A portal where you drop PDFs is not online accounting. Here is what real-time changes, what Luxembourg still requires, and who this model suits.
In short. An online accountant in Luxembourg is not a website where you upload invoices as PDFs and get them booked three months later. It is bookkeeping kept inside a tool connected to your bank and your invoicing, up to date continuously, that you can check whenever you want. Luxembourg's rules are the same online as on paper: the standard chart of accounts PCN 2020, VAT filing on eCDF, a FAIA audit file on request, and ten-year record keeping. At Advena, this real-time bookkeeping starts from €325 per month, all included.
"Online accountant", "digital accounting firm", "fully paperless books": the labels multiply, and they do not all mean the same thing. Two very different realities hide behind the same word, and one of them brings you almost nothing. Here is how to tell them apart, what Luxembourg still requires whatever the channel, and who online accounting genuinely suits.
What is an online accountant in Luxembourg?
An online accountant keeps a company's books remotely, in a browser-based tool, with no binders to hand over and no mandatory appointment to drop off documents. The director sends paperwork digitally and can view the accounts at any time. In Luxembourg, this way of working changes none of the legal obligations: it only changes how information flows and when it comes back to you.
That last point is the only one that truly matters. The rest is convenience.
The real divide: drop-box portal or real-time bookkeeping
Most so-called "online" offers are really drop-box portals. You upload your invoices to a clean interface, a receipt confirmation appears, and you feel modern. But behind the screen, the cycle has not moved: someone books your documents later, and you discover your result the following spring. You have simply swapped the envelope for a drag-and-drop.
Real-time bookkeeping runs on a different mechanism. It is not your PDFs that feed the accounts, it is your flows. Your bank is connected and posts its transactions every day. Your supplier invoices are read and pre-booked as soon as they arrive. Your customer invoicing generates the entries directly. The result: at any moment, your books reflect today's position, not the closed year's.
| Criterion | "Online" drop-box portal | Real-time bookkeeping |
|---|---|---|
| What you send | PDFs to upload | Nothing: your flows feed the accounts on their own |
| Freshness of figures | The result next spring | Your position this month |
| What the information is for | Recording, once the year is over | Deciding, while you can still act |
| Double entry | Common between your tool and the firm | None, a single system |
The question to ask a firm that calls itself "online" fits in one sentence: can I see this month's result without calling you? If the answer is no, you have a portal, not real time.
Online does not mean outside Luxembourg's rules
This is the most expensive misunderstanding. Moving your books online waives no local obligation, and an attractive but foreign tool can quietly put you in a difficult spot. Four requirements stay fully in force.
The standard chart of accounts first. Your books must follow the PCN 2020, set by the Grand-Ducal regulation of 12 September 2019 and applicable to financial years opened since 1 January 2020. An online tool that lets you invent your own accounts is not compliant, only flexible, as we explain in our guide to the standard chart of accounts in Luxembourg.
Then VAT. Returns are filed on the eCDF platform, at the right frequency and in the right format, a topic we cover in our article on VAT returns in Luxembourg. A VAT summary you can read on screen is not the same as a compliant eCDF filing.
Finally the FAIA file. In a tax audit, the Registration Duties Authority can request a compliant FAIA audit file, and many generic online tools cannot produce one. On top of that, records must be kept for ten years, including after your subscription ends. Software that cuts off access when you leave hands you a legal obligation with none of the data to meet it. We summarised these checks in our article on choosing accounting software in Luxembourg.
Wondering whether your current "online" tool is really compliant in Luxembourg? We check it with you, no jargon.
Have your books reviewedWhere your data lives, and why it matters
Online bookkeeping lives on servers. Knowing where, and under which jurisdiction, is not a technical detail for a Luxembourg company. Your entries, bank statements and supporting documents are sensitive data, subject to retention and confidentiality duties. Knowing which country stores them, who can access them and how you get them back the day you leave belongs to the questions you ask before signing, not after.
This is a point where consumer-grade offers often stay vague. Controlled hosting with clear reversibility beats a polished interface that will not tell you where it keeps your accounts.
What real time actually changes for a director
Take an ordinary situation. It is September, a client offers you a large contract but you need to hire to deliver it. With classic bookkeeping, you will only know your real margin for the year next spring: you decide blind. With real-time bookkeeping, your cash forecast, your margin by activity and your order book sit in the same system, viewable the same day.
This is not a technological feat, it is the result of a tool wired correctly. Bank flows arrive on their own through bank synchronisation. Supplier invoices are read by automatic recognition on receipt. And you steer on a financial dashboard that shows today, not last quarter.
The Advena difference: the firm keeps the books inside your tool
Most "online" firms work in their own software, separate from yours. You run the business on one side, they book on the other, and someone bridges the gap each month by export or re-entry. We chose to remove that bridge. We deploy your Odoo, set up for the PCN 2020, Luxembourg VAT and the FAIA export, then we keep your books inside it. One system, no double entry, a single version of the truth.
No classic accounting firm touches your management tool, and no integrator keeps your books. That coupling is our difference, described on the tool side in our Odoo in Luxembourg for SMEs hub and on the service side in our guide to accounting firms in Luxembourg. The fixed fee starts from €325 per month, all included: day-to-day bookkeeping, VAT and eCDF filing, annual accounts and filing with the trade register, payroll, a monthly review with a dedicated manager, a monthly report and permanent access to your books in real time. Nothing is billed outside the monthly fee.
Who online accounting does not suit
Let us be plain. Real time is useless if you do not intend to use it. If your only need is to drop a box of invoices once a year at the lowest price, you will pay for a freshness of information you will never touch. If you are a complex multi-jurisdiction holding with transfer-pricing questions, or if your document volumes are far out of the ordinary, your need calls for a specialist setup, not an online fixed fee. Our ground is the Luxembourg SME of 1 to 50 employees that wants to stop flying blind. We will tell you at the first exchange if that is not you.
Want online accounting that gives you your figures while they can still shape a decision? Let's talk.
Talk about your bookkeepingFrequently asked questions
Is an online accountant valid in Luxembourg?
Yes, provided it meets the same obligations as a classic firm: the standard chart of accounts PCN 2020, VAT filing on eCDF, the ability to produce a FAIA file in an audit, and ten-year record keeping. The online channel waives none of these rules.
What is the difference between online accounting and real-time bookkeeping?
Online accounting often comes down to a portal where you drop PDFs that are booked later. Real-time bookkeeping is fed by your bank flows and invoices continuously, so your accounts reflect the current month's position, not the closed year's.
Is my accounting data safe online?
It depends on the hosting. Ask where your data is stored, under which jurisdiction, who can access it and in what format you retrieve it if you cancel. Clear reversibility and controlled hosting matter as much as the interface.
Do I need to install software to work with an online accountant?
No. At Advena, the books are kept in a browser-based Odoo set up for Luxembourg, and the tool is included in the fixed fee. There is nothing to install, and you view your accounts online whenever you wish.
How much does an online accountant cost in Luxembourg?
Prices are rarely published on the market. The Advena fixed fee starts from €325 per month, all included, with no hourly billing and no extras outside the monthly fee. It is an entry point, reassessed beyond a certain volume or complexity, but always stated in advance.
Read more
- Accounting firm in Luxembourg: the complete guide for an SME
- What an accounting firm costs in Luxembourg: fixed fee, hourly rates and hidden extras
- Choosing accounting software in Luxembourg
- Outsourcing your accounting in Luxembourg: when, why, how much
- Financial dashboards in Odoo: steering your SME in real time
Why Advena?
We are the only Luxembourg accounting firm that keeps your books inside the management tool it deployed for you. Your flows feed the accounts continuously, you read your position in real time, and the fixed fee starts from €325 per month, all included, with no surprise invoice. We inform you of the rules, we do not replace tailored advice, and we tell you plainly when our model is not right for you.
Tell us where you stand, we'll tell you what it costs. No phantom quote.
Talk about your case
