Electronic invoicing program for self-employed and SMEs.

Online electronic invoicing. Wherever you are

Issue electronic invoices easily with Contasimple. Create electronic invoices anytime, anywhere. Access them from the web and Android and iOS mobile app.

What is an electronic invoice?

An electronic invoice is an invoice that is issued and received in electronic format. Electronic invoicing is therefore a legal alternative to traditional paper invoicing.

How to create an electronic invoice.

Issue a new invoice

Home page

In the "Accounting" tab of the Contasimple homepage, click "Issue a new invoice".

Invoice number

The electronic invoice number will be created automatically in a correlative manner and in chronological order. You can set your serial number as you wish by clicking "Set up invoice".

Invoice number

Invoice series

Invoice series

If you use multiple series of invoices, select or create your own series. By default, you have already created the series of normal invoices and corrective invoices.

Learn more about invoice series.


Date of issue of the electronic invoice. By default, the program will show today. You can change the date through the drop-down calendar.

Invoice data

Due date

Due date

Date on which the invoice payment expires. By default, the program will display the 30-day due date. You can also select the 60-day, 90-day, no-date option, or put the date you want through the drop-down calendar.

Income type

Contasimple uses the simplified General Accounting Plan.

Is your invoice for the sale of merchandise? You don't have to change anything.
Do you invoice a service? Choose the option “705. Provision of services ” of the drop-down menu.

Other options: For example, if you are issuing a rental invoice, select the option "752. Lease income".

Income type

Customer invoice


Select your customer from the drop-down list. If you haven't already created it in your database, click "New customer". You only have to select it next time.

Private notes

You can write the private notes that you want. These notes will not appear on the invoice.

Private notes incoice

Type retention


In the event that an invoice is subject to personal income tax retention, you can choose the percentage from the drop-down list.

Notes on the invoice

If you want to add notes to your electronic invoice, you can create them by clicking "Manage note information".

Very useful, for example, to add the bank account where you want your customer to make the payment, or to add any other information you want to appear on your invoice. Next time, just select it from the drop-down list.

Notes on the invoice

Mark the invoice as paid

Mark the invoice as paid

By clicking on the "Mark invoice as paid" option, you can select the day on which the payment was made and the payment method used. You can create new payment methods by clicking on "New method".

External services

If you wish, you can sync your Google Drive or Dropbox account with Contasimple so that your invoice is automatically uploaded to your external cloud.

Upload invoice to cloud

Advanced options invoice

Advanced options

In "advanced options" you will find other options related to the VAT tax: whether the invoice is an export, among others.


You can type the concept of the product or service, or select it from your catalog by clicking the cursor on the left.
The price, discount and VAT rate will be imported automatically.

More information on the catalog of products and services.

Concept invoice

Add another concept

Add another line

Click "Add another line" to create a new concept line.

Tax base

Unit price of the product or service without taxes. If you select your product or service from your catalog, it will be imported automatically.

Tax base concept

Quantity producte


Number of units, hours, kg, liters, km… In your catalog you can configure the type of unit for each of your products or services.

Discount percentage

You can set discounts on a specific product or service in your catalog, or add it manually.

Discount  invoice

VAT invoice


You can set the VAT rate in your catalog, or select it from the drop-down list.


If you have selected a personal income tax retention, it will be automatically calculated.

Retention invoice

Show advanced edition

Show advanced edition

Click "Show advanced edition" if you want to add a detailed description of some or all of the items on your invoice.

Detailed description

Easily add a description for some or all of your lines by clicking on the box below each one.

Detailed description

Insert invoice

Insert invoice

Once you've entered all the details, click "insert invoice".

Take control of your invoices easily

On the Issued invoices registry page, you will find a summary of all your registered invoices. They will be organized by quarters with all the relevant information: number, date, status, customer, tax base, VAT, retention, total and you will also find a menu with different options.

Within the menu, you can easily manage all your invoices:

More invoicing options

From your Issued invoices registry you will find more options for your invoice. To the right of each row where your invoice is located is a series of icons:

  • Edit Invoice: You can modify your invoice as long as you have not yet sent it to your customer or declared it to the Inland Revenue.
More options of invoices

More options invoices
  • Create invoice per copy: To create a new invoice using another one as a a reference.
  • Manage Invoice collections: Learn more in the next section.
  • Attach files to the invoice.
  • Pay by receipt.
  • Export or print to pdf.
  • Export in FacturaE format.
  • Generate rectifying invoice.
  • Send invoice.
  • Delete the invoice.

Manage invoice collections

If you did not mark the invoice as paid at the time of issue, it will be registered with the status "Pending". That is, it is pending collection.

To mark your invoice as collected once it has been issued, click on "Manage invoice collections" in the currency icon to the right of the same row on the invoice.

A new window will open where the total invoice will appear as the amount paid by default. If it is a partial payment, change the amount manually. In this case, the status will change to "Incomplete" upon registration.

More options of invoices

More options of invoices

By default, the program will set the payment date as today. You can change it by selecting the day in the calendar.

You can create your own collection methods to appear in a drop-down menu by clicking "New Method".

Once you have filled in the details, click on "Register".

When you return to your issued invoice registry, you will see that the status of the invoice has changed to "Complete" if the collection was for the full amount of the invoice.


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Contasimple is a product of Grupo Primavera, a Cegid Company    Calle Labastida 10, 28034 Madrid, CIF B67119594, T 932 933 806
Contasimple S.L.U. is a company registered in the Mercantile Registry of Barcelona in volume 46203, folio 76, sheet B-512849, inscription 1.