 percent income tax and 17.2 percent social levies.See in the lexicon → 30 % as well, but enters « capital income »), and less favourable in Switzerland (interest taxable at progressive scale, unlike exempt private capital gains). The Bitcoin-as-collateral path presented in the exit strategy article partly falls in this category.

4. Exchange against good or service. Paying for a coffee, a trip, an apartment in Bitcoin triggers fiscally a disposal at the equivalent fiat value. The latent gain between acquisition and spending is realised. Practical implication: spending BTC is fiscally identical to selling them then spending fiat. This is the trap of « paying in Bitcoin » for a long-term holder with significant latent gain: each payment triggers a taxable gain. In France, Italy or Germany (if held < 12 months), this can produce a declarative obligation for each somewhat significant purchase. Marc, in Switzerland, is largely exempt on this point as a private individual.

To these 4 categories add 2 cross-cutting dimensions: wealth tax (Switzerland, and Spain for high estates, plus a few cantons), which hits Bitcoin value at 31 December independently of any sale, and the annual informational declaration (foreign exchange accounts in France form 3916-BIS×3916-bisFrench tax form used to declare crypto accounts held abroad. Omitting it is fined at 750 EUR per undeclared account.See in the lexicon →, RW declaration in Italy for non-EU exchanges, etc.) which does not create taxation but must be filed under penalty of fine.

For Marc in Switzerland, in May 2026, the current picture is simple: no tax on the latent gain (1.8 BTC at 170k CHF, purchase value ~22k CHF, latent gain ~148k CHF, exempt), but an annual wealth tax of about 0.4-0.5 % of Bitcoin value at 31 December (~750 CHF per year in Lausanne). He declares his BTC in his estate on the cantonal declaration, as he declares his bank accounts.

The arrival in France changes everything. The 4 categories become taxable, and the French tax entry value is computed on the original price (2019-2026 DCA×DCA (Dollar Cost Averaging)Buying a small fixed amount at regular intervals (for example 100 EUR a week), regardless of price. Smooths the average purchase cost and neutralises timing bias.See in the lexicon →), not on the value at the time of moving. Marc must anticipate this transition. The article declaring Bitcoin in France (055 forthcoming) will cover the detail.

The determining role of tax residence

Bitcoin taxation is not a feature of Bitcoin, it is a feature of the jurisdiction in which the holder resides. The same 1 BTC sold produces zero tax if the seller is a Swiss or long-term German tax resident, 26 % tax if Italian resident, and 30 % if French resident. Tax residence is the dominant parameter.

What is tax residence. For the great majority of target jurisdictions, tax residence is defined by 4 alternative criteria: permanent home, main stay (183 days/year in practice), centre of economic interests, nationality (subsidiary in case of double attachment). For a simple case (life, work, family in a single country), the qualification is unambiguous. For a complex case (cross-border worker, partial expatriate, retiree split between 2 residences), qualification may require a tax adviser opinion and examination of bilateral tax conventions.

Effect of changing residence. In tax law, the resident is taxed on his total worldwide income (« unlimited tax liability »), unless otherwise provided by bilateral conventions. A change of residence transfers this obligation to the new country on the effective date. For assets held before the move: the new jurisdiction applies its own tax rule from the entry date. Three technical questions always arise:

• What is the tax entry value? Depending on country, the original price (historical purchase price) or the value on the day of residence change. France generally uses the original price, which can be very unfavourable for a Bitcoiner×BitcoinerPerson interested in Bitcoin, who holds some and adheres more or less to its values (individual sovereignty, sound money, decentralisation).See in the lexicon → arriving with a large latent gain. Germany too, but the > 12-month exemption often neutralises the effect.
• Is there an exit tax×Exit taxTaxation of unrealised gains when transferring tax residence out of a country. France and Germany apply forms of it; a departure should be planned with a tax adviser.See in the lexicon →? Some countries (France notably, article 167 bis CGI since 2011) impose an « exit tax » on latent gains at departure, to avoid tax evasion by opportunistic relocation. The French trigger threshold is 800,000 EUR of latent gains (revisable). Marc, below the threshold, is not concerned, but an investor with a one-million-euro latent gain would be.
• The precise calendar of the change. Selling 1 day before the official residence change or 1 day after can produce radically different results. The official change is defined by registration in the resident registry of the new country (mairie in France, commune in Switzerland, Anmeldung in Germany, comune in Italy) and by the effective physical move. The date is documentable and enforceable.

Three typical strategies in a CH → FR switch (Marc example). (a) Sell everything before the move, benefiting from the Swiss exemption, eliminating future taxation but sacrificing long-term Bitcoin exposure. (b) Sell partially (50 % for example), keeping the other half which will be taxed at 30 % in France on future resales. (c) Sell nothing and move with the BTC, accepting the 30 % PFU×PFU (Prélèvement Forfaitaire Unique)French 30 percent tax on capital gains, including crypto gains. Also called the « flat tax ». Made up of 12.8 percent income tax and 17.2 percent social levies.See in the lexicon → on any future sale. The total gap between options (a) and (c) over 10 years can reach several tens of thousands of euros for a moderate estate, and much more for large estates.

This decision is prepared with a tax adviser knowing both jurisdictions, ideally 12-18 months before the effective move. The larger the estate, the more profitable the preparation time.

Overview of the 4 target jurisdictions

Before the detailed table, a synthetic overview of the 4 Bitcoin tax regimes for individuals, on 27 May 2026.

Switzerland. The most favourable regime for private long-term holding. Capital gains on cryptoassets held in private estate are exempt from income tax, in line with federal tax practice (AFC×AFC (Administration Fédérale des Contributions)Swiss federal tax administration, which sets the criteria for crypto wealth and professional income.See in the lexicon → circular n° 36) and cantonal. The condition is not to qualify as a « professional securities trader », which requires meeting 5 criteria (average holding duration ≥ 6 months, transaction volume consistent with estate management, no debt financing, no use of leverage, crypto gains < 50 % of total income). For Marc, these criteria are widely met. On the estate side, wealth tax at cantonal rate (~0.3 to 0.8 % depending on canton), and declaration at 31 December. Mining and lending, however, are taxed at the progressive scale as activity income.

France. Intermediate to unfavourable regime. Capital gains on cryptoassets realised by an individual in occasional private management are taxed at the PFU×PFU (Prélèvement Forfaitaire Unique)French 30 percent tax on capital gains, including crypto gains. Also called the « flat tax ». Made up of 12.8 percent income tax and 17.2 percent social levies.See in the lexicon → (Single Flat Rate Withholding) of 30 % since 2019, i.e. 12.8 % income tax + 17.2 % social levies. The option for the progressive scale is possible, but rarely more favourable above 30,000 EUR of annual income. Only Bitcoin → fiat×Fiat (fiat currency)State currency with legal tender status (euro, Swiss franc, dollar), issued by a central bank and not backed by a physical asset. By contrast, Bitcoin has an issuance capped at 21 million units, with no central issuer.See in the lexicon → or Bitcoin → good/service conversions are taxed; crypto-to-crypto conversions are fiscally neutral. An exit tax×Exit taxTaxation of unrealised gains when transferring tax residence out of a country. France and Germany apply forms of it; a departure should be planned with a tax adviser.See in the lexicon → (article 167 bis CGI) applies in case of departure abroad if latent gains exceed 800,000 EUR. Mandatory declaration of foreign exchange×ExchangeService that lets you buy, sell and swap cryptocurrencies against fiat money. Examples : Kraken, Coinbase, Bitstamp, Bitvavo. Most are custodial.See in the lexicon → accounts (form 3916-BIS×3916-bisFrench tax form used to declare crypto accounts held abroad. Omitting it is fined at 750 EUR per undeclared account.See in the lexicon →), under penalty of 750 EUR fine per undeclared account.

Germany. Most favourable regime for holding > 12 months, and most unfavourable for holding < 12 months. For an individual holding Bitcoin more than 12 months (§23 EStG, Spekulationsgewinne), capital gains are totally exempt from tax. For Bitcoin held less than 12 months, the gain is taxed at progressive scale (up to 45 %, plus Soli solidarity contribution of 5.5 % above a threshold). This duality creates a very visible threshold effect: a German investor has a strong interest in not selling before 12 months of holding. Mining and lending are taxed as activity income.

Italy. Intermediate regime. Since the 2023 finance law then the 2025 revision, capital gains on cryptoassets are taxed at a flat rate of 26 % for individuals (raise to 33 % proposed in the 2026 finance law, applicable from 2027 subject to final adoption). The 2,000 EUR annual allowance was removed in the 2025 version. Capital losses on cryptoassets are deductible from other cryptoasset gains over 4 years. Mandatory RW declaration for non-EU accounts (Coinbase US for example).

The 4 regimes in one sentence. For a long-term Bitcoiner×BitcoinerPerson interested in Bitcoin, who holds some and adheres more or less to its values (individual sovereignty, sound money, decentralisation).See in the lexicon → individual (Marc, Sylvain, Pierre), Switzerland is the reference jurisdiction (zero tax on private capital gain×Capital gain, capital lossGain (or loss) realised when disposing of an asset: the difference between sale price and acquisition cost. Tax treatment varies by country; losses can often be offset against gains of the same year.See in the lexicon →), Germany is very favourable for holding > 12 months (zero tax after 12 months), France and Italy tax at moderate flat rate (30 % and 26 %). No regime is universally « good » or « bad »: the result depends on profile (hold vs trader), horizon (short vs long term), estate (CH wealth tax) and other income (FR or DE short-term progressive scale option).

The articles of the taxation topic dig into each jurisdiction with: precise declaration forms, numerical examples, legal optimisations (French PEA-PME that can hold crypto ETFs under conditions, Swiss 3a holding, etc.), particular cases (cross-border, student, retiree).

Central table: 4 jurisdictions × 4 gain types

Operational synthesis. For each jurisdiction × gain type combination, applicable rate and essential particularities. Data on 27 May 2026, applicable to the individual in private management. Always check with a local tax adviser before any action.

Key readings of the table.

• Capital gain on sale is the dominant item for the long-term holder individual. Switzerland (0 %) and Germany > 12 months (0 %) are reference regimes for long-term holding.
• Mining is everywhere taxed as activity income, at high rates (progressive scale). It is the most fiscally unfavourable operation in all jurisdictions.
• Lending is less favourable than capital gain in Switzerland (40 % instead of 0 %), equivalent or less favourable in France (PFU or scale), more favourable than a short-term sale in Germany (25 % instead of 45 %), equivalent in Italy (26 %). It is a classic trap for the Swiss individual: Ledn interest is taxed, unlike BTC capital gains.
• B&S exchange fiscally reproduces a sale. For the Swiss individual, it is inconsequential (sale exempt). For the French, the declarative puzzle can discourage daily Bitcoin use.

Consequence for Marc. In 2026, he is in Switzerland, so 0 % on capital gains but ~0.5 % per year on his wealth. Annual total ~750 CHF. From 2027 in France, his future sales will pay 30 %. He keeps the latency (until sale, no taxation), but loses the exemption. The 10-year differential, as calculated in section 3, potentially reaches 50,000 EUR. Mining and lending do not concern Marc (he does neither).

Tax tracking and declaration tools

Bitcoin taxation produces a declarative burden that can become heavy for an active investor: each sale, each exchange×ExchangeService that lets you buy, sell and swap cryptocurrencies against fiat money. Examples : Kraken, Coinbase, Bitstamp, Bitvavo. Most are custodial.See in the lexicon →, each Bitcoin expenditure triggers an operation to document and report in the annual declaration. For a monthly DCA×DCA (Dollar Cost Averaging)Buying a small fixed amount at regular intervals (for example 100 EUR a week), regardless of price. Smooths the average purchase cost and neutralises timing bias.See in the lexicon → over 5 years, this represents 60 purchases to trace, plus potential sales. Without a tool, the exercise becomes impossible beyond a few dozen operations.

Established software tools. Three solutions dominate the European market in 2026 for the individual:

• Koinly (~50-200 EUR/year depending on volume): API×API (Application Programming Interface)Interface that lets one program query another program or service. mempool.space exposes a public API for querying the chain.See in the lexicon → connection to most exchanges (Bitstamp, Kraken, Coinbase, Binance, Relai), wallet×WalletSoftware or device that manages your Bitcoin keys and lets you sign transactions. A wallet does not really « hold » your bitcoins, it holds the keys that prove you own them.See in the lexicon → import by on-chain address, pre-formatted tax export for France (PFU×PFU (Prélèvement Forfaitaire Unique)French 30 percent tax on capital gains, including crypto gains. Also called the « flat tax ». Made up of 12.8 percent income tax and 17.2 percent social levies.See in the lexicon → and 2086), Switzerland (cantonal declaration), Germany (§23 EStGק23 EStG (Spekulationsfrist)German tax provision that fully exempts Bitcoin capital gains after a holding period of more than 12 months.See in the lexicon →), Italy (RW + quadro RT×Quadro RT, Quadro RWSections of the Italian tax return covering crypto capital gains (RT) and holdings of foreign accounts (RW).See in the lexicon →). The most complete for CapBitcoin's target jurisdictions.
• CoinTracking (~120-700 EUR/year depending on volume): older and more precise equivalent for certain advanced cases (lending, derivatives, mining×MiningProcess of validating blocks through proof of work. Consumes electricity by design : that is what secures the network.See in the lexicon →), less polished interface. German origin, very used among DE/AT Bitcoiners.
• Blockpit (~60-300 EUR/year): Austrian alternative, DACH focus (Germany, Austria, Switzerland), good coverage of German §23 EStG and Swiss particularities.

For a very simple holder (1 exchange, regular DCA purchases, no lending or mining), a well-kept Excel/Google Sheets spreadsheet may suffice. Beyond 50 operations/year or 2 different data sources, a dedicated tool becomes necessary.

The annual tax sheet to compile. Regardless of the tool used, every Bitcoin investor must compile each year a file keeping:

• The complete history of operations (date, type, counterparty, fiat×Fiat (fiat currency)State currency with legal tender status (euro, Swiss franc, dollar), issued by a central bank and not backed by a physical asset. By contrast, Bitcoin has an issuance capped at 21 million units, with no central issuer.See in the lexicon → equivalent amount on the day of operation, fees).
• Exchange supporting documents (monthly statements downloaded and archived in PDF).
• Bitcoin addresses of self-custody×Self-custodyModel in which you hold your own private keys. Your bitcoins depend on no third party. This is Bitcoin's founding promise.See in the lexicon → wallets (proof of ownership via message signing if requested in case of audit).
• FIFO×FIFO (First In First Out)Capital gains method that treats the first bitcoins bought as the first sold. Used in Germany, Italy and the United States.See in the lexicon → (first in, first out) gain calculations if the jurisdiction requires it (FR, IT case). Switzerland allows FIFO or weighted average price by choice, provided one is consistent over time.
• Copy of annual tax declarations including BTC (CH cantonal declaration, form 2086 and 3916-BIS×3916-bisFrench tax form used to declare crypto accounts held abroad. Omitting it is fined at 750 EUR per undeclared account.See in the lexicon → FR, Anlage SO DE, quadro RT IT).

This file is kept at least 10 years in most target jurisdictions (standard tax prescription). In case of audit (low but real frequency for crypto individuals since 2023), it is the base defence.

Marc in practice. For his 2019-2026 DCA on Bitcoin Suisse, Marc already has all his operations on the Bitcoin Suisse portal (downloadable in CSV) and his BitBox02 wallet documented since 2021. For the move to France, he will need to: (a) compile a complete sheet of historical purchase prices (which will define the French tax entry value), (b) subscribe to Koinly for his French 2027, (c) declare his Bitcoin Suisse account via form 3916-BIS upon arrival in France. Annual tool cost: ~100 EUR. Initial setup time: 8-12 hours. Done well, this work prevents any subsequent declarative problem.

Audit risks and good practices

Bitcoin taxation has long been perceived by individuals as a little-controlled domain. This perception is obsolete since 2023. Three evolutions have made control systematic:

1. KYC×KYC (Know Your Customer)Mandatory identification procedure that regulated platforms apply to their users : ID document, proof of address, and so on.See in the lexicon →/AML×AML (Anti-Money Laundering)Set of rules to fight money laundering. KYC is the first building block. Frames what exchanges can or cannot let you do.See in the lexicon → traceability. All exchange×ExchangeService that lets you buy, sell and swap cryptocurrencies against fiat money. Examples : Kraken, Coinbase, Bitstamp, Bitvavo. Most are custodial.See in the lexicon → platforms operating in the EU and Switzerland (Bitstamp, Kraken EU, Coinbase EU, Binance EU, Relai) have been subject since 2020-2024 to strict KYC obligations (customer identification) and AML (suspicious operations reporting). MiCA×MiCA (Markets in Crypto-Assets)European regulation 2023/1114 that frames crypto services across the EU since 2024. Creates the CASP status.See in the lexicon → in Europe has strengthened this framework since late 2024. Concretely: any > 1,000 EUR operation on a regulated exchange is traced and can be communicated to the tax administration of the country of residence on request. For Marc, his 6 years of Bitcoin Suisse operations are perfectly documented and accessible to the AFC×AFC (Administration Fédérale des Contributions)Swiss federal tax administration, which sets the criteria for crypto wealth and professional income.See in the lexicon →.

2. CRS / DAC8×DAC8European directive that requires crypto platforms to share tax data on their users with European tax administrations. Applicable from 2026.See in the lexicon → international cooperation. The OECD Common Reporting Standard (CRS) is extended to cryptoassets by the European DAC8 directive, applicable since January 2026. Exchanges automatically report foreign residents' accounts to their national tax administrations. A French citizen who holds an account on Bitstamp Luxembourg will see his balances and operations transmitted each year to the French tax administration. Switzerland has signed an equivalent protocol applicable from 2027 (without retroactivity to pre-existing accounts). Clearly: concealment via foreign exchange is no longer possible in 2026.

3. On-chain analysis by administrations. Tax administrations (DGFiP in France, AFC in Switzerland, BZSt in Germany, Agenzia delle Entrate in Italy) have been using on-chain analysis tools since 2022-2024 (Chainalysis Reactor, Elliptic Investigator, TRM Labs). A Bitcoin address×Bitcoin addressString of characters that identifies a destination for receiving bitcoins. Four main formats, starting with 1..., 3..., bc1q... or bc1p... (Taproot, the recommended format in 2026).See in the lexicon → declared by a taxpayer is monitored to verify×Don't trust, verifyBitcoiner mantra. Trust no one (bank, government, exchange, influencer), verify on your own through your own node.See in the lexicon → the consistency of transactions with the declaration. Transfers between self-custody×Self-custodyModel in which you hold your own private keys. Your bitcoins depend on no third party. This is Bitcoin's founding promise.See in the lexicon → wallet×WalletSoftware or device that manages your Bitcoin keys and lets you sign transactions. A wallet does not really « hold » your bitcoins, it holds the keys that prove you own them.See in the lexicon → and exchange are identified. Pure hold is not problematic (no transaction = no taxable event), but under-declaration of sales or lending income becomes detectable.

Practical consequences. Documented Bitcoin tax audit cases in 2024-2026 in the target jurisdictions show a constant pattern: the administration does not attack the hold or the investment, it attacks non-declaration or under-declaration of sales. Fines typically range from 40 % to 80 % of the undeclared gain, plus interest for late payment, plus sometimes additional penalties in case of characterised bad faith.

4 good practices to stay compliant.

1. Declare even zero-tax operations. In Switzerland, declaring BTC in the estate does not entail capital gain×Capital gain, capital lossGain (or loss) realised when disposing of an asset: the difference between sale price and acquisition cost. Tax treatment varies by country; losses can often be offset against gains of the same year.See in the lexicon → tax, but it is mandatory for wealth tax. Omitting declaration under the pretext that it is income-exempt produces a disproportionate audit risk. Same for foreign exchange accounts in France (3916-BIS×3916-bisFrench tax form used to declare crypto accounts held abroad. Omitting it is fined at 750 EUR per undeclared account.See in the lexicon →).
2. Document each operation in real time. Do not try to rebuild 5 years of history all at once in panic in April 2027 when the tax authority asks. Each purchase, each sale, each transfer is documented in the week it occurs.
3. Keep supporting documents for 10 years, ideally on 2 independent media (encrypted cloud + external disk). Standard tax prescription is 10 years, 15 years in case of presumed fraud.
4. Consult a locally authorised tax adviser for any non-trivial case. The rate is 200-500 EUR for a 1-2h consultation, to be compared with the 10,000-100,000 EUR of potential audit. It is the most profitable investment of the Bitcoin journey.

For Marc, who prepares his move to France, these 4 practices are to be implemented immediately, not in September 2027.