Mandatory data in an invoice

In most countries, for an invoice to be valid, it must include the following information:

  • Numeration

  • Date

  • Tax data of the issuer

  • Tax data of the customer

  • Concepts

  • Tax rate

  • Additional information for some types of companies

  • Other requirements may be necessary in your country. If someone is not included in the software, contact us and we will include it.

Below we will detail these concepts and we will show you how you can do it in a very simple way.


It is one of the most important elements of the invoice, since all must be numbered following a correlative numbering.

It's common to make numbering errors if invoices are made manually using an invoice template or invoice type document.

Using Gespet, you can define the invoice number you want and from this all invoices you generate will automatically have the correlative numbering (1,2,3 ...).

This way you do not make mistakes when you have to manually number each invoice.


The date you make the invoice. If you use Gespet software, the software automatically fills in the date when you are generating the invoice.


It is necessary to include the tax information of both the issuer (yours) and the receiver (the customer).

Using Gespet, you do not need to write your data every time you issue an invoice. Just fill in the data in the Settings option and these are automatically loaded each time you generate an invoice.

The fiscal data that an invoice must include are:

  • Name or name of the company

  • Tax identification number

  • Tax Residence

  • Zip code (optional)

  • Country


Detail of the products or services. Each one is expressed in a different line indicating the price and the number of units.


Details of applicable taxes. If, for example, in your country there are different types or percentages of taxes depending on the product/service you sell, the invoice includes a breakdown of the tax bases, the total and the different types or percentages of taxes.


Certain companies must indicate complementary information on the invoices (registration, certificate, etc.).

Using Gespet, you do not need to write this information every time you issue an invoice. Just fill in the data in the Settings option and these are automatically loaded each time you generate an invoice.

Using Gespet is very simple and fast:

The Numeration

It's automatically filled

The date of emission

It's automatically filled

The customer

Select it and the data is automatically filled

The concepts and prices

Select it and the data is automatically filled

The number of units

It's calculated automatically

The tax rate

It's automatically filled

The data of the issuer (your data)

It's automatically filled

Additional information for companies

It's automatically filled

The veterinary collegiate number, ...

It's automatically filled

(For tax exempt invoices) Explanatory text on the reason for tax exemption

It's automatically filled

  • You set the number you want and automatically each time you make a new invoice, the invoice number appears filled so that all invoices are correctly numbered.

  • The issue date is also automatically filled in

  • If the customer is new, add it and Gespet will remember it for the next time. If the client was already registered in your database, only selected.

  • The concepts and prices are already configured, so you only have to select the corresponding one. The units are calculated the units (for example 8 days / nights of stay).

  • The tax rate is automatically calculated because it is already configured for that service or product

  • The ustomer's data and your data are filled automatically.

  • You can configure an informative text that will appear only on tax-exempt invoices

You can also configure additional information that will automatically appear on all invoices.

You can print the invoice or send it by email to the customer automatically.

Invoices can be expressed in foreign languages and currencies. You can issue the invoice in any language or language and in any currency or currency with some exceptions. For example, an exception are the invoices where VAT is charged, in which the VAT rate must appear expressed in the € (Euro) currency.

If you have doubts about your particular case, we recommend that you always consult a professional or the corresponding administration so that they can help you resolve all these doubts and you can bill correctly.

We remind you that in some countries, invoices issued cannot be deleted or modified, because the legislation does not allow this procedure.

If you have selected any of these countries when configuring your data: To comply with the law, the software will not allow you to delete invoices. If you have made a mistake when making an invoice, it's not possible to simply delete that invoice and create a new one or modify it. It will offer you the option to cancel that invoice and you will be able to generate a new one.

If this limitation does not exist in your country, you can delete the invoice if you need it and generate it again.

As you know, the invoices must include the taxes corresponding to your activity/country. Check what is the type of tax that you must include in your invoices and if there are cases in which they are exempt from taxes. The software allows you to issue the invoice including taxes or excluding them, to adapt to these two situations.

In the tax-exempt invoices, it is convenient to indicate the reason why it is exempt from taxes. You can do this by including a note on the invoice. For example, in Europe, if it is an intracommunity transaction that meets the requirements to be exempt from VAT, it is best to indicate this on the invoice.

In the software, you can configure this information in the Option: Settings > Company data > Invoice text without taxes and it will appear on all the invoices you issue tax-exempt.

The tax-exempt invoice does not legally require a different numbering than the ordinary invoices, so when you issue a tax-exempt invoice, it will have the same numbering as the ordinary ones.

Recommendation: This is general advice, but the legislation varies from country to country. If you have questions about billing, applicable taxes, exceptions, etc. We recommend that you always consult a professional or the corresponding administration so that they can help you resolve all these doubts and you can make your billing correctly.

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