The tax authority gets its information three main ways: the informational returns (Modelo 172 and 173) filed by Spanish exchanges, the EU DAC8 directive that forces international platforms to share data, and the tracking of bank transfers to crypto platforms. (Linked articles are in Spanish.)

Cold wallets (Ledger, Trezor) are private, but they still leave a trace on the blockchain the moment you send funds to them from an identified exchange. At colvence we specialise in on-chain tracing; we help you declare those movements so that the privacy of a cold wallet does not turn into an audit over unexplained wealth. (Linked article in Spanish.)

Our team processes your exchange and wallet history to calculate acquisition and disposal values precisely under the FIFO method. Unlike generic software, we review the traceability by hand so the final figures hold up before we hand you the report. (Linked article in Spanish.)

Yes. Beyond producing the technical report, we offer filing with the Spanish tax authority as an add-on service. We make sure the tax information carries across correctly into your income tax return, so the process is handled end to end.

The Modelo 721 is a mandatory informational return for residents of Spain holding crypto on foreign platforms where the combined value exceeds €50,000 on 31 December. We handle this filing so you meet the reporting duty the tax authority imposes.

Conventional accountants rarely know the technical complexity of blockchain (DeFi, swaps, bridges). colvence is an independent specialist firm that combines advanced technology with specialist tax advice on digital assets, which is not something a general practice can offer.

Yes. Unused capital losses from the last four tax years can be used to reduce the taxable base of your current gains. Our team reviews your history to optimise your tax bill so you do not pay a euro more than you legally owe.

Airdrops and staking are generally taxed as capital gains or as investment income within the savings tax base. Because of the technical complexity, classifying each movement correctly is what makes the outcome accurate and consistent with the authority’s criteria.

Security is our priority. We only need CSV files or read-only API access to extract your transaction history. We never need withdrawal permissions or access to your private keys. Everything is handled under strict confidentiality protocols.

You can file a supplementary return to regularise your position before the tax authority contacts you. We guide you through this voluntary regularisation to minimise surcharges and bring your tax history up to date.

The Spanish filing season usually opens in April, but we recommend commissioning your report as early as possible to avoid the last-minute rush. A well-prepared report takes real analysis time, especially for portfolios with DeFi activity or several exchanges.