E-invoicing from 2027: what small businesses should be doing today

For many small business owners, mandatory e-invoicing feels like a distant 2027 problem. In practice it can reach you much sooner, because under the amended Accounting Act a buyer who has registered as an e-invoice recipient in the Business Register can already require the seller to issue an e-invoice. One larger customer making that request is enough to bring the obligation into a one-person company. The good news is that the switch is rarely an expensive IT project. Most small businesses can sort it out with their existing accounting software and a single agreement with an operator. This article looks at what an e-invoice actually is, who the obligation affects, and what is worth setting up this month.

What an e-invoice actually is

An e-invoice is a machine-readable data file that the buyer's accounting software reads in without human help. A PDF is a picture of an invoice meant for a person. The bookkeeper has to type the figures from the PDF into the software by hand, or rely on the software to recognise them from the image. With an e-invoice, the amounts, dates and invoice lines move straight from one system to another, and there is less scope for error. This is where the most common misunderstanding comes in. Many business owners assume that a PDF attached to an email is an e-invoice. It is not. A PDF is an image; an e-invoice is a data set. If a customer asks you for an e-invoice, a smarter-looking PDF or a better-worded email will not help. They are waiting for a file their software can read without anyone touching it. Technically, an e-invoice travels either through the Peppol network or via an operator. It is based on the European e-invoicing standard and the Estonian e-invoice description, but as a business owner you do not need to study the standard itself. Your software or operator formats the invoice correctly for you. There is also a record of the invoice being sent and received, which cuts down arguments about whether it ever arrived.

Who the e-invoicing obligation affects

In Estonia, e-invoicing has been required for invoices to the public sector for years. You cannot send a paper invoice or a PDF to a state body. The amendment to the Accounting Act extends the same logic to invoicing between private companies. A buyer who has registered as an e-invoice recipient in the Business Register can require the seller to issue an e-invoice, and the seller must comply. There is a separate marker for this in the Business Register, and every company can change its own entry. That leads to an important conclusion. The obligation does not depend on the size of your business. It arises from the relationship with the buyer. A single customer's request brings e-invoicing into a one-person company that sends five invoices a month. Finland follows similar logic. Public sector invoices move as e-invoices, and a buyer can also require e-invoices in business-to-business trade. If your customers are in Finland, it is safe to assume the question will reach you sooner rather than later. The European Union's ViDA package is moving towards making e-invoicing and digital reporting mandatory for cross-border transactions by the end of this decade. Member states may introduce domestic requirements earlier. So 2027 is better read as the latest deadline rather than the first date on which this concerns you.

Three ways to send e-invoices

A small business has three sensible routes to sending e-invoices. All three work at low invoice volumes and none of them requires buying new software.

• your existing accounting software, with e-invoicing switched on
• an operator service that connects your software to the e-invoicing network
• an operator or Business Register web interface where you create the invoice by hand

Software plus an operator

Most Estonian and Finnish cloud accounting packages either include e-invoicing already or offer it as a separate module. In most cases you do not need a new system. Typically you sign an agreement with an operator, enter the required details in your software settings, and from then on choose e-invoice instead of PDF when sending. The technical side stays between the software and the operator. Your workflow barely changes, because you prepare the invoice exactly as before.

A web interface without software

If you do not use accounting software, you can create and send e-invoices through an operator's own web interface or via the Business Register service. You enter the invoice details into a form and the system formats them correctly. At low volumes this works perfectly well. Once you are issuing more than twenty or so invoices a month, manual entry becomes tedious and it is worth considering proper software.

What sending e-invoices costs

Operators usually sell a model with a monthly fee plus a per-invoice charge for each one sent. The exact price depends on the package, your invoice volume and whether you need sending only or receiving as well. At low volumes the monthly cost is usually small, but you will only get a firm figure from a quote, because prices vary between operators. Before signing, it is worth putting a few quotes side by side and checking what is missing from each. Some operators charge separately for setting up the connection; others include a set number of invoices in the monthly fee. Compare the total annual cost, not just the monthly fee. There is an indirect gain too. E-invoicing reduces manual entry, typing errors and disputes about whether an invoice arrived. If your bookkeeper bills by the hour, less manual work may also reduce your bookkeeping bill. That gain is hard to measure precisely in advance, but invoice processing time is easy enough to count before and after the switch.

What to set up today

The move can be broken into small steps that fit comfortably into a single month. None of them requires a separate IT project or a large budget.

• check the Business Register marker, both for your own company and for your larger customers
• review your accounting software settings, as e-invoicing may already be available there
• request quotes from a couple of operators and compare the total annual cost
• send one test e-invoice to a friendly customer or partner
• agree with your bookkeeper how e-invoices will flow from now on

The most important step is the first test send, because it exposes setup errors before a real customer sees them. Once the first e-invoice arrives, the rest is routine. If a step gets stuck, it usually means your software package needs upgrading or your choice of operator needs a second look. That way you will not be rushing in 2027, or scrambling for a solution the moment a customer asks. The obligation will arrive, and you will already be ready for it.

If you would like a second opinion before deciding, our prices are published openly, and you can write to us on the contact and free audit page. We will look together at where your invoicing stands today and what the simplest route to e-invoicing looks like.