Form 721 AEAT:
Anonymous and error-free

Generate your 2023 Form 721 just in one click


The consultancy Nubel Fiscal" save time with AutoDeclaro

Form 721:
Anonymous and error-free

Generate your 721 model
in one click


Consultancy Nubel Fiscal" saves time with Self-declared

Tired of spending long hours filling in your actions on AEAT form 721?
Are you afraid of being sanctioned by the Tax Agency for providing incomplete or erroneous data?
Do you pay high fees for consultancies and agencies to do it for you?


THE DEFINITIVE SOLUTION FOR generating your 721 form




Auto 721 automates the completion of Tax Form 721 error-free and 100% anonymous.

Online web tool.

Valid for major exchanges such as Binance, Coinbase, Kucoin, bit2me, bitbank, bitfinex, biflyer, bitforex, bithumb, bitopro, bitpanda pro, Bitstamp, Bittrex,, Coincheck, CoinEx, Coinfalcon,, Gemini, Huobi, Kraken,, Okcoin and Poloniex, among others..

If you work with Koinly or CoinTrackingyou can use their balance.

In addition, we provide a Excel template for virtual currencies deposited in unsupported exchanges and generate form 721 automatically.

Anonymous. We just need an email address to send you the document.

Extracts from your exchanges They do NOT contain personal data (DNI, name or postal address).

Compatible with the web programme of the Tax Agency (AEAT), Provincial Council of Gipuzkoa and Álava, y Treasury of Navarre.

Compatible with the BILA Platform of the Provincial Council of Bizkaia (BILA Platform).

Simple instructions and support throughout the process.

What is the AEAT Form 721?


The 721 is an information declaration form for virtual currencies or cryptocurrencies located abroad that is mandatory if you have a value of more than 50,000 euros.

Due to the strict penalty regime applicable, in the event of non-compliance with this new reporting obligation, or of providing incorrect or incomplete data, it is essential to submit your form duly completed in order to avoid penalties.

When did Form 721 come into force?

With the innovations and new additions in terms of payment methods and virtual currencies, tax form 721 came into force the day after publication in the Official State Gazette (BOE) on 29 July 2023.

When must Form 721 be filed with the Inland Revenue?

The deadline for file form 721 to the Tax Agency will be open for the first time in 2024. Specifically, from 1 January to 31 March of the same year.

How does Auto Model 721 work?

Below are instructions on how to get your Form 721 completed automatically.


There is two options to obtain your 721:

a) Extracts of virtual currencies from supported exchanges

b) Through template Excel (if you use unsupported exchanges)

a) Cryptocurrency exchanges' cryptocurrency statements
deposited abroad

Download the information of your exchanges in CSV. See how to download your cryptoassets from your exchange.

Exchanges supported (Coming soon):

  • Binance
  • Coinbase
  • Kucoin
  • Kraken
  • Bit2me
  • Bitbank
  • Bitfinex
  • Bitflyer
  • Bitforex
  • Bithumb
  • Bitpro
  • Poloniex
  • Koinly
  • Bitpanda pro
  • Bitstamp
  • Okcoin
  • Bittrex
  • Coincheck
  • CoinEx
  • Coinfalcon
  • Gemini
  • Huobi
  • Cointracking

If your exchange is not among the supported ones, you can create your own extract through a Excel template

b) Excel Template

We provide a Excel template standardised where you can enter all your virtual currencies / cryptocurrencies deposited abroad:


You can group several extracts together of both options in a ZIP compressed file.


Attached are the extracts of exchanges in CSV, Excel or ZIP format (if you want to group several extracts) during the purchasing process.

All files you provide are validated before payment is made.

3. DOWNLOAD YOUR FORM and file it with the tax authorities

Obtain Form 721 generated with BOE" format ready to be imported into the web programme of the Tax Agency, Provincial Councils of Gipuzkoa, Bizkaia, Alava and Navarra Tax Officeat the end of the purchase process.

Your TAX FORM MODELO 721 will be sent to the email address you provide during the checkout process along with the import instructions.

We remind you that throughout the process your personal details remain anonymous, as they do not appear in the statements you provide us with, nor in the final document that is generated.

Full breakdown of benefits


Valid for the Tax Agency AEAT, Treasury of Navarre and Provincial Councils of Gipuzkoa, Bizkaia and Alava

Automatic import of extracts from supported exchanges

Comparison with the last filing of Form 721. Calculation of previously declared or extinct values (origin of the asset).

Validation of files prior to purchase

Conversion of all amounts a Euro

Calculation of the percentage share for more than one headline

Multiple extracts from different exchanges (Coinbase, Binance,...)

We support software such as Koinly or CoinTracking

Support and help throughout the process

For more information technical details and instructions see product description Auto-721 (Coming soon)

We have the trust of our customers ❤️





Are you a tax attorney or tax adviser? Contact us

Build customer loyalty

Build customer loyalty by providing great results thanks to error-free and totally accurate tax models.

Save time

Get the completed Spanish agency models in a few minutes. Save time and dedicate it to what is really important: customer advice.

Increase your profit

Maximize your profit margin thanks to the low cost of automating farm models.

Save time and optimise your processes, as other industry leaders are already doing.. We collaborate with:

The fiscal cloud

José Manuel Gómez, Founding CEO of the tax consultancy "La Nube Fiscal". has allowed us to be more agile when it comes to making:

Income, Modelo 210, Modelo 720, Modelo 721 of our clients.

As well as being fast, it is accurate and therefore adds a lot of value to our work.

Logo Leire Roldan

Leire Roldán, CEO and founder of the tax consultancy "Leire Roldán".

Thanks to Autodeclaro, we have all the complete and detailed information available in the Modelo 720.

It also supports all the farms in the Basque Country and Navarre.


Gestoría online "TaxScouts".

Our tax advisors are more productive in the completion and completion of tax returns. statement of income.

What our customers say

Form 721 frequently asked questions

What is Auto 721?
Auto 721 is a web tool that automatically and anonymously fills in the Form 721. Clear and concise instructions.
When am I obliged to file Form 721?

In case of exceeding the 50.000€ (at the Euro exchange rate), a declaration on form 721 will have to be filed.

Form 721 deadline
The deadline for filing Form 721 is from 1 January to 31 March 2024.

Can I test "Auto 721" before paying?
Yes, you can test the tool for free "Auto 721" soon and learn first-hand how to fill in Form 721 automatically.
How long does it take to generate the completed Form 721?
Follow the instructions that will be detailed shortly and obtain the exchange statement, and once you have it, attach it at the end of the purchase to generate your 721 model. The result is available at the end of the purchase and is also sent to the email address you indicate during the purchase process.
How can you assure me that Auto 721 is totally anonymous?
The purchase process is completely anonymous as only an email address is required to receive the completed Form 721. In addition, no personal data is required in the exchanges statements or excel template that you provide to generate the Form 721.
Which exchanges/files/input extracts can I use to generate the Model 721?
You can generate the form 721 by following the instructions that will be provided soon to obtain the statements in CSV format of the exchanges. Binance, Coinbase, Kucoin, bitbank, bitfinex, biflyer, bit2me, bitforex, bithumb, btopro, bitpanda pro, Bitstamp, Bittrex,, Coincheck, CoinEx, Coinfalcon,, Gemini, Huobi, Kraken,, Okcoin and Poloniex, among others. And software such as Koinly or Cointracking..

You can also provide an excel template if you use other exchanges.

What is the rate applied for conversion?
The balances of each type of virtual currency as at 31 December expressed in virtual currency units and their valuation in euro. In this case, in order to carry out the valuation in euro, obliged entities shall take the quotation as at 31 December offered by the main trading platforms or price-tracking websites or, failing that, provide a reasonable estimate of the market value of the virtual currency in euro. In this respect, the quote or value used to make such a valuation shall be indicated.
I am a tax resident in Gipuzkoa, Vizcaya or Alava. Do I have to file Form 721 with the Tax Agency or with the Provincial Council of Gipuzkoa, Bizkaia or Araba?
You have to file Form 721 with the Provincial Council that corresponds to your tax residence.

I am a tax resident in Navarre. Do I have to file Form 721 with the tax authorities of Navarre or with the Tax Agency?
Before the tax authorities of Navarre
More information at
Who files the electronic filing of the Form 721 generated by "Auto 721"?
You are responsible for filing form 721 through the web tool of the corresponding Tax Agency or regional tax office.

What are the accepted payment methods?
Visa, MasterCard and American Express debit and credit card through Stripe. Stripe is also used as a payment method by Google, Amazon,, Uber and many others. What is Stripe?

You can also pay with Paypal and Bizum.

What is the return policy?
We do not offer a refund policy once the form 721 has been generated.

However, if there are errors in the completion, incomplete or corrupt information from the files provided, rectification or refund may be requested. Contact us at if applicable.

How much does it cost?
You can see the price soon here
Is Autodeclaro compatible with Mac?
It is compatible with Mac as it does not require any software to be installed. You can generate the Model 721 from any internet browser.
More frequently asked questions
More frequently asked questions can be found in the service description. Auto-721 coming soon.


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