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Free invoicing software for e-commerce

Create free invoices to bill your services in just 10 seconds. Manage your accounting. Time tracking tool to help you calculate your billable hours.

Manage your e-commerce easily with an online software.

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Create your invoices in just 10 seconds.

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Manage your accounting easily.

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Time tracker to calculate your billable hours.

Invoicing, estimates, accounting and taxes for your e-commerce

Manage your e-commerce wherever you are.

Choose an online software that allows you to manage your e-commerce wherever you are. From your computer in your office and also from your Smartphone or Tablet. All you need to just focus on what really matters: your customers.


Create your invoices for e-commerce in just 10 seconds. Customize them with your logo and send them to your customers automatically.

How to create invoices for e-commerce

More about invoices

Electronic signature

Integrity, authenticity and non-repudiation guaranteed.

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Prestashop integration

Invoicing module for Prestashop. Synchronize both sold goods and customers automatically.

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WooCommerce integration

Invoicing plugin for WooCommerce. Synchronize both sold goods and customers automatically.

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Cloud storage

Cloud storage to manage your files from the cloud. Integration with Google Drive and Dropbox.

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Create your estimates in just 10 seconds. Create an invoice from an estimate with just 1 click.

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Delivery notes

Your delivery notes for material delivery in 10 seconds.

More about delivery notes

Remittances and bank receipts

Remittances and bank receipts for recurring payments.

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Everything you need to manage your business easily. With Contasimple you save time so you can dedicate yourself to what really matters: your work.

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Simple Customer and supplier management.

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Income and expenses management

With our visual dashboards you will be able to control your finances intuitively.

More about income and expenses management

Physical POS

Physical POS for card payments.

Global vision

Global vision of your financial status at any time.

Collections and payments

Export all the information about your collections and payments.

Informes de empresa

¿Vas a realizar una compra de gran importe a un proveedor anticipando tú el dinero? Asegúrate primero de que tu cliente es solvente consultando un informe de solvencia desde Contasimple.

Time tracking tool

Time tracking tool to help you calculate your billable hours. Also to control the working hours of your employees.

More about our time tracker

Easily download

Easily download the worked hours reports with all the inserted comments.

Presentación telemática

Exporta los ficheros de los modelos de la AEAT para subirlos digitalmente y hacer tu presentación telemáticamente.

Más información sobre presentación telemática

Contasimple app

Time tracker usable from Contasimple app too.


If you have any doubt, you can always contact us by email, Facebook, Twitter or Linkedin. It will be a pleasure to assist you. Our team are experts in helping small business owners and self-employeds with their billing and accounting issues.

More about support

How to create e-commerce invoices

Our sales invoice templates create a unique invoice reference number automatically to comply with legal requirements. Your legal information and the one from your client will appear automatically once you have registered your customer in the program. Remember to modify the invoice date in case you are issuing the invoice in a different day from the one the purchase took place. Add the due date and terms of payment too.

Simplified invoices and tickets

When you are just giving to your customers a receipt or ticket, for example from your cash register, you can keep control of your accounting using Contasimple by creating a single daily invoice. If you are selling goods which have different VAT rates, separate them by each type of VAT rate or each different tax.

In order to be able to do that, first create a fictitious customer called “Multiple Customers” as follows:

1. Go to “Configuration” :

Various clients made Contasimple step 1

2. Company Setting, Taxes:

Various clients made Contasimple step 2

3. Go to “Invoices to unidentified customers” and click on the button “Create customer Multiple customers”:

Various clients made Contasimple step 3

4. Once you have created your “Multiple customers”, you will be able to select it when you create your daily invoice:

Various clients made Contasimple step 4

Concepts that your e-commerce invoice should include

Describe the sold goods in detail. Record each one as a different concept, also indicating the units sold for each concept. Record the net amount and the program will calculate the total automatically. Add the percentage of taxes if required.

If you have created a sales invoice for a specific customer using Contasimple, for example because he asked for it, remember not to include its amount in your single daily invoice created with your fictitious “Multiple customers”.

Indicate the delivery terms and make clear who pays the shipping costs

If the shipping costs are borne by the customer, include them in the tax base so that the corresponding fees are calculated.

Sales invoices to third countries

Be clear about the custom frees and the requirements that are required to be able to sell in the country in question. Remember that you must keep the documents that prove the exit of the merchandise from the territory of application of the tax.

How do I create my e-commerce invoice in Contasimple?

The online sales invoice model that you can see above is an example of an e-commerce that sells to an individual. You can create it like this from Contasimple. In this example, the customer has paid by credit card at the time of ordering online and we have recorded it by means of a note:

Create Ecommerce Invoice

How do I create a new collection method?

By default, "Cash" will appear. If you want to add a new collection method, click on "New method", give it a title on "Method name", and select the "Type of method". Enter the card number or checking account, or only the last 4 digits.

ECommerce payment method

These are the different types of methods you can choose:
Card, Entry / Transfer, Bank Receipt, Promissory Note / Check and Pay Pal.

ECommerce collection method

How can I create a new note to be selected on the invoice?

To create a new note, click on "Manage note information", write a title for the new note, write the text that should appear in the invoice and click on "Insert":

ECommerce invoice note

Which invoice template should I choose?

Contasimple has multiple invoice templates with different designs. If you don’t want the quantity column to appear in your invoice, just choose some template called "Services". If you would like the quantity column to appear to add the number of hours worked, choose any template but "Services" ones.

How can I apply a discount rate?

You have two options: whether to apply a discount rate for a specific customer, or apply a discount rate only for some invoice concepts.

When you create a customer, you can set a discount rate for them to apply to all concepts of your invoices. The subtotal of the invoice net amount will decrease accordingly:

Customer discount on ECommerce invoice

If you wish to apply a discount rate in one or some of the concepts of your invoice, just add the number of the percentage in the "% Discount" column. The subtotal of the net amount will decrease proportionally:

ECommerce invoice discount concept

How to add a detailed description of each concept

If you would like to add a detailed description of each concept, just click on "Show advanced edition". A new text field will appear below each concept.

Detailed discount concept in ECommerce invoice

Bill your customers from the Contasimple Billing App

Contasimple's App is designed to make your daily tasks even easier.

  • Create invoices, delivery notes and register your tickets.

  • Check your schedule of customers and suppliers.

  • View all your virtual disk documents.

  • Certified digitization of invoices.

  • Time tracking also from the app.

Available for Android and iOS. Totally free!

App to make free invoices

What are you waiting for?

Not a Contasimple user yet?

Contasimple - The invoicing, accounting and taxes application on the cloud.


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