Mapping out your crypto assets: an overview before your next tax return
Date: | Week 21 | Reading time: 8 minutes | Updated: Author: Tyler Dijst
In short
Mapping out crypto assets means recording which crypto you hold, where it sits, what it was worth on a reference date and how you acquired it. You can usually do part of that yourself. A complete overview that a bank or HMRC can check normally needs someone to reconstruct the whole history.
Paucitas is an independent expert firm in the Netherlands that establishes legitimate crypto assets. In practice, questions about origin usually come from the tax authority or the bank, often when time is short.
Get in touch with Paucitas or ring +31 20 244 5774 before there is a deadline. A free intake is without obligation.
In a nutshell
An overview of your crypto assets answers four questions: what, where, how much and where it came from. Paucitas puts those four answers into one report that anyone can follow step by step.
An account with two exchanges, a hardware wallet in a drawer and perhaps a platform that closed years ago. As long as nobody asks, that is fine. Then your mortgage lender asks about the source of funds, or HMRC has a question about your return.
At that point the overview needs to be ready quickly. This blog explains what belongs in it, why it pays to sort it out now and how Paucitas helps you get it complete.
What does mapping out crypto assets mean? 4 questions
A complete overview of your crypto assets answers four questions:
- What: which coins and tokens you hold.
- Where: on which exchanges and in which wallets, with the matching addresses.
- How much: the balances and their value on a chosen reference date.
- Where from: the transactions that show how the holdings were built up, from the first deposit to today. That is the origin of assets.
The first three questions give a snapshot. The fourth makes the overview verifiable: someone else can check that the balances add up and that the money was obtained legitimately. That is exactly where many people get stuck, and where Paucitas can make the difference.
Why does an overview of your crypto assets matter now?
Crypto gains can be taxable, and HMRC expects you to keep records of every transaction, as set out on GOV.UK. On top of that, new reporting rules mean UK-based crypto providers collect user and transaction data from 1 January 2026 and send their first reports to HMRC in 2027 (GOV.UK). Within the EU a similar scheme, DAC8, applies.
So HMRC will see more and more of your purchases and balances. If you have a complete overview of your own, you can answer questions calmly. Paucitas does not give tax advice: we provide the evidence, and you or your adviser file the return. Worried about gaps in your history? Read incomplete crypto history.
Why does doing it yourself often only get you halfway?
Exchange exports are a good start, but they rarely tell the whole story. Transfers between your own wallets can look like purchases or sales. An exchange that has closed no longer provides an export. Swaps, staking and old addresses are often missing. The result is an overview that makes sense to you, but that a bank or HMRC cannot recalculate.
That is not a criticism: it is simply difficult. Does this sound familiar? Let Paucitas take a look or ring +31 20 244 5774. You can call at any time, 24/7. In a short intake you hear what is needed and what you already have.
An example from practice
A business owner bought crypto from 2017 onwards on three different exchanges. One of them no longer exists. When he applied for a mortgage, the lender asked for the source of the funds he wanted to put in. His own spreadsheet did not add up.
Paucitas linked his bank statements, the exports that were still available and the transactions on the blockchain. The result was one overview per reference date, showing the route of every pound. The lender could then assess the file itself, without endless follow-up questions.
Paucitas takes privacy very seriously and never shares clients' personal details. This is a composite example: names, amounts and details have been changed. The situation is one we see in practice.
How does Paucitas map out your crypto assets?
Paucitas combines your own records, such as exchange exports and bank statements, with the transactions on the blockchain. We also go through documents, emails and other communication, so that a complete picture emerges, with a timeline and where each part of your assets came from, step by step. We reconstruct purchases, swaps, transfers between wallets and income into one overview per reference date, with the origin included. Paucitas does all tracing itself, without tracing tools.
You receive a report that anyone can follow and understand step by step: your accountant, your lender, a solicitor or HMRC. Have you lost access to a wallet of your own? In the intake we also look at whether regaining access to your own wallet is technically possible.
What can you gather in advance?
Nothing needs to be perfect. Useful are: a list of exchanges, apps and wallets you have ever used (including closed accounts), the exports you can still download, the addresses of your own wallets and bank statements of the first deposits. Whatever is missing, we work out together with you.
What do you use the overview for?
The same overview is useful in many situations. What exactly is asked differs per situation:
- Bank and mortgage: read proving the origin of crypto to your bank and a mortgage with crypto assets.
- Tax: see the most common verification questions about crypto.
- Estates or insolvency: read crypto in an estate and crypto in bankruptcy.
- Businesses and accountants: read crypto on the balance sheet and substantiating crypto with your accountant.
The lender, the solicitor or HMRC makes the final decision. Paucitas makes sure you arrive with a well-evidenced file. More on our approach is in proving the origin of assets.
Who can map out crypto assets for you?
Paucitas. We are an independent expert firm in the Netherlands, founded in 2021, establishing legitimate crypto assets for individuals, business owners, advisers and solicitors.
- Costs: every investigation is tailored. You receive a bespoke quote in advance, which we go through together, so there are no surprises.
- Turnaround: from the same day to around two weeks.
- Contact: you can ring at any time, 24/7. We answer the form within 1 to 3 hours, and email within 24 hours, usually the same day.
Is a question from your bank or HMRC on its way, or would you simply like to be ready? Get in touch for a no-obligation introduction, or ring +31 20 244 5774. Building an overview is easier without a deadline.
Sources: GOV.UK, tax on cryptoassets; GOV.UK, reporting cryptoasset data to HMRC; European Commission, DAC8.
Do you have questions about this blog?
Feel free to get in touch with Paucitas. Paucitas can be reached by phone 24/7, including evenings and weekends. Through the contact form we usually reply within 1 to 3 hours, and we answer e-mail within 24 hours.
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Frequently asked questions about mapping out crypto assets
What do the new reporting rules change for my crypto?
Paucitas explains: UK-based crypto providers collect user and transaction data from 1 January 2026 and send their first reports to HMRC in 2027. With your own evidenced overview, you have the same information to hand.
Does Paucitas give tax advice?
Paucitas does not give tax advice, but maps out your crypto assets and evidences their origin. You, your accountant or your tax adviser use that overview for your return.
Can I have my crypto holdings recorded on a reference date?
Paucitas can do that and records which wallets and balances you held on a chosen date and what they were worth, for example at the end of a tax year or on the date of separation.
An exchange no longer exists. Can the overview still be complete?
Paucitas can often do that and then uses your bank statements, old emails and the transactions on the blockchain to reconstruct the missing parts. In the intake you hear what is feasible.
What does it cost to have my crypto assets mapped out?
Paucitas tailors every investigation. You receive a bespoke quote in advance, which we go through together, with no surprises. The turnaround is from the same day to around two weeks.
From Amsterdam, for the whole of the UK
Everything can be done fully online. Prefer to meet in person? You are very welcome at our office in Amsterdam, by appointment.
Paucitas is an independent expert firm based in the Netherlands that, for clients across the UK, investigates investment fraud and crypto fraud, establishes the origin and legitimacy of crypto assets and prepares expert reports for legal proceedings and compliance.
Your own situation
If you are reading this, you probably have a question about your own situation. That is exactly what Paucitas does.
The first step is contact by phone. You can book that call by phone or through the contact form, so you do not have to wait. In the call we look together at what can factually be established in your case and what Paucitas can examine for you.