Disclaimer: The information in this article provides a general overview and does not claim to be exhaustive. It cannot replace a detailed, individual consultation. TX-Partner assumes no liability for the accuracy, timeliness, or completeness of this information.
You sell crypto, transfer the proceeds to your bank account, and a few days later the bank asks: where did this money come from? This is happening more often. Banks across Europe and the US are increasing their scrutiny of crypto-related deposits. The regulatory pressure is real, and it is not going away. If you hold crypto and interact with the traditional banking system, understanding proof of funds is no longer optional.
01 What Is a Crypto Proof of Funds?
A crypto proof of funds is a document that traces the origin and movement of your crypto assets. It answers one question for the bank: where did this money come from?
This is different from proving you have money (proof of balance). A proof of funds traces the path: how the crypto was acquired, how it moved between wallets and exchanges, and how it eventually became the fiat deposit hitting your bank account.
Banks need this documentation because they are required to verify the source of funds under anti-money laundering (AML) regulations. They are not interested in your tax situation. They are interested in whether the money is legitimate.
02 When Do Banks Require a Proof of Funds?
There is no single threshold that triggers a bank request. It depends on internal compliance policies, the size of the transaction, and the bank's risk appetite for crypto-related deposits. That said, there are common situations where banks consistently ask for documentation:
Common Triggers:
Fiat Off-Ramp
You sell crypto on an exchange and transfer the proceeds to your bank account. The bank sees an incoming wire from a crypto platform.
Account Opening
You open a new bank account and declare crypto as a source of wealth. The bank requests documentation before activation.
Mortgage or Loan Application
You use crypto proceeds as part of your financial profile for a mortgage. The lender needs verifiable documentation of the source.
Compliance Review
Your bank runs periodic compliance checks and flags crypto-related activity. This can happen retroactively, even months after a deposit.
Since the EU Transfer of Funds Regulation (TFR) took effect on December 30, 2024, crypto asset service providers in the EU must collect sender and beneficiary information for all crypto transfers, with no minimum threshold. This means even small transactions now carry documentation requirements at the platform level, and banks are aware of this heightened transparency.
Sources: EU Regulation 2023/1113 (TFR), GwG (Germany), AMLD6, MiCA (EU 2023/1114)
03 Tax Report vs. Proof of Funds: The Difference
This is where most people run into problems. They get the bank request, open their crypto tax tool, generate a tax report, and send it over. Then the bank comes back and says: this is not what we asked for.
A tax report and a proof of funds serve fundamentally different purposes.
The Key Difference:
Tax Report
- Designed for tax authorities
- Shows gains and losses
- Focuses on taxable events
- Aggregated by tax period
- No fund flow tracing
Proof of Funds
- Designed for banks / AML compliance
- Shows origin and movement of funds
- Focuses on traceability
- Follows the full asset lifecycle
- Includes on-chain verification
Crypto tax tools like Blockpit or CoinTracking are primarily designed for tax calculations. Some now also offer features to trace transaction paths – a useful first step. What is missing, however, is the explanatory perspective: Why did holdings increase? How do individual transactions connect? What does a specific transaction flow mean economically? Banks need this context to actually understand crypto fund flows. The underlying data for both tax reports and proof of funds is the same: your complete crypto documentation.
04 What Should a Crypto Proof of Funds Contain?
Banks do not publish a standard template for crypto proof of funds. Requirements vary between institutions. But based on consistent patterns across compliance departments in the EU and internationally, a solid proof of funds typically covers these elements:
- Complete fund flow –From the initial fiat-to-crypto purchase through every significant movement to the final off-ramp. The bank wants to see the full path, not just snapshots.
- On-chain verification –Transaction hashes (TX IDs) that can be independently verified on a blockchain explorer. This is what makes crypto documentation different from traditional finance: the data is verifiable.
- Wallet and exchange mapping –A clear overview of which wallets and exchange accounts belong to you, and how funds moved between them. The bank needs to understand the structure.
- Asset development timeline –How your crypto holdings developed over time. When did you buy, when did you sell, what was held long-term? This gives context to the final amount being deposited.
- Compliance-ready presentation –The document needs to be structured in a way that a compliance officer (who may not understand crypto) can follow and process. Raw CSV exports do not meet this standard.
The level of detail depends on the size of the deposit and the bank's internal requirements. For larger amounts, expect more scrutiny. For any crypto-to-fiat deposit, expect at least some level of documentation request.
05 What Documents Does the Bank Actually Need?
The exact list varies by bank. In practice, however, certain documents are consistently expected. An important point: the bank typically wants to see not just the crypto path, but also the fiat origin. That means: where did the money come from that you used to buy crypto in the first place?
Fiat Origin: Where Did the Investment Capital Come From?
Documents by source of capital:
Salary / Income
Bank statements from the last 3-6 months showing salary deposits and the transfer to the crypto exchange. In Austria, additionally the annual pay slip (L16).
Inheritance
Certificate of inheritance (Einantwortungsurkunde in AT, Erbschein in DE), possibly with a bank statement showing the credit.
Gift
Gift agreement or deed, for monetary gifts additionally the bank statement showing the credit.
Property or Securities Sale
Purchase contract, land registry extract, or securities account statement with sales settlement, each supplemented by the bank statement showing the incoming payment.
Loan / Credit
Credit agreement signed by all parties, plus bank statement showing the disbursement.
Self-Employment / Business
Income-expense statement or balance sheet, tax assessment, if applicable company register extract (AT) or commercial register extract (DE).
Crypto Path: From Purchase to Payout
Crypto-specific evidence:
Exchange Transaction Histories
CSV or PDF export of the complete trading history from every exchange used. Must include buy and sell timestamps, amounts, and trading pairs.
On-Chain Evidence (TX Hashes)
Transaction hashes of relevant blockchain transfers. This allows the bank or its compliance service provider to independently verify transactions via a block explorer.
Wallet Mapping
An overview of which wallet addresses belong to you and how they are linked to your exchange accounts.
Bank Transfer Receipts
Bank statements showing the deposit from your bank account to the crypto exchange and the later withdrawal back.
Asset Development (Timeline)
A chronological overview that makes the build-up of your crypto portfolio over the years traceable.
A common misconception: some crypto investors believe only the crypto part needs to be documented. But if you invested 30,000 euros in crypto in 2019, the bank also wants to know where those 30,000 euros came from. Was it salary? A property sale? An inheritance? Both sides belong together.
06 DeFi, Staking, and Mining: Why It Gets More Complicated
If you only bought and held crypto on a centralized exchange, it is relatively straightforward. The exchange provides transaction histories, and the attribution is usually clear. It gets significantly more complex with DeFi activities, mining, and staking.
Special Challenges:
DeFi Protocols (Uniswap, Aave, Curve...)
There is no central exchange providing an export. All transactions are exclusively on-chain. Liquidity providing, yield farming, and token swaps on decentralized exchanges must be individually traced and documented.
Multi-Chain and Bridges
Anyone who has moved assets between Ethereum, Polygon, Arbitrum, or Solana must document bridge transactions without gaps. For the bank, a bridge transfer initially looks like an outflow on one chain and an unexplained inflow on another.
Mining
Banks typically need proof of mining hardware (purchase receipts, photos), pool information (rewards, hashrate), and the transaction history of mining wallets with TX hashes.
Staking Rewards and Airdrops
Staking rewards and airdrops are inflows without consideration. For the bank, it must be documented where the original stake came from, which rewards were generated, and how airdrops reached your wallet.
NFT Sales
NFT transactions often run through marketplaces like OpenSea or Blur. The buy and sell history must be documented with wallet addresses and TX hashes, including the provenance of the NFT.
For simple portfolios (buy on exchange, hold, sell), a proof of funds can typically be created with manageable effort. For complex portfolios with DeFi activities, multiple chains, and hardware wallets, the documentation effort increases significantly. This is where the greatest need for action arises, as crypto tax tools alone often cannot accurately capture this complexity.
07 Without Proof of Funds: What Happens?
The consequences of a missing or incomplete proof of funds are real and can be severe. Banks and crypto exchanges are legally required to act when there are doubts about the origin of funds.
Possible Consequences:
Account Freeze / Frozen Funds
The bank can freeze incoming funds until the origin is proven. In practice, this means no access to the money, potentially for weeks or months.
Termination of Banking Relationship
If proof cannot be provided, banks terminate the business relationship. Opening a new account becomes significantly harder afterwards, as the termination is recorded in internal systems.
Suspicious Activity Report
When suspicion of money laundering arises, the bank is required to file a report with the relevant authority (FIU). This happens automatically and regardless of whether an actual crime has been committed.
Account Deactivation on Crypto Exchanges
Crypto exchanges like Bitpanda also require proof of funds. If proof is not provided, the account can be deactivated after a final review. Typically, there is an opportunity to withdraw remaining assets beforehand.
The critical point: these consequences do not only affect cases with criminal backgrounds. They affect anyone who cannot document their crypto origin without gaps. This happens more often than people think, especially with portfolios that have grown over multiple years, exchanges, and wallets.
08 Case Study: From Bank Letter to Documentation
A concrete scenario from practice, presented anonymously.
Starting Situation:
A crypto investor from Austria wants to transfer 85,000 EUR from a crypto exchange to their bank account. The bank requests a proof of funds and sets a deadline of 4 weeks.
The portfolio: purchases since 2018 across three different exchanges, transfers to a hardware wallet, multiple DeFi positions on Ethereum and Polygon, staking rewards.
First attempt: the investor submits their tax report from the crypto tax tool. The bank rejects it because the report does not make the fund flows traceable.
Documentation Path:
Document fiat origin
Bank statements show the SEPA transfers from the salary account to crypto exchanges between 2018 and 2023. Pay stubs confirm the origin of the investment capital.
Reconstruct crypto transactions
Export all exchange histories, trace on-chain transactions on Ethereum and Polygon, document DeFi positions and staking rewards.
Create fund flow documentation
Prepare the entire chain from salary account through exchanges, DeFi protocols, and wallets to the payout in a traceable document. Including TX hashes for the key transactions.
Bank-ready preparation
Prepare the document so that the bank's compliance department can follow it without blockchain expertise. With a summary overview and the supporting individual evidence.
In this case, the documentation was submitted within the deadline. The bank had no further questions. The payout was released.
09 How TX-Partner Helps With Proof of Funds
The starting point for a proof of funds is the crypto documentation in the crypto tax tool. For tax purposes, all transactions are collected there anyway – all wallets and exchanges imported, all inflows and outflows classified. This complete crypto history is simultaneously the foundation from which a solid proof of funds can be derived.
TX-Partner works with this crypto documentation as its foundation. From the data in the crypto tax tool, all relevant information for the bank can be derived: which addresses and exchange accounts were used, where on-ramps (fiat to crypto) and off-ramps (crypto to fiat) occurred, how holdings developed, where documentation gaps exist, and what the key transaction flows were.
The decisive step is then preparing this data in a way the bank can understand. A compliance department typically does not understand crypto transaction flows. TX-Partner explains not only what happened, but also why: why did the portfolio develop this way? Why was a particular transfer made? Why is the payout amount higher than the original investment?
This is what distinguishes a TX-Partner proof of funds from a simple data export. It is not a collection of transaction lists, but a traceable explanation of the entire crypto history, backed by the underlying data and on-chain evidence. From over 500 cases, TX-Partner knows how to put crypto transaction flows into words that are understandable even with tens of thousands of transactions.
The foundation is the TX documentation standard with its 4 pillars: completeness, traceability, technical accuracy, and long-term usability. Each pillar directly contributes to the quality of the proof of funds.
TX-Partner does not calculate taxes and does not provide tax advice. TX-Partner ensures that the crypto documentation is prepared so that tax advisors can calculate correctly and banks receive the substance they need for their compliance review.
With the DAC8 directive, in effect since January 2026, crypto exchanges automatically report transaction data to tax authorities. The requirements for seamless crypto documentation continue to rise. Those who document their crypto history properly today are simultaneously prepared for proof of funds, tax audits, and future compliance requirements.
For the specific process and all details on proof of funds for banks, see the dedicated service page.
Frequently Asked Questions
What is a crypto proof of funds?
A crypto proof of funds is a document that traces the origin, movement, and current state of your crypto assets. It shows banks and financial institutions where your funds came from and how they developed over time – typically required under AML regulations like AMLD5/6 or MiCA.
Why won't my bank accept a tax report as proof of funds?
Tax reports from crypto tax tools like Blockpit or CoinTracking are designed for tax authorities – they show gains and losses. Banks need something different: a traceable fund flow that proves where the money came from and how it moved. A tax report does not contain wallet-to-wallet tracing, on-chain verification, or a compliance-ready audit trail.
What documents do I need for a crypto proof of funds?
A proper crypto proof of funds typically includes: a complete fund flow from initial purchase to current holdings, on-chain verification with transaction hashes, wallet and exchange mapping showing all accounts, an asset development timeline, and a compliance-ready presentation that banks can process.
Can TX-Partner create a proof of funds?
TX-Partner builds the crypto documentation that serves as the foundation for a proof of funds. The starting point is the crypto documentation in the crypto tax tool. From there, TX-Partner derives the proof of funds and explains transaction flows so that compliance teams can follow and understand them.
What happens if I cannot provide a proof of funds?
Consequences vary by institution. In practice, the bank may freeze funds, terminate the business relationship, or file a suspicious activity report with the FIU. Crypto exchanges can also deactivate accounts if proof is not provided. These consequences affect anyone who cannot document their crypto origin, not just suspicious cases.
Do I also need to prove the fiat origin?
In most cases, yes. The bank wants to trace not just the crypto path but also where the money for the initial crypto purchases came from. Typical documents include bank statements, pay stubs, inheritance certificates, or sale contracts, depending on the source of the investment capital.
What is the difference between proof of funds and proof of wealth?
A proof of funds documents where the funds for a specific transaction or deposit came from. A proof of wealth shows the origin of your entire wealth. Banks may request one or both depending on the situation. The distinction matters because it determines the scope of documentation required.
Is a proof of funds possible for DeFi portfolios?
Yes, but the effort is significantly higher. With DeFi, there is no central exchange that exports transaction data. All activities must be reconstructed from on-chain data. TX-Partner has experience with complex DeFi portfolios, multi-chain setups, and tens of thousands of transactions.
Proof of Funds for Your Bank?
TX-Partner reviews your crypto documentation and identifies gaps. Non-binding in 30 minutes.
Free Doc CheckFurther Information
Co-Founder & Documentation Specialist
Robert Thorn is Co-Founder of TX-Partner, specializing in complex crypto documentation for tax advisors and private investors in Austria and Germany.