Declare alone or with a crypto advisor? Comparison for Spanish investors

One of the most important decisions for the crypto investor in Spain: assume the declaration alone or hire a specialized advisor? There is no universal answer; It depends on your specific situation.

When can you declare alone

Self-declaration is viable if your situation is simple:

• You only have one exchange (or two).
• You operated rarely (less than 50 operations per year).
• You don't have DeFi, complex staking, NFTs or special situations.
• You have complete history of all purchases from the beginning.
• You do not have crypto abroad valued at more than €50,000 (or if you do, Model 721 is simple).

Tools to declare alone:

1. Koinly/Blockpit: Import the CSVs → generate the profit/loss report.
2. WEB Income (AEAT): You enter the data from the report in the declaration.
3. Tutorials and guides: There are numerous resources online and on YouTube for each step.

Cost: You only pay for the Koinly subscription (~€50-200/year depending on plan) or similar.

When you definitely need an advisor

Hire an advisor if you have any of these situations:

1. High volume of operations (>500 per year)

FIFO calculation with many trades and multiple exchanges is prone to errors. An error in the FIFO can cost thousands of euros in incorrect taxes (overpaying or underpaying).

2. Complex DeFi (LP, yield farming, liquid staking)

Liquidity positions, automatic rebalancing, impermanent loss and liquid staking have tax treatments that require professional judgment. An error can result in incorrect reporting or paying taxes that do not correspond.

3. NFTs as an economic activity

If you frequently buy and sell NFTs or create them as an artist/developer, the processing may be an economic activity with additional obligations (registration in the census model, VAT, etc.).

4. Mining or staking as a main activity

If the mining or staking activity generates significant income, you need to correctly structure the economic activity, deductions, amortizations, etc.

5. Special situations

• Exchange bankrupt.
• Hacking or loss of funds.
• Inheritance or donation of crypto.
• Change of tax residence.
• Company that also operates with crypto.

6. Great value at stake

If your crypto profits exceed €50,000 in the year, the cost of the advisor (€300-€2,000) is marginal compared to the risk of an error.

Cost comparison

The risk of misreporting

If you declare incorrectly (non-intentional error):

• Surcharge for late declaration (without prior requirement): 5-20% of the fee.
• Surcharge plus late payment interest: If the Treasury detects it after inspection.
• Penalty for minor infraction: 50% of the amount defrauded if there is fault.

A calculation error that generates €5,000 of unpaid taxes can cost €7,500 with penalties and interest.

How to find a good crypto tax advisor in Spain

Not all advisors are the same. Search:

• Specific specialization in crypto: A generalist advisor may not know the staking or DeFi regime.
• Demonstrable experience: Ask for references or examples of similar cases.
• Continuous update: The regulations change. A good advisor updates himself.
• Clear price: No surprises in the final invoice.

Where to look:

• Platforms such as declaracrypto.es or cripfiscal.es.
• LinkedIn searching for "cryptocurrency tax advisor Spain".
• Spanish crypto forums (Reddit r/spain_cripto, Telegram groups).

The hybrid approach: the best of both worlds

Many investors use a mixed approach:

1. They use Koinly to calculate the profit/loss report.
2. They review it with an advisor (consultation hour: €100-200).
3. The advisor verifies, adjusts and submits the return.

It is cheaper than hiring the full service and safer than going alone.

Updated: April 2026 | Fiscal year: 2025