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E-invoicing in Estonia: simple, fast and free

Your client expects an e-invoice? With Sliptree you can create one and send it for free.

Create a Sliptree account, verify your identity and turn on e-invoicing. Then send invoices to Estonian clients, or abroad through the Peppol network.

  • No accounting software or e-invoice operator contract needed
  • No technical knowledge or complex setup
  • Send e-invoices to Estonian and international clients
  • Up to 10 invoices a year and 5 customers for free

Start with a 14-day free trial. After that, stay on the free plan or pick a paid plan that fits your invoice volume.

Create a free account

No credit card needed

Sending through Peppol requires the recipient to be reachable on Peppol

Invoicing software screenshot showcasing invoice list

Easier than you think

How to send an e-invoice with Sliptree

Create an account, verify your identity and send the invoice in a few clicks.

That is all there is to it.

1. Create a free account

Sign up your business with Sliptree. For secure use, verify yourself with Smart-ID, Mobile-ID or an ID card. E-residents can use their e-Residency card or Smart-ID.

2. We check your right to represent

We check the business register to confirm that you can represent the company. This way only authorised people can send e-invoices on behalf of your business.

3. Turn on e-invoicing

We set up the connections needed for sending e-invoices automatically. No need to find an e-invoice operator or go through a complex setup.

4. Create the invoice in minutes

Add the customer, products or services, prices and due date. Company search fills in customer details from the business registers of 7 countries (Estonia, Latvia, Lithuania, Finland, Sweden, Norway, Belgium).

5. Send the e-invoice

Confirm the invoice, click Send invoice and choose E-invoice. For Estonian clients, Sliptree shows in the same view whether the client accepts e-invoices.

6. Follow the invoice history

All sent invoices are in one view. See whether the client has opened the invoice and set its status. Filter invoices and export them when you need to.

Why businesses choose Sliptree

Everything you need to send e-invoices in one place. Less manual work, less setup and more time for real work.

E-invoicing is included in the free plan

Create and send e-invoices in the same place

No separate contract with an e-invoice operator

Supports both Estonian e-invoicing and the international Peppol network

Create estimates, credit notes and recurring invoices too

If an e-invoice cannot be sent, send the same invoice as a PDF

More than e-invoicing

Sliptree brings the main invoicing tools together in one place: well-designed invoices, estimates, recurring invoices, payment reminders, a customer register and more.

Professional invoices

Send professional, good-looking invoices that you can design to match your brand.

Estimates

Create an estimate and send it to the client. Once the client accepts it, turn it into an invoice right away.

Credit notes

Create a credit note directly from an existing invoice.

Payment reminders

See at a glance which invoices are unpaid and send a reminder quickly.

Customer register

All customers and contact details in one place, so the next invoice is quicker to create.

Multiple users

With the Unlimited plan, share the company account with colleagues or your accountant and manage their access with roles.

Incredible ❤️ Everything looks so good - there's nothing to complain about 😁 You have made the program really convenient and user-friendly – stylish and easy to use! Thank you for making my life easier ❤️❤️❤️ I am so happy with how caring and respectful you are towards your clients 🙏

Salim Imanov
CEO of TripleTrade OÜ

The beauty of Sliptree is that it's very easy to learn. We've never needed a training and even personally customised it for our company when invoicing our clients. Plus, for a global digital company likes ours, sending invoices in multiple languages is a nice touch.

David Bailey.
David Bailey
CEO of Blu Mint

Simple, fair pricing

Get started with a 14-day free trial. No credit card required.

Get 2 months for free when paying annually!

Free

Perfect for getting started with invoicing.

Free

Start free trial
  • 10 invoices / year
  • 5 customers
  • 1 team member
  • E-invoicing *

Starter

For freelancers and small businesses who need more.

EUR + VAT

Start free trial
  • 30 invoices / year
  • 25 customers
  • 1 team member
  • E-invoicing *
Popular

Unlimited

For growing businesses that need everything.

EUR + VAT

Start free trial
  • Unlimited invoices
  • Unlimited customers
  • Unlimited team members
  • E-invoicing *

* Available in selected countries

14-day free trial, after which account limited until you subscribe.

What is an e-invoice?

An e-invoice (e-arve in Estonian) is a machine-readable electronic invoice. The invoice data is structured, usually as an XML file, and the e-invoice goes straight into the recipient's accounting software.

An e-invoice is not the same as a PDF invoice sent by email. Both can hold the same data, but the recipient's software handles them differently: a PDF has to be entered by hand, an e-invoice is processed automatically.

For more on how e-invoicing works in Estonia and what changed in 2025, read our guide "E-invoice in Estonia: How It Works and What Changed in 2025".

Clear benefits

Why e-invoicing pays off

E-invoicing cuts repeated data entry and makes the whole invoicing process faster and easier.

Lower accounting costs

Invoice data moves between systems automatically and nobody has to type it in again. This saves your accountant's time and the cost that comes with it.

Fewer mistakes

Automatic data exchange helps avoid wrong amounts, wrong reference numbers and other errors from manual entry.

Faster invoice processing

The data arrives straight in the recipient's accounting software, so the invoice is checked, approved and sent for payment sooner.

Safer delivery

An e-invoice travels through the operator network straight into the recipient's system, not as an email attachment. This lowers the risk of sending to the wrong address and of fake invoices.

Better for the environment

Fewer PDF files, fewer emails and less data. A smaller footprint.

In line with Estonian rules

E-invoices have been required for the public sector since 2019. Since 1 July 2025, any company registered as an e-invoice recipient in the business register can ask its suppliers for e-invoices, unless agreed otherwise.

When do you need to send e-invoices?

Not every business has to use e-invoices, but they are becoming more common.

Estonian public sector institutions have required e-invoices since 2019. Since 1 July 2025, any company registered as an e-invoice recipient in the Estonian business register can ask the seller for an e-invoice. If you have not agreed on another format, such as a PDF, you need to send an e-invoice.

The Ministry of Finance has proposed making e-invoices mandatory between VAT-registered businesses from 2027. This is a proposal, not law yet: the final scope and date depend on parliament.

Because e-invoices are faster to process and can be automated, many companies already prefer to receive only e-invoices from their suppliers.

Who is Sliptree for?

Sliptree is built for businesses that want invoicing to be as simple as possible.

It works well for:

  • freelancers

  • private limited companies (OÜ)

  • e-residents running an Estonian company

  • small and growing businesses

  • businesses that send both PDF invoices and e-invoices

  • businesses that invoice clients in Estonia and abroad

Whether you send five invoices a month or five hundred, the goal is the same: less manual work, fewer mistakes and faster invoicing.

Sending e-invoices abroad

With Sliptree you send e-invoices through the Estonian operator network to Estonian recipients, and through the Peppol network to foreign clients who accept Peppol BIS 3.0 e-invoices.

For example, an Estonian company can send an e-invoice to a client in Finland, Latvia or Lithuania, as long as that recipient is reachable on Peppol. Confirm with a foreign client how they receive invoices and which recipient details they need before you send.

To learn more about Peppol, read our guide "What is Peppol? A practical guide for freelancers and small businesses".

Setting up your business to send e-invoices

To send e-invoices, a business usually has to choose and register with an e-invoice operator.

With a Sliptree account, you do not need to know how an operator works, which formats are used or how to set up your company in the registers.

Open Business settings → E-invoicing and follow the setup. Sliptree takes you through identity verification, the representation rights check and turning on e-invoicing in a few clicks.

We then register our partner Billberry as your e-invoice operator. You do not need a separate operator contract, and you can turn e-invoicing off at any time.

For the full walkthrough, see the e-invoicing setup guide.

Secure and reliable e-invoicing

Invoices carry important business data, so the whole process has to be secure.

Sliptree uses strong authentication with Smart-ID, Mobile-ID or an ID card, and checks your right to represent the company before turning on e-invoicing.

E-residents can verify with their e-Residency digital ID card, which works in Estonian e-services the same way as the ID card, or with a Smart-ID account created with that card. See the Police and Border Guard Board FAQ and ID.ee.

E-invoices travel in a standard format straight into the recipient's system, which cuts manual handling and the mistakes that come with it.

Frequently asked questions

If you have a question that is not answered here, email us and we will reply as soon as we can.
Can I send e-invoices for free?

Yes. On the free plan you can create and send up to 10 invoices a year and manage up to 5 customers. That covers both e-invoices and PDF invoices. You can try everything in Sliptree free and without limits for 14 days.

Is e-invoicing secure?

Yes. Sending an e-invoice is usually safer than emailing an invoice. The e-invoice travels through the operator network straight into the recipient's system, not as an email attachment, which lowers the risk of sending to the wrong address and of fake invoices.

Do I need a contract with an e-invoice operator?

No. Sliptree does the setup for you, with no extra fees.

Can I send both e-invoices and PDF invoices?

Yes, Sliptree handles both in the same place. If the client does not accept e-invoices, send the same invoice as a PDF.

How do I know whether my client accepts e-invoices?

For Estonian companies, Sliptree checks the business register automatically to see whether the recipient accepts e-invoices. You can also look this up yourself for free in the e-Business Register or on inforegister.ee. For clients abroad, ask them for their Peppol details.

Can I receive e-invoices with Sliptree?

Not at the moment. Sliptree focuses on making it as simple as possible to send invoices and e-invoices.

How do I know the e-invoice arrived?

Sliptree shows the full history of each invoice, from creation to payment. When you send an e-invoice, an entry appears in the history. If sending fails, we notify you.

Can I import or export data?

Yes. Import your products and customers from a CSV file, and export your data and invoice history at any time.

Can I add users?

With the Unlimited plan you can add colleagues or your accountant and give them suitable roles and permissions. The Free and Starter plans have one user.

Ask away!

Need help with e-invoicing? Get in touch!

If you have any questions, write to us at [email protected].
We reply quickly and know what we are talking about.

Send your first e-invoice today

Want to see how simple it is to send an e-invoice with Sliptree? Try it yourself.

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